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42745070 | 10.1007/JHEP09(2016)167 | In light of the latest neutrino oscillation data, we examine whether the
leptonic flavor mixing matrix can take on an exact form of tri-bimaximal (TBM),
golden-ratio (GR) or bimaximal (BM) mixing pattern at a superhigh-energy scale,
where such a mixing pattern could be realized by a flavor symmetry, and become
compatible with experimental data at the low-energy scale. Within the framework
of the Minimal Supersymmetric Standard Model (MSSM), the only hope for
realizing such a possibility is to count on the corrections from the
renomalization-group (RG) running. In this work we focus on these radiative
corrections, and fully explore the allowed parameter space for each of these
mixing patterns. We find that when the upper bound on the sum of neutrino
masses $\Sigma^{}_\nu \equiv m^{}_1 + m^{}_2 + m^{}_3 < 0.23~\text{eV}$ at the
$95\%$ confidence level from Planck 2015 is taken into account, none of these
mixing patterns can be identified as the leptonic mixing matrix below the
seesaw threshold. If this cosmological upper bound on the sum of neutrino
masses were relaxed, the TBM and GR mixing patterns would still be compatible
with the latest neutrino oscillation data at the $3\sigma$ level, but not at
the $1\sigma$ level. Even in this case, no such a possibility exists for the BM
mixing.Comment: 22 pages, 5 figures; minor changes, references added, version to
appear in JHE | Viability of exact tri-bimaximal, golden-ratio and bimaximal mixing
patterns and renormalization-group running effects | viability of exact tri-bimaximal, golden-ratio and bimaximal mixing patterns and renormalization-group running effects | latest oscillation examine leptonic flavor bimaximal golden bimaximal superhigh realized flavor compatible scale. supersymmetric mssm hope realizing count renomalization running. radiative explore patterns. sigma equiv confidence planck none leptonic seesaw threshold. cosmological relaxed compatible latest oscillation sigma sigma level. pages minor | non_dup | [] |
42748244 | 10.1007/JHEP09(2016)168 | We present the supersymmetric extension of the recently constructed
E$_{8(8)}$ exceptional field theory -- the manifestly U-duality covariant
formulation of the untruncated ten- and eleven-dimensional supergravities. This
theory is formulated on a (3+248) dimensional spacetime (modulo section
constraint) in which the extended coordinates transform in the adjoint
representation of E$_{8(8)}$. All bosonic fields are E$_{8(8)}$ tensors and
transform under internal generalized diffeomorphisms. The fermions are tensors
under the generalized Lorentz group SO(1,2)$\times$SO(16), where SO(16) is the
maximal compact subgroup of E$_{8(8)}$. Vanishing generalized torsion
determines the corresponding spin connections to the extent they are required
to formulate the field equations and supersymmetry transformation laws. We
determine the supersymmetry transformations for all bosonic and fermionic
fields such that they consistently close into generalized diffeomorphisms. In
particular, the covariantly constrained gauge vectors of E$_{8(8)}$ exceptional
field theory combine with the standard supergravity fields into a single
supermultiplet. We give the complete extended Lagrangian and show its
invariance under supersymmetry. Upon solution of the section constraint the
theory reduces to full D=11 or type IIB supergravity.Comment: 25 page | E$_{8(8)}$ Exceptional Field Theory: Geometry, Fermions and
Supersymmetry | e$_{8(8)}$ exceptional field theory: geometry, fermions and supersymmetry | supersymmetric exceptional manifestly duality covariant formulation untruncated eleven supergravities. formulated spacetime modulo transform adjoint bosonic tensors transform diffeomorphisms. fermions tensors lorentz maximal subgroup vanishing torsion determines connections formulate supersymmetry laws. supersymmetry transformations bosonic fermionic consistently diffeomorphisms. covariantly constrained exceptional combine supergravity supermultiplet. lagrangian invariance supersymmetry. reduces | non_dup | [] |
42697962 | 10.1007/JHEP09(2016)169 | We consider RG flows obtained by a relevant deformation from unitary and
compact two-dimensional (0,2) SCFTs. We point out that an N=2 super-Kac-Moody
algebra present in the UV is preserved by the flow and does not mix with the
R-current. On the other hand, a direct sum of N=2 algebras in the UV theory
leads to a few complications in determining the IR R-symmetry; nevertheless, in
flows without accidental IR symmetries, we determine the IR R-symmetry and show
that it maximizes the IR central charge.Comment: 10 pages; v2 minor revisio | Relevant deformations and c-extremization | relevant deformations and c-extremization | flows deformation unitary scfts. super moody preserved current. algebras complications determining nevertheless flows accidental symmetries maximizes pages minor revisio | non_dup | [] |
73349101 | 10.1007/JHEP09(2016)171 | In this paper we extend our techniques, developed in a previous paper (Du,
etc, JHEP 05(2016)086) for direct evaluation of arbitrary $n$-point tree-level
MHV amplitudes in 4d Yang-Mills and gravity theory using the Cachazo-He-Yuan
(CHY) formalism, to the 4d Einstein-Yang-Mills (EYM) theory. Any single-trace
color-ordered $n$-point tree-level MHV amplitude in EYM theory, obtained by a
direct evaluation of the CHY formula, is of an elegant factorized form of a
Parke-Taylor factor and a Hodges determinant, much simpler and more compact
than the existing formulas in the literature. We prove that our new expression
is equivalent to the conjectured Selivanov-Bern-De Freitas-Wong (SBDW) formula,
with the help of a new theorem showing that the SBDW generating function has a
graph theory interpretation. Together with Ref. (Du, etc, JHEP 05(2016)086), we
provide strong analytic evidence for hidden simplicity in quantum field theory.Comment: 26 pages, 1 figure; v2: some typo corrected, more references added,
published versio | Direct Evaluation of $n$-point single-trace MHV amplitudes in 4d
Einstein-Yang-Mills theory using the CHY Formalism | direct evaluation of $n$-point single-trace mhv amplitudes in 4d einstein-yang-mills theory using the chy formalism | extend jhep amplitudes mills cachazo yuan formalism einstein mills theory. trace ordered elegant factorized parke taylor hodges determinant simpler formulas literature. conjectured selivanov bern freitas wong sbdw sbdw generating interpretation. ref. jhep analytic hidden simplicity pages typo corrected versio | non_dup | [] |
42640828 | 10.1007/JHEP09(2016)172 | We consider the one-dimensional massive Thirring model formulated on the
lattice with staggered fermions and an auxiliary compact vector (link) field,
which is exactly solvable and shows a phase transition with increasing the
chemical potential of fermion number: the crossover at a finite temperature and
the first order transition at zero temperature. We complexify its
path-integration on Lefschetz thimbles and examine its phase transition by
hybrid Monte Carlo simulations on the single dominant thimble. We observe a
discrepancy between the numerical and exact results in the crossover region for
small inverse coupling $\beta$ and/or large lattice size $L$, while they are in
good agreement at the lower and higher density regions. We also observe that
the discrepancy persists in the continuum limit keeping the temperature finite
and it becomes more significant toward the low-temperature limit. This
numerical result is consistent with our analytical study of the model's thimble
structure. And these results imply that the contributions of subdominant
thimbles should be summed up in order to reproduce the first order transition
in the low-temperature limit.Comment: 15 pages, 10 figures. The revised version of the manuscript. v4:
Corrected a simple bug in implementing the HMC algorithm and replaced
fig.4-10. Our main conclusions remain unchanged. Erratum published in JHE | Monte Carlo study of Lefschetz thimble structure in one-dimensional
Thirring model at finite density | monte carlo study of lefschetz thimble structure in one-dimensional thirring model at finite density | massive thirring formulated staggered fermions auxiliary solvable fermion crossover temperature. complexify lefschetz thimbles examine hybrid monte carlo thimble. discrepancy crossover beta regions. discrepancy persists continuum keeping toward limit. thimble structure. imply subdominant thimbles summed reproduce pages figures. revised manuscript. corrected implementing replaced fig. unchanged. erratum | non_dup | [] |
83860173 | 10.1007/JHEP09(2017)001 | The Ward identities involving the currents associated to the spontaneously
broken scale and special conformal transformations are derived and used to
determine, through linear order in the two soft-dilaton momenta, the
double-soft behavior of scattering amplitudes involving two soft dilatons and
any number of other particles. It turns out that the double-soft behavior is
equivalent to performing two single-soft limits one after the other. We confirm
the new double-soft theorem perturbatively at tree-level in a $D$-dimensional
conformal field theory model, as well as nonperturbatively by using the
"gravity dual'' of ${\cal{N}}=4$ super Yang-Mills on the Coulomb branch; i.e.
the Dirac-Born-Infeld action on AdS${}_5 \times S^5$.Comment: 48 pages, one appendi | Double-soft behavior of the dilaton of spontaneously broken conformal
invariance | double-soft behavior of the dilaton of spontaneously broken conformal invariance | ward identities involving currents spontaneously broken conformal transformations dilaton momenta amplitudes involving dilatons particles. turns performing other. confirm perturbatively conformal nonperturbatively super mills coulomb branch i.e. dirac born infeld .comment pages appendi | non_dup | [] |
83854624 | 10.1007/JHEP09(2017)002 | We derive new representations of the Einstein-Hilbert action in which
graviton perturbation theory is immensely simplified. To accomplish this, we
recast the Einstein-Hilbert action as a theory of purely cubic interactions
among gravitons and a single auxiliary field. The corresponding equations of
motion are the Einstein field equations rewritten as two coupled first-order
differential equations. Since all Feynman diagrams are cubic, we are able to
derive new off-shell recursion relations for tree-level graviton scattering
amplitudes. With a judicious choice of gauge fixing, we then construct an
especially compact form for the Einstein-Hilbert action in which all graviton
interactions are simply proportional to the graviton kinetic term. Our results
apply to graviton perturbations about an arbitrary curved background spacetime.Comment: 20 pages, 1 figur | Hidden Simplicity of the Gravity Action | hidden simplicity of the gravity action | derive representations einstein hilbert graviton perturbation immensely simplified. accomplish recast einstein hilbert purely cubic gravitons auxiliary field. einstein rewritten equations. feynman diagrams cubic derive recursion graviton amplitudes. judicious fixing einstein hilbert graviton graviton term. graviton perturbations curved pages figur | non_dup | [] |
84329565 | 10.1007/JHEP09(2017)003 | We investigate the butterfly effect and charge diffusion near the quantum
phase transition in holographic approach. We argue that their criticality is
controlled by the holographic scaling geometry with deformations induced by a
relevant operator at finite temperature. Specifically, in the quantum critical
region controlled by a single fixed point, the butterfly velocity decreases
when deviating from the critical point. While, in the non-critical region, the
behavior of the butterfly velocity depends on the specific phase at low
temperature. Moreover, in the holographic Berezinskii-Kosterlitz-Thouless
transition, the universal behavior of the butterfly velocity is absent.
Finally, the tendency of our holographic results matches with the numerical
results of Bose-Hubbard model. A comparison between our result and that in the
$O(N)$ nonlinear sigma model is also given.Comment: 41 pages, 7 figures, minor revisions, refs adde | Holographic Butterfly Effect and Diffusion in Quantum Critical Region | holographic butterfly effect and diffusion in quantum critical region | butterfly holographic approach. argue criticality holographic deformations temperature. butterfly deviating point. butterfly temperature. holographic berezinskii kosterlitz thouless universal butterfly absent. tendency holographic matches bose hubbard model. sigma pages minor revisions refs adde | non_dup | [] |
84090692 | 10.1007/JHEP09(2017)004 | The chiral magnetic and vortical effects denote the generation of
dissipationless currents due to magnetic fields or rotation. They can be
studied in holographic models with Chern-Simons couplings dual to anomalies in
field theory. We study a holographic model with translation symmetry breaking
based on linear massless scalar field backgrounds. We compute the electric DC
conductivity and find that it can vanish for certain values of the translation
symmetry breaking couplings. Then we compute the chiral magnetic and chiral
vortical conductivities. They are completely independent of the holographic
disorder couplings and take the usual values in terms of chemical potential and
temperature. To arrive at this result we suggest a new definition of
energy-momentum tensor in presence of the gravitational Chern-Simons coupling.Comment: 12 pages,v2: ref. adde | Anomalous transport and holographic momentum relaxation | anomalous transport and holographic momentum relaxation | chiral vortical dissipationless currents rotation. holographic chern simons couplings anomalies theory. holographic translation breaking massless backgrounds. conductivity vanish translation breaking couplings. chiral chiral vortical conductivities. holographic disorder couplings usual temperature. arrive gravitational chern simons pages ref. adde | non_dup | [] |
83849107 | 10.1007/JHEP09(2017)005 | We consider a simple extension of the minimal left-right symmetric model
(LRSM) in order to explain the PeV neutrino events seen at the IceCube
experiment from a heavy decaying dark matter. The dark matter sector is
composed of two fermions: one at PeV scale and the other at TeV scale such that
the heavier one can decay into the lighter one and two neutrinos. The gauge
annihilation cross sections of PeV dark matter are not large enough to generate
its relic abundance within the observed limit. We include a pair of real scalar
triplets $\Omega_{L,R}$ which can bring the thermally overproduced PeV dark
matter abundance into the observed range through late time decay and consequent
entropy release thereby providing a consistent way to obtain the correct relic
abundance without violating the unitarity bound on dark matter mass. Another
scalar field, a bitriplet under left-right gauge group is added to assist the
heavier dark matter decay. The presence of an approximate global $U(1)_X$
symmetry can naturally explain the origin of tiny couplings required for
long-lived nature of these decaying particles. We also show, how such an
extended LRSM can be incorporated within a non-supersymmetric $SO(10)$ model
where the gauge coupling unification at a very high scale naturally accommodate
a PeV scale intermediate symmetry, required to explain the PeV events at
IceCube.Comment: 33 pages, 9 figures, 4 tables; error in relic density calculation
fixed and discussion expanded for better clarity; matches published versio | Multi-component Fermionic Dark Matter and IceCube PeV scale Neutrinos in
Left-Right Model with Gauge Unification | multi-component fermionic dark matter and icecube pev scale neutrinos in left-right model with gauge unification | lrsm icecube decaying matter. composed fermions heavier lighter neutrinos. annihilation relic abundance limit. triplets omega bring thermally overproduced abundance consequent thereby relic abundance violating unitarity mass. bitriplet assist heavier decay. approximate naturally tiny couplings lived decaying particles. lrsm incorporated supersymmetric unification naturally accommodate pages tables relic expanded clarity matches versio | non_dup | [] |
42733183 | 10.1007/JHEP09(2017)006 | We construct solutions to the Einstein equations for asymptotically locally
Anti-de Sitter spacetimes with four, five, and six dimensional
Reissner-Nordstr\"om boundary metrics. These spacetimes are gravitational duals
to "jammed" CFTs on those backgrounds at infinite N and strong coupling. For
these spacetimes, we calculate the boundary stress tensor as well as compute
entanglement entropies for ball shaped regions as functions of the boundary
black hole temperature $T_{BH}$. From this, we see how the CFT prevents heat
flow from the black hole to the vacuum at spatial infinity. We also compute
entanglement entropies for a three dimensional boundary black hole using the
AdS C-metric. We compare our results to previous work done in similar
spacetimes.Comment: 42 pages, 11 figures, version to appear in JHE | Entanglement Entropy in Jammed CFTs | entanglement entropy in jammed cfts | einstein asymptotically locally sitter spacetimes reissner nordstr metrics. spacetimes gravitational duals jammed cfts backgrounds infinite coupling. spacetimes entanglement entropies ball shaped prevents infinity. entanglement entropies metric. pages | non_dup | [] |
83866255 | 10.1007/JHEP09(2017)007 | We formulate point-particle effective field theory (PPEFT) for relativistic
spin-half fermions interacting with a massive, charged finite-sized source
using a first-quantized effective field theory for the heavy compact object and
a second-quantized language for the lighter fermion with which it interacts.
This description shows how to determine the near-source boundary condition for
the Dirac field in terms of the relevant physical properties of the source, and
reduces to the standard choices in the limit of a point source. Using a
first-quantized effective description is appropriate when the compact object is
sufficiently heavy, and is simpler than (though equivalent to) the effective
theory that treats the compact source in a second-quantized way. As an
application we use the PPEFT to parameterize the leading energy shift for the
bound energy levels due to finite-sized source effects in a model-independent
way, allowing these effects to be fit in precision measurements. Besides
capturing finite-source-size effects, the PPEFT treatment also efficiently
captures how other short-distance source interactions can shift bound-state
energy levels, such as due to vacuum polarization (through the Uehling
potential) or strong interactions for Coulomb bound states of hadrons, or any
hypothetical new short-range forces sourced by nuclei.Comment: 29 pages plus appendices, 3 figure | Point-Particle Effective Field Theory III: Relativistic Fermions and the
Dirac Equation | point-particle effective field theory iii: relativistic fermions and the dirac equation | formulate ppeft relativistic fermions interacting massive sized quantized quantized lighter fermion interacts. dirac reduces choices source. quantized sufficiently simpler treats quantized way. ppeft parameterize sized allowing precision measurements. besides capturing ppeft efficiently captures uehling coulomb hadrons hypothetical forces sourced pages appendices | non_dup | [] |
83833294 | 10.1007/JHEP09(2017)008 | Acting with non-Abelian T-duality on the $S^3$ inside the $AdS_5$ subspace of
$AdS_5\times S^5$ with $N$ units of flux, we generate a new half-BPS solution
with $SU(2|4)$ symmetry that belongs to the Lin-Lunin-Maldacena class of
geometries. The analysis of the asymptotics, quantised charges and probe branes
in this geometry suggests an interpretation as the gravity dual to the
Berenstein-Maldacena-Nastase Plane Wave Matrix Model, in a particular vacuum
associated to a partition of $N$, in which the multiplicity of each $SU(2)$
irreducible representation is equal to its dimension. This vacuum is
interpreted in M-theory in terms of giant gravitons backreacting in the
maximally supersymmetric pp-wave geometry. Consistently with this, we show that
the non-Abelian T-dual solution exactly agrees with the Penrose limit of the
superstar solution in $AdS_7\times S^4$. This suggests an interesting global
completion of the non-Abelian T-dual solution in terms of an M5-brane geometry.Comment: 28 pages, discussion in section 5.1 improved, results unchanged,
reference added. Matches published versio | BMN Vacua, Superstars and Non-Abelian T-duality | bmn vacua, superstars and non-abelian t-duality | acting abelian duality subspace belongs lunin maldacena geometries. asymptotics quantised charges branes berenstein maldacena nastase partition multiplicity irreducible dimension. interpreted giant gravitons backreacting maximally supersymmetric geometry. consistently abelian agrees penrose superstar completion abelian brane pages unchanged added. matches versio | non_dup | [] |
83867860 | 10.1007/JHEP09(2017)009 | Correlators in conformal field theory are naturally organized as a sum over
conformal blocks. In holographic theories, this sum must reorganize into a path
integral over bulk fields and geometries. We explore how these two sums are
related in the case of a point particle moving in the background of a 3d
collapsing black hole. The conformal block expansion is recast as a sum over
paths of the first-quantized particle moving in the bulk geometry. Off-shell
worldlines of the particle correspond to subdominant contributions in the
Euclidean conformal block expansion, but these same operators must be included
in order to correctly reproduce complex saddles in the Lorentzian theory.
During thermalization, a complex saddle dominates under certain circumstances;
in this case, the CFT correlator is not given by the Virasoro identity block in
any channel, but can be recovered by summing heavy operators. This effectively
converts the conformal block expansion in CFT from a sum over intermediate
states to a sum over channels that mimics the bulk path integral.Comment: 23 pages, 8 figure | From Conformal Blocks to Path Integrals in the Vaidya Geometry | from conformal blocks to path integrals in the vaidya geometry | correlators conformal naturally organized conformal blocks. holographic reorganize geometries. explore sums moving collapsing hole. conformal recast paths quantized moving geometry. worldlines subdominant euclidean conformal correctly reproduce saddles lorentzian theory. thermalization saddle dominates circumstances correlator virasoro recovered summing operators. effectively converts conformal mimics pages | non_dup | [] |
83850407 | 10.1007/JHEP09(2017)010 | The LHCb measurement of the $\mu/e$ ratio $R_{K^*}$ indicates a deficit with
respect to the Standard Model prediction, supporting earlier hints of lepton
universality violation observed in the $R_K$ ratio. We show that the $R_K$ and
$R_{K^*}$ ratios alone constrain the chiralities of the states contributing to
these anomalies, and we find deviations from the Standard Model at the
$4\sigma$ level. This conclusion is further corroborated by hints in the
theoretically challenging $b\to s\mu^+\mu^-$ distributions. Theoretical
interpretations in terms of $Z'$, lepto-quarks, loop mediators, and composite
dynamics are discussed. We highlight their distinctive features in terms of
chiralities and flavour structure relevant for the observed anomalies.Comment: 31 pages, 8 figures. References adde | Flavour anomalies after the $R_{K^*}$ measurement | flavour anomalies after the $r_{k^*}$ measurement | lhcb deficit supporting hints lepton universality violation ratio. constrain chiralities contributing anomalies deviations sigma level. corroborated hints theoretically challenging distributions. interpretations lepto quarks mediators composite discussed. highlight distinctive chiralities flavour pages figures. adde | non_dup | [] |
84328177 | 10.1007/JHEP09(2017)011 | Motivated by the close connection of tensor models to the SYK model, we use
representation theory to construct the complete set of gauge invariant
observables for bosonic and fermionic tensor models. Correlation functions of
the gauge invariant operators in the free theory are computed exactly. The
gauge invariant operators close a ring. The structure constants of the ring are
described explicitly. Finally, we construct a collective field theory
description of the bosonic tensor model.Comment: 32+1 pages; v2: refs added, minor typos corrected. v3: matches JHEP
versio | Gauge Invariants, Correlators and Holography in Bosonic and Fermionic
Tensor Models | gauge invariants, correlators and holography in bosonic and fermionic tensor models | motivated connection observables bosonic fermionic models. exactly. ring. explicitly. collective bosonic pages refs minor typos corrected. matches jhep versio | non_dup | [] |
83842025 | 10.1007/JHEP09(2017)013 | We consider two different conformal field theories with central charge
c=7/10. One is the diagonal invariant minimal model in which all fields have
integer spins; the other is the local fermionic theory with superconformal
symmetry in which fields can have half-integer spin. We construct new conformal
(but not topological or factorised) defects in the minimal model. We do this by
first constructing defects in the fermionic model as boundary conditions in a
fermionic theory of central charge c=7/5, using the folding trick as first
proposed by Gang and Yamaguchi. We then acting on these with interface defects
to find the new conformal defects. As part of the construction, we find the
topological defects in the fermionic theory and the interfaces between the
fermionic theory and the minimal model. We also consider the simpler case of
defects in the theory of a single free fermion and interface defects between
the Ising model and a single fermion as a prelude to calculations in the
tri-critical Ising model.Comment: 54 pages, 5 figures, version as accepted for publication with minor
change | Defects in the Tri-critical Ising model | defects in the tri-critical ising model | conformal diagonal integer spins fermionic superconformal integer spin. conformal topological factorised defects model. constructing defects fermionic fermionic folding trick gang yamaguchi. acting defects conformal defects. topological defects fermionic interfaces fermionic model. simpler defects fermion defects ising fermion prelude ising pages publication minor | non_dup | [] |
83847302 | 10.1007/JHEP09(2017)014 | Precision study of electroweak symmetry breaking strongly motivates the
construction of a lepton collider with center-of-mass energy of at least 240
GeV. Besides Higgsstrahlung ($e^+e^- \to hZ$), such a collider would measure
weak boson pair production ($e^+e^- \to WW$) with an astonishing precision. The
weak-boson-fusion production process ($e^+e^- \to \nu \bar{\nu} h$) provides an
increasingly powerful handle at higher center-of-mass energies. High energies
also benefit the associated top-Higgs production ($e^+e^-\to t\bar th$) that is
crucial to constrain directly the top Yukawa coupling. The impact and
complementarity of differential measurements, at different center-of-mass
energies and for several beam polarization configurations, are studied in a
global effective-field-theory framework. We define a "global determinant
parameter" (GDP) which characterizes the overall strengthening of constraints
independently of the choice of operator basis. The reach of the CEPC, CLIC,
FCC-ee, and ILC designs is assessed.Comment: 55 pages, lots of figures, v2: references added, minor corrections,
extended discussions on quadratic EFT contributions and beam polarization
effects, matches published version in JHE | The leptonic future of the Higgs | the leptonic future of the higgs | precision electroweak breaking motivates lepton collider gev. besides higgsstrahlung collider boson astonishing precision. boson fusion increasingly powerful handle energies. benefit crucial constrain yukawa coupling. complementarity configurations framework. determinant characterizes strengthening independently basis. cepc clic designs pages lots minor discussions quadratic matches | non_dup | [] |
84092997 | 10.1007/JHEP09(2017)015 | Using relativistic quantum mechanics, we study the spectrum of a non-BPS
two-particle bound state in the massive phase of $\mathcal{N}=4$ super
Yang-Mills, in the limit when one of the particles is infinitely heavier than
the other. We find that the spectrum shows the exact $n^2$ degeneracy for each
principal quantum number $n$, just as in the strict non-relativistic limit.
This is in line with the findings of Caron-Huot and Henn, who studied the same
system in the large $N$ limit with the technique of integrability and the dual
conformal symmetry.Comment: 9 pages, 3 figure | On hydrogen-like bound states in $\mathcal{N}=4$ super Yang-Mills | on hydrogen-like bound states in $\mathcal{n}=4$ super yang-mills | relativistic mechanics massive mathcal super mills infinitely heavier other. degeneracy principal strict relativistic limit. caron huot henn integrability conformal pages | non_dup | [] |
83864390 | 10.1007/JHEP09(2017)016 | We examine the behavior of entanglement entropy of a subsystem $A$ in a fully
backreacted holographic model of a $1+1$ dimensional $p$ wave superconductor
across the phase transition. For a given temperature, the system goes to a
superconducting phase beyond a critical value of the charge density. The
entanglement entropy, considered as a function of the charge density at a given
temperature, has a cusp at the critical point. In addition, we find that there
are three different behaviors in the condensed phase, depending on the
subsystem size. For a subsystem size $l$ smaller than a critical size $l_{c1}$,
entanglement entropy continues to increase as a function of the charge density
as we cross the phase transition. When $l$ lies between $l_{c1}$ and another
critical size $l_{c2}$ the entanglement entropy displays a non-monotonic
behavior, while for $l > l_{c2}$ it decreases monotonically. At large charge
densities entanglement entropy appears to saturate. The non-monotonic behavior
leads to a novel phase diagram for this system.Comment: 16 pages, 17 figures, v2: references added, section 3.1 added, JHEP
styl | Holographic entanglement entropy of a $1+1$ dimensional $p$-wave
superconductor | holographic entanglement entropy of a $1+1$ dimensional $p$-wave superconductor | examine entanglement subsystem backreacted holographic superconductor transition. goes superconducting density. entanglement cusp point. behaviors condensed subsystem size. subsystem entanglement continues transition. lies entanglement displays monotonic monotonically. densities entanglement saturate. monotonic pages jhep styl | non_dup | [] |
83852177 | 10.1007/JHEP09(2017)017 | We show that the spectrum of the SYK model can be interpreted as that of a 3D
scalar coupled to gravity. The scalar has a mass which is at the
Breitenholer-Freedman bound of AdS$_2$, and subject to a delta function
potential at the center of the interval along the third direction. This,
through Kaluza-Klein procedure on AdS$_2 \times (S^1)/Z_2$, generates the
spectrum reproducing the bi-local propagator at strong coupling. Furthermore,
the leading $1/J$ correction calculated in this picture reproduces the known
correction to the poles of the SYK propagator, providing credence to a
conjecture that the bulk dual of this model can be interpreted as a three
dimensional theory.Comment: 19 pages; v2: further clarifications and references adde | Three Dimensional View of the SYK/AdS Duality | three dimensional view of the syk/ads duality | interpreted gravity. breitenholer freedman delta direction. kaluza klein generates reproducing propagator coupling. picture reproduces poles propagator credence conjecture interpreted pages clarifications adde | non_dup | [] |
83867512 | 10.1007/JHEP09(2017)018 | We present an approach to evaluate the full operatorial Q-system of all
$\mathfrak{u}(p,q|r+s)$-invariant spin chains with representations of
Jordan-Schwinger type. In particular, this includes the super spin chain of
planar $\mathcal{N}=4$ super Yang-Mills theory at one loop in the presence of a
diagonal twist. Our method is based on the oscillator construction of
Q-operators. The Q-operators are built as traces over Lax operators which are
degenerate solutions of the Yang-Baxter equation. For non-compact
representations these Lax operators may contain multiple infinite sums that
conceal the form of the resulting functions. We determine these infinite sums
and calculate the matrix elements of the lowest level Q-operators. Transforming
the Lax operators corresponding to the Q-operators into a representation
involving only finite sums allows us to take the supertrace and to obtain the
explicit form of the Q-operators in terms of finite matrices for a given magnon
sector. Imposing the functional relations, we then bootstrap the other
Q-operators from those of the lowest level. We exemplify this approach for
non-compact spin $-s$ spin chains and apply it to $\mathcal{N}=4$ SYM at the
one-loop level using the BMN vacuum as an example.Comment: 31 pages, v2: minor changes, version published in JHEP, v3: typo
fixe | Evaluation of the operatorial Q-system for non-compact super spin chains | evaluation of the operatorial q-system for non-compact super spin chains | operatorial mathfrak chains representations jordan schwinger type. super planar mathcal super mills diagonal twist. oscillator operators. built traces degenerate baxter equation. representations infinite sums conceal functions. infinite sums operators. transforming involving sums supertrace magnon sector. imposing bootstrap level. exemplify chains mathcal pages minor jhep typo fixe | non_dup | [] |
84094794 | 10.1007/JHEP09(2017)019 | Using the duality between color and kinematics, we construct two-loop
four-point scattering amplitudes in $\mathcal{N}=2$ super-Yang-Mills (SYM)
theory coupled to $N_f$ fundamental hypermultiplets. Our results are valid in
$D\le 6$ dimensions, where the upper bound corresponds to six-dimensional
chiral $\mathcal{N}=(1,0)$ SYM theory. By exploiting a close connection with
$\mathcal{N}=4$ SYM theory - and, equivalently, six-dimensional
$\mathcal{N}=(1,1)$ SYM theory - we find compact integrands with
four-dimensional external vectors in both the maximally-helicity-violating
(MHV) and all-chiral-vector sectors. Via the double-copy construction
corresponding $D$-dimensional half-maximal supergravity amplitudes with
external graviton multiplets are obtained in the MHV and all-chiral sectors.
Appropriately tuning $N_f$ enables us to consider both pure and matter-coupled
supergravity, with arbitrary numbers of vector multiplets in $D=4$. As a bonus,
we obtain the integrands of the genuinely six-dimensional supergravities with
$\mathcal{N}=(1,1)$ and $\mathcal{N}=(2,0)$ supersymmetry. Finally, we extract
the potential ultraviolet divergence of half-maximal supergravity in
$D=5-2\epsilon$ and show that it non-trivially cancels out as expected.Comment: 53 pages, 5 figures, 1 table + appendices, ancillary files; v2
published versio | Two-loop supersymmetric QCD and half-maximal supergravity amplitudes | two-loop supersymmetric qcd and half-maximal supergravity amplitudes | duality kinematics amplitudes mathcal super mills hypermultiplets. valid chiral mathcal theory. exploiting connection mathcal equivalently mathcal integrands maximally helicity violating chiral sectors. copy maximal supergravity amplitudes graviton multiplets chiral sectors. appropriately tuning enables supergravity multiplets bonus integrands genuinely supergravities mathcal mathcal supersymmetry. extract ultraviolet divergence maximal supergravity epsilon trivially cancels pages appendices ancillary files versio | non_dup | [] |
83832125 | 10.1007/JHEP09(2017)021 | In this paper, we provide a thorough study on the expansion of single trace
Einstein-Yang-Mills amplitudes into linear combination of color-ordered
Yang-Mills amplitudes, from various different perspectives. Using the gauge
invariance principle, we propose a recursive construction, where EYM amplitude
with any number of gravitons could be expanded into EYM amplitudes with less
number of gravitons. Through this construction, we can write down the complete
expansion of EYM amplitude in the basis of color-ordered Yang-Mills amplitudes.
As a byproduct, we are able to write down the polynomial form of BCJ numerator,
i.e., numerators satisfying the color-kinematic duality, for Yang-Mills
amplitude. After the discussion of gauge invariance, we move to the BCFW
on-shell recursion relation and discuss how the expansion can be understood
from the on-shell picture. Finally, we show how to interpret the expansion from
the aspect of KLT relation and the way of evaluating the expansion coefficients
efficiently.Comment: 50 pages, 1 figure, Revised versio | Expansion of Einstein-Yang-Mills Amplitude | expansion of einstein-yang-mills amplitude | thorough trace einstein mills amplitudes ordered mills amplitudes perspectives. invariance propose recursive gravitons expanded amplitudes gravitons. ordered mills amplitudes. byproduct numerator i.e. numerators satisfying kinematic duality mills amplitude. invariance move bcfw recursion understood picture. interpret aspect evaluating pages revised versio | non_dup | [] |
83860885 | 10.1007/JHEP09(2017)022 | We revisit the 1/2-BPS D-branes on the AdS$_5\times$S$^5$ background. Based
only on the classification of 1/2-BPS D-branes obtained by the covariant open
string description, we consider various purely static configurations of
D-branes without any worldvolume flux on the AdS$_5\times$S$^5$ background.
Under the covariant $\kappa$ symmetry fixing condition, we investigate which
part the spacetime supersymmetries is preserved on the D-brane worldvolume and
obtain the associated worldvolume supersymmetry transformation rules to leading
order in the worldvolume fluctuating fields. It is shown that, for purely
static configurations without any worldvolume flux, only the AdS type D-branes,
in which the AdS radial direction is one of worldvolume coordinates, are
1/2-BPS.Comment: 32 pages, reference adde | Notes on worldvolume supersymmetries for D-branes on AdS_5 X S^5
background | notes on worldvolume supersymmetries for d-branes on ads_5 x s^5 background | revisit branes background. branes covariant purely configurations branes worldvolume background. covariant kappa fixing spacetime supersymmetries preserved brane worldvolume worldvolume supersymmetry worldvolume fluctuating fields. purely configurations worldvolume branes worldvolume pages adde | non_dup | [] |
83837861 | 10.1007/JHEP09(2017)023 | The neutrino $\mu$-$\tau$ reflection symmetry has been attracting a lot of
attention as it predicts the interesting results $\theta^{}_{23} = \pi/4$ and
$\delta = \pm \pi/2$. But it is reasonable to consider breakings of such a
symmetry either from the theoretical considerations or on the basis of
experimental results. We thus perform a systematic study for the possible
symmetry-breaking patterns and their implications for the mixing parameters.
The general treatment is applied to some specific symmetry breaking arising
from the renormalization group effects for illustration.Comment: 18 pages, 6 figures, 5 tables, minor revision, accepted for
publication in JHE | Breakings of the neutrino mu-tau reflection symmetry | breakings of the neutrino mu-tau reflection symmetry | reflection attracting predicts theta delta reasonable breakings considerations results. breaking parameters. breaking arising renormalization pages tables minor revision publication | non_dup | [] |
84327165 | 10.1007/JHEP09(2017)024 | In this note we investigate Gra{\ss}mannian formulas for form factors of the
chiral part of the stress-tensor multiplet in $\mathcal{N}=4$ superconformal
Yang-Mills theory. We present an all-$n$ contour for the $G(3,n+2)$
Gra{\ss}mannian integral of NMHV form factors derived from on-shell diagrams
and the BCFW recursion relation. In addition, we study other $G(3,n+2)$
formulas obtained from the connected prescription introduced recently. We find
a recursive expression for all $n$ and study its properties. For $n \geq 6$,
our formula has the same recursive structure as its amplitude counterpart,
making its soft behaviour manifest. Finally, we explore the connection between
the two Gra{\ss}mannian formulations, using the global residue theorem, and
find that it is much more intricate compared to scattering amplitudes.Comment: 21 pages, 3 figures; v2: JHEP version + minor correction | A note on NMHV form factors from the Gra{\ss}mannian and the twistor
string | a note on nmhv form factors from the gra{\ss}mannian and the twistor string | mannian formulas chiral multiplet mathcal superconformal mills theory. contour mannian nmhv diagrams bcfw recursion relation. formulas prescription recently. recursive properties. recursive counterpart manifest. explore connection mannian formulations residue intricate pages jhep minor | non_dup | [] |
84333331 | 10.1007/JHEP09(2017)025 | The entire S-matrix elements of four, five and six point functions of
D-brane-anti D-brane system are explored. To deal with symmetries of string
amplitudes as well as their all order $\alpha'$ corrections we first address a
four point function of one closed string Ramond-Ramond (RR) and two real
tachyons on the world volume of brane-anti brane system. We then focus on
symmetries of string theory as well as universal tachyon expansion to achieve
both string and effective field theory of an RR and three tachyons where the
complete algebraic analysis for the whole S-matrix $<V_{C^{-1}} V_{T^{-1}}
V_{T^{0}}V_{T^{0}} >$ was also revealed. Lastly, we employ all the conformal
field theory techniques to $<V_{C^{-1}} V_{T^{-1}} V_{T^{0}}V_{T^{0}}
V_{T^{0}}>$, working out with symmetries of theory and find out the expansion
for the amplitude to be able to precisely discover all order singularity
structures of D-brane-anti-D-brane effective actions of string theory. Various
remarks about the so called generalized Veneziano amplitude and new string
couplings are elaborated as well.Comment: 20 pages.TUW-17-09. The 1st version is accepted to be published by
JHE | Highly Symmetric D-brane-Anti-D-brane Effective Actions | highly symmetric d-brane-anti-d-brane effective actions | brane brane explored. deal symmetries amplitudes alpha ramond ramond tachyons brane brane system. symmetries universal tachyon tachyons algebraic revealed. lastly employ conformal symmetries precisely discover singularity brane brane theory. remarks veneziano couplings elaborated pages.tuw | non_dup | [] |
83849586 | 10.1007/JHEP09(2017)026 | Presence of the light gravitino as dark matter candidate in a supersymmetric
(SUSY) model opens up interesting collider signatures consisting of one or more
hard photons together with multiple jets and missing transverse energy from the
cascade decay. We investigate such signals at the 13 TeV LHC in presence of
compressed SUSY spectra, consistent with the Higgs mass as well as collider and
dark matter constraints. We analyse and compare the discovery potential in
different benchmark scenarios consisting of both compressed and uncompressed
SUSY spectra, considering different levels of compression and intermediate
decay modes. Our conclusion is that compressed spectra upto 2.5 TeV are likely
to be probed even before the high luminosity run of LHC. Kinematic variables
are also suggested, which offer distinction between compressed and uncompressed
spectra yielding similar event rates for photons + multi-jets + $E\!\!\!\!/_T$.Comment: 32 pages, 7 figures, 4 tables. Published in JHEP, minor modifications
in text and few references adde | Search for a compressed supersymmetric spectrum with a light Gravitino | search for a compressed supersymmetric spectrum with a light gravitino | gravitino candidate supersymmetric susy opens collider signatures consisting photons jets missing cascade decay. compressed susy collider constraints. analyse discovery benchmark scenarios consisting compressed uncompressed susy compression modes. compressed upto probed luminosity lhc. kinematic offer distinction compressed uncompressed yielding photons jets .comment pages tables. jhep minor modifications adde | non_dup | [] |
83857399 | 10.1007/JHEP09(2017)027 | The nonsingular bounce models usually suffer from the ghost or gradient
instabilities, as has been proved recently. In this paper, we propose a
covariant effective theory for stable nonsingular bounce, which has the
quadratic order of the second order derivative of the field $\phi$ but the
background set only by $P(\phi,X)$. With it, we explicitly construct a fully
stable nonsingular bounce model for the ekpyrotic scenario.Comment: 12 pages, 6 figures; published in JHEP; an Appendix and references
adde | A covariant Lagrangian for stable nonsingular bounce | a covariant lagrangian for stable nonsingular bounce | nonsingular bounce suffer ghost instabilities proved recently. propose covariant nonsingular bounce quadratic explicitly nonsingular bounce ekpyrotic pages jhep adde | non_dup | [] |
83857436 | 10.1007/JHEP09(2017)028 | We propose a higher-order Skyrme model with derivative terms of eighth, tenth
and twelfth order. Our construction yields simple and easy-to-interpret
higher-order Lagrangians. We first show that a Skyrmion with higher-order terms
proposed by Marleau has an instability in the form of a baby-Skyrmion string,
while the static energies of our construction are positive definite, implying
stability against time-independent perturbations. However, we also find that
the Hamiltonians of our construction possess two kinds of dynamical
instabilities, which may indicate the instability with respect to
time-dependent perturbations. Different from the well-known Ostrogradsky
instability, the instabilities that we find are intrinsically of nonlinear
nature and also due to the fact that even powers of the inverse metric gives a
ghost-like higher-order kinetic-like term. The vacuum state is, however,
stable. Finally, we show that at sufficiently low energies, our Hamiltonians in
the simplest cases, are stable against time-dependent perturbations.Comment: LaTeX: 42 pages, 3 figures; V2: simplifications implemented in Secs.
5 and 6, and references adde | A higher-order Skyrme model | a higher-order skyrme model | propose skyrme eighth tenth twelfth order. interpret lagrangians. skyrmion marleau instability baby skyrmion definite implying perturbations. hamiltonians possess kinds instabilities instability perturbations. ostrogradsky instability instabilities intrinsically powers ghost term. stable. sufficiently hamiltonians simplest latex pages simplifications implemented secs. adde | non_dup | [] |
84333330 | 10.1007/JHEP09(2017)029 | We construct new solutions of the Faddeev-Skyrme model with a symmetry
breaking potential admitting $S^1$ vacuum. It includes, as a limiting case, the
usual $SO(3)$ symmetry breaking mass term, another limit corresponds to the
potential $m^2 \phi_1^2$, which gives a mass to the corresponding component of
the scalar field. However we find that the spacial distribution of the energy
density of these solutions has more complicated structure, than in the case of
the usual Hopfions, typically it represents two separate linked tubes with
different thicknesses and positions. In order to classify these configurations
we define a counterpart of the usual position curve, which represents a
collection of loops $\mathcal{C}_1, \mathcal{C}_{-1}$ corresponding to the
preimages of the points $\vec \phi = (\pm 1 \mp \mu, 0,0)$, respectively. Then
the Hopf invariant can be defined as $Q= {\rm link}
(\mathcal{C}_1,\mathcal{C}_{-1})$. In this model, in the sectors of degrees
$Q=5,6,7$ we found solutions of new type, for which one or both of these tubes
represent trefoil knots. Further, some of these solutions possess different
types of curves $\mathcal{C}_1$ and $\mathcal{C}_{-1}$.Comment: 22 pages, 129 figure | Fractional Hopfions in the Faddeev-Skyrme model with a symmetry breaking
potential | fractional hopfions in the faddeev-skyrme model with a symmetry breaking potential | faddeev skyrme breaking admitting vacuum. limiting usual breaking field. spacial complicated usual hopfions tubes thicknesses positions. classify configurations counterpart usual loops mathcal mathcal preimages respectively. hopf mathcal mathcal sectors tubes trefoil knots. possess mathcal mathcal .comment pages | non_dup | [] |
84092951 | 10.1007/JHEP09(2017)030 | The asymptotically flat structure of $\mathcal{N}=(2,0)$ supergravity in
three spacetime dimensions is explored. The asymptotic symmetries are spanned
by an extension of the super-BMS$_3$ algebra, with two independent $\hat{u}(1)$
currents of electric and magnetic type. These currents are associated to $U(1)$
fields being even and odd under parity, respectively. Remarkably, although the
$U(1)$ fields do not generate a backreaction on the metric, they provide
nontrivial Sugawara-like contributions to the BMS$_3$ generators, and hence to
the energy and the angular momentum. The entropy of flat cosmological
spacetimes with $U(1)$ fields then acquires a nontrivial dependence on the
$\hat{u}(1)$ charges. If the spin structure is odd, the ground state
corresponds to Minkowski spacetime, and although the anticommutator of the
canonical supercharges is linear in the energy and in the electric-like
$\hat{u}(1)$ charge, the energy becomes bounded from below by the energy of the
ground state shifted by the square of the electric-like $\hat{u}(1)$ charge. If
the spin structure is even, the same bound for the energy generically holds,
unless the absolute value of the electric-like charge is less than minus the
mass of Minkowski spacetime in vacuum, so that the energy has to be
nonnegative. The explicit form of the Killing spinors is found for a wide class
of configurations that fulfills our boundary conditions, and they exist
precisely when the corresponding bounds are saturated. It is also shown that
the spectra with periodic or antiperiodic boundary conditions for the fermionic
fields are related by spectral flow, in a similar way as it occurs for the
$\mathcal{N}=2$ super-Virasoro algebra. Indeed, our super-BMS$_3$ algebra can
be recovered from the flat limit of the superconformal algebra with
$\mathcal{N}=(2,2)$, truncating the fermionic generators of the right copy.Comment: 32 pages, no figures. Talk given at the ESI Programme and Workshop
"Quantum Physics and Gravity" hosted by ESI, Vienna, June 2017. V3: minor
changes and typos corrected. Matches published versio | Asymptotic structure of $\mathcal{N}=2$ supergravity in 3D: extended
super-BMS$_3$ and nonlinear energy bounds | asymptotic structure of $\mathcal{n}=2$ supergravity in 3d: extended super-bms$_3$ and nonlinear energy bounds | asymptotically mathcal supergravity spacetime explored. asymptotic symmetries spanned super currents type. currents parity respectively. remarkably backreaction nontrivial sugawara generators momentum. cosmological spacetimes acquires nontrivial charges. minkowski spacetime anticommutator canonical supercharges shifted charge. generically unless minus minkowski spacetime nonnegative. killing spinors configurations fulfills precisely bounds saturated. antiperiodic fermionic mathcal super virasoro algebra. super recovered superconformal mathcal truncating fermionic generators pages figures. talk programme workshop hosted vienna minor typos corrected. matches versio | non_dup | [] |
83850044 | 10.1007/JHEP09(2017)031 | We propose a brane-world setup based on gauge/gravity duality in which the
four-dimensional cosmological constant is set to zero by a dynamical
self-adjustment mechanism. The bulk contains Einstein gravity and a scalar
field. We study holographic RG flow solutions, with the standard model brane
separating an infinite volume UV region and an IR region of finite volume. For
generic values of the brane vacuum energy, regular solutions exist such that
the four-dimensional brane is flat. Its position in the bulk is determined
dynamically by the junction conditions. Analysis of linear fluctuations shows
that a regime of 4-dimensional gravity is possible at large distances, due to
the presence of an induced gravity term. The graviton acquires an effective
mass, and a five-dimensional regime may exist at large and/or small scales. We
show that, for a broad choice of potentials, flat-brane solutions are
manifestly stable and free of ghosts. We compute the scalar contribution to the
force between brane-localized sources and show that, in certain models, the
vDVZ discontinuity is absent and the effective interaction at short distances
is mediated by two transverse graviton helicities.Comment: 65 pages plus appendixes, 18 figures. Minor correction of numerical
factors in sections 4, 5 and appendix | Holographic self-tuning of the cosmological constant | holographic self-tuning of the cosmological constant | propose brane setup duality cosmological adjustment mechanism. einstein field. holographic brane separating infinite volume. generic brane brane flat. dynamically junction conditions. distances term. graviton acquires scales. broad potentials brane manifestly ghosts. brane localized vdvz discontinuity absent distances graviton pages appendixes figures. minor | non_dup | [] |
84332412 | 10.1007/JHEP09(2017)032 | The measurement of azimuthal correlations of charged particles is presented
for Pb-Pb collisions at $\sqrt{s_{\rm NN}}=$ 2.76 TeV and p-Pb collisions at
$\sqrt{s_{\rm NN}}=$ 5.02 TeV with the ALICE detector at the CERN Large Hadron
Collider. These correlations are measured for the second, third and fourth
order flow vector in the pseudorapidity region $|\eta|<0.8$ as a function of
centrality and transverse momentum $p_{\rm T}$ using two observables, to search
for evidence of $p_{\rm T}$-dependent flow vector fluctuations. For Pb-Pb
collisions at 2.76 TeV, the measurements indicate that $p_{\rm T}$-dependent
fluctuations are only present for the second order flow vector. Similar results
have been found for p-Pb collisions at 5.02 TeV. These measurements are
compared to hydrodynamic model calculations with event-by-event geometry
fluctuations in the initial state to constrain the initial conditions and
transport properties of the matter created in Pb-Pb and p-Pb collisions.Comment: 30 pages, 15 captioned figures, 3 tables, authors from page 25,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/367 | Searches for transverse momentum dependent flow vector fluctuations in
Pb-Pb and p-Pb collisions at the LHC | searches for transverse momentum dependent flow vector fluctuations in pb-pb and p-pb collisions at the lhc | azimuthal collisions sqrt collisions sqrt alice cern hadron collider. fourth pseudorapidity centrality observables fluctuations. collisions vector. collisions tev. hydrodynamic constrain created pages captioned tables | non_dup | [] |
73416899 | 10.1007/JHEP09(2017)033 | We study extensions of the Twin Higgs model that solve the Hierarchy problem
and simultaneously address problems of the large- and small-scale structures of
the Universe. Besides naturally providing dark matter (DM) candidates as the
lightest charged twin fermions, the twin sector contains a light photon and
neutrinos, which can modify structure formation relative to the prediction from
the $\Lambda$CDM paradigm. We focus on two scenarios. First, we study a
Fraternal Twin Higgs model in which the spin-3/2 baryon
$\hat{\Omega}\sim(\hat{b}\hat{b}\hat{b})$ and the lepton twin tau $\hat{\tau}$
contribute to the dominant and subcomponent dark matter densities. A
non-decoupled scattering between the twin tau and twin neutrino arising from a
gauged twin lepton number symmetry provides a drag force that damps the density
inhomogeneity of a dark matter subcomponent. Next, we consider the possibility
of having the twin hydrogen atom $\hat{H}$ as the dominant DM component. After
recombination, a small fraction of the twin protons and leptons remains ionized
during structure formation, and their scattering to twin neutrinos through a
gauged U$(1)_{B-L}$ force provides the mechanism that damps the density
inhomogeneity. Both scenarios realize the Partially Acoustic dark matter
(PAcDM) scenario and explain the $\sigma_8$ discrepancy between the CMB and
weak lensing results. Moreover, the self-scattering neutrino behaves as a dark
fluid that enhances the size of the Hubble rate $H_0$ to accommodate the local
measurement result while satisfying the CMB constraint. For the small-scale
structure, the scattering of $\hat{\Omega}$'s and $\hat{H}$'s through the twin
photon exchange generates a self-interacting dark matter (SIDM) model that
solves the mass deficit problem from dwarf galaxy to galaxy cluster scales.Comment: 22 pages, 5 figures; version accepted for publication in JHEP;
include discussion of twin hydrogen D | Reconciling Large And Small-Scale Structure In Twin Higgs Models | reconciling large and small-scale structure in twin higgs models | extensions twin solve hierarchy simultaneously universe. besides naturally candidates lightest twin fermions twin neutrinos modify lambda paradigm. scenarios. fraternal twin baryon omega lepton twin subcomponent densities. decoupled twin twin arising gauged twin lepton drag damps inhomogeneity subcomponent. twin atom component. recombination twin protons leptons ionized twin neutrinos gauged damps inhomogeneity. scenarios realize partially acoustic pacdm sigma discrepancy lensing results. behaves enhances hubble accommodate satisfying constraint. omega twin generates interacting sidm solves deficit dwarf pages publication jhep twin | non_dup | [] |
83857720 | 10.1007/JHEP09(2017)034 | Triple-W-boson production in proton-proton collisions allows for a direct
access to the triple and quartic gauge couplings and provides a window to the
mechanism of electroweak symmetry breaking. It is an important process to test
the Standard Model (SM) and might be background to physics beyond the SM. We
present a calculation of the next-to-leading order (NLO) electroweak
corrections to the production of WWW final states at proton-proton colliders
with on-shell W bosons and combine the electroweak with the NLO QCD
corrections. We study the impact of the corrections to the integrated cross
sections and to kinematic distributions of the W bosons. The electroweak
corrections are generically of the size of 5-10% for integrated cross sections
and become more pronounced in specific phase-space regions. The real
corrections induced by quark-photon scattering turn out to be as important as
electroweak loops and photon bremsstrahlung corrections, but can be reduced by
phase-space cuts. Considering that prior determinations of the photon parton
distribution function (PDF) involve rather large uncertainties, we compare the
results obtained with different photon PDFs and discuss the corresponding
uncertainties in the NLO predictions. Moreover, we determine the scale and
total PDF uncertainties at the LHC and a possible future 100 TeV pp collider.Comment: 15 pages, 9 figures, 5 tables, revised version, published in JHE | Next-to-leading-order QCD and electroweak corrections to WWW production
at proton-proton colliders | next-to-leading-order qcd and electroweak corrections to www production at proton-proton colliders | triple boson proton proton collisions triple quartic couplings window electroweak breaking. electroweak proton proton colliders bosons combine electroweak corrections. kinematic bosons. electroweak generically pronounced regions. electroweak loops bremsstrahlung cuts. determinations parton involve pdfs predictions. pages tables revised | non_dup | [] |
84090720 | 10.1007/JHEP09(2017)035 | Integrable deformation of SU(2) sigma and lambda models are considered at the
classical and quantum levels. These are the Yang-Baxter and XXZ-type
anisotropic deformations. The XXZ type deformations are UV safe in one regime,
while in another regime, like the Yang-Baxter deformations, they exhibit cyclic
RG behaviour. The associated affine quantum group symmetry, realized
classically at the Poisson bracket level, has q a complex phase in the UV safe
regime and q real in the cyclic RG regime, where q is an RG invariant. Based on
the symmetries and RG flow we propose exact factorizable S-matrices to describe
the scattering of states in the lambda models, from which the sigma models
follow by taking a limit and non-abelian T-duality. In the cyclic RG regimes,
the S-matrices are periodic functions of rapidity, at large rapidity, and in
the Yang-Baxter case violate parity.Comment: 55 pages; v2 - refs added and some expanded discussion of
\tilde{\beta}^\ph | Yang Baxter and Anisotropic Sigma and Lambda Models, Cyclic RG and Exact
S-Matrices | yang baxter and anisotropic sigma and lambda models, cyclic rg and exact s-matrices | integrable deformation sigma lambda levels. baxter anisotropic deformations. deformations safe baxter deformations exhibit cyclic behaviour. affine realized classically poisson bracket safe cyclic invariant. symmetries propose factorizable lambda sigma abelian duality. cyclic regimes rapidity rapidity baxter violate pages refs expanded tilde beta | non_dup | [] |
78511526 | 10.1007/JHEP09(2017)036 | In theories with a perturbatively massless 2-form (dual to an axion), a
paradox may arise in the process of black hole evaporation. Schwarzschild black
holes can support a non-trivial Wilson-line-type field, the integral of the
2-form around their horizon. After such an 'axionic black hole' evaporates, the
Wilson line must be supported by the corresponding 3-form field strength in the
region formerly occupied by the black hole. In the limit of small axion
decay-constant f, the energy required for this field configuration is too
large. The natural resolution is through the presence of light strings, which
allow the black hole to "shed" its axionic hair sufficiently early. This gives
rise to a new Weak-Gravity-type argument in the 2-form context: Small coupling,
in this case f, enforces the presence of light strings or a low cutoff. We also
discuss how this argument may be modified in situations where the weak coupling
regime is achieved in the low-energy effective theory through an appropriate
gauging of a model with a vector field and two 2-forms.Comment: 16 pages, 1 figure, minor changes, added reference | The Weak Gravity Conjecture and the Axionic Black Hole Paradox | the weak gravity conjecture and the axionic black hole paradox | perturbatively massless axion paradox arise evaporation. schwarzschild holes trivial wilson horizon. axionic evaporates wilson formerly occupied hole. axion large. strings shed axionic hair sufficiently early. argument enforces strings cutoff. argument situations gauging pages minor | non_dup | [] |
84092972 | 10.1007/JHEP09(2017)037 | Searching for top squark (stop) is a crucial task of the LHC. When the flavor
conserving two body decays of the stop are kinematically forbidden, the stops
produced near the threshold will live long enough to form bound states which
subsequently decay through annihilation into the Standard Model (SM) final
states. In the region of stop mixing angle $\theta_{\tilde{t}} \to 0$ or
$\pi/2$, we note that the LHC-13 TeV diphoton resonance data can give a strong
bound on the spin-$0$ stoponium ($\eta_{\tilde{t}}$) and exclude the
constituent stop mass $m_{\tilde{t}}$ up to about 290 GeV. While in the large
stop mixing region, the stoponium will dominantly decay to the Higgs pair. By
analyzing the process $pp \to \eta_{\tilde{t}} \to h (\to b\bar{b} )h (\to
\tau^+\tau^-)$, we find that a large portion of the parameter space on the
$m_{\tilde{t}_1}$ - $\theta_{\tilde{t}}$ plane can be probed at $2\sigma$
significance level at the LHC with the luminosity ${\cal L}=3000$ fb$^{-1}$.Comment: 12 pages, discussions and references added, version accepted by JHE | Resonant Higgs pair production as a probe of stop at the LHC | resonant higgs pair production as a probe of stop at the lhc | searching squark stop crucial lhc. flavor conserving decays stop kinematically forbidden stops live subsequently annihilation states. stop theta tilde diphoton stoponium tilde exclude constituent stop tilde gev. stop stoponium dominantly pair. analyzing tilde portion tilde theta tilde probed sigma luminosity .comment pages discussions | non_dup | [] |
83863659 | 10.1007/JHEP09(2017)038 | In this paper we study an $AdS_5$ solution constructed using non-Abelian
T-duality, acting on the Klebanov-Witten background. We show that this is dual
to a linear quiver with two tails of gauge groups of increasing rank. The field
theory dynamics arises from a D4-NS5-NS5' brane set-up, generalizing the
constructions discussed by Bah and Bobev. These realize $\mathcal{N}=1$ quiver
gauge theories built out of $\mathcal{N}=1$ and $\mathcal{N}=2$ vector
multiplets flowing to interacting fixed points in the infrared. We compute the
central charge using $a$-maximization, and show its precise agreement with the
holographic calculation. Our result exhibits $n^3$ scaling with the number of
five-branes. This suggests an eleven-dimensional interpretation in terms of
M5-branes, a generic feature of various $AdS$ backgrounds obtained via
non-Abelian T-duality.Comment: 27 pages plus interesting appendixes and various figures. Improved
quiver field theory proposa | The $AdS_5$ non-Abelian T-dual of Klebanov-Witten as a $\mathcal{N} = 1$
linear quiver from M5-branes | the $ads_5$ non-abelian t-dual of klebanov-witten as a $\mathcal{n} = 1$ linear quiver from m5-branes | abelian duality acting klebanov witten background. quiver tails rank. arises brane generalizing constructions bobev. realize mathcal quiver built mathcal mathcal multiplets flowing interacting infrared. maximization precise holographic calculation. exhibits branes. eleven branes generic backgrounds abelian pages appendixes figures. quiver proposa | non_dup | [] |
83863531 | 10.1007/JHEP09(2017)039 | The geometry of twisted null geodesic congruences in gravitational plane wave
spacetimes is explored, with special focus on homogeneous plane waves. The role
of twist in the relation of the Rosen coordinates adapted to a null congruence
with the fundamental Brinkmann coordinates is explained and a generalised form
of the Rosen metric describing a gravitational plane wave is derived. The
Killing vectors and isometry algebra of homogeneous plane waves (HPWs) are
described in both Brinkmann and twisted Rosen form and used to demonstrate the
coset space structure of HPWs. The van Vleck-Morette determinant for twisted
congruences is evaluated in both Brinkmann and Rosen descriptions. The twisted
null congruences of the Ozsvath-Schucking,`anti-Mach' plane wave are
investigated in detail. These developments provide the necessary geometric
toolkit for future investigations of the role of twist in loop effects in
quantum field theory in curved spacetime, where gravitational plane waves arise
generically as Penrose limits; in string theory, where they are important as
string backgrounds; and potentially in the detection of gravitational waves in
astronomy.Comment: 60 pages, 2 figures. Extended version with new material on Rosen
geodesics and isometries. Title change | A New Twist on the Geometry of Gravitational Plane Waves | a new twist on the geometry of gravitational plane waves | twisted geodesic congruences gravitational spacetimes explored homogeneous waves. twist rosen adapted congruence brinkmann generalised rosen describing gravitational derived. killing isometry homogeneous hpws brinkmann twisted rosen coset hpws. vleck morette determinant twisted congruences brinkmann rosen descriptions. twisted congruences ozsvath schucking mach detail. developments geometric toolkit investigations twist curved spacetime gravitational arise generically penrose backgrounds potentially gravitational pages figures. rosen geodesics isometries. title | non_dup | [] |
83842103 | 10.1007/JHEP09(2017)040 | Over the past years, experiments accumulated intriguing hints for new physics
(NP) in flavor observables, namely in the anomalous magnetic moment of the muon
($a_\mu$), in $R(D^{(*)})={\rm Br}(B\to D^{(*)}\tau\nu)/{\rm Br}(B\to
D^{(*)}\ell\nu)$ and in $b\to s\mu^+\mu^-$ transitions, which are all at the
$3-4\,\sigma$ level. In this article we point out that one can explain the
$R(D^{(*)})$ anomaly using two scalar leptoquarks (LQs) with the same mass and
coupling to fermions related via a discrete symmetry: an $SU(2)$ singlet and an
$SU(2)$ triplet, both with hypercharge $Y=-2/3$. In this way, potentially
dangerous contributions to $b\to s\nu\nu$ are avoided and non-CKM suppressed
effects in $R(D^{(*)})$ can be generated. This allows for smaller overall
couplings to fermions weakening the direct LHC bounds. In our model,
$R(D^{(*)})$ is directly correlated to $b\to s\tau^+\tau^-$ transitions where
an enhancement by orders of magnitude compared to the standard model (SM) is
predicted, such that these decay modes are in the reach of LHCb and BELLE II.
Furthermore, one can also naturally explain the $b\to s\mu^+\mu^-$ anomalies
(including $R(K)$) by a $C_9=-C_{10}$ like contribution without spoiling
$\mu-e$ universality in charged current decays. In this case sizable effects in
$b\to s\tau\mu$ transitions are predicted which are again well within the
experimental reach. One can even address the longstanding anomaly in $a_\mu$,
generating a sizable decay rate for $\tau\to\mu\gamma$. However, we find that
out of the three anomalies $R(D^{(*)})$, $b\to s\mu^+\mu^-$ and $a_{\mu}$ only
two (but any two) can be explained simultaneously.Comment: 8 pages, 4 figures, version accepted for publication in JHE | Simultaneous Explanation of $R(D^{(*)})$ and $b\to s\mu^+\mu^-$: The
Last Scalar Leptoquarks Standing | simultaneous explanation of $r(d^{(*)})$ and $b\to s\mu^+\mu^-$: the last scalar leptoquarks standing | accumulated intriguing hints flavor observables anomalous moment muon sigma level. anomaly leptoquarks fermions singlet triplet hypercharge potentially dangerous avoided suppressed generated. couplings fermions weakening bounds. enhancement orders lhcb belle naturally anomalies spoiling universality decays. sizable reach. longstanding anomaly generating sizable gamma anomalies pages publication | non_dup | [] |
83857464 | 10.1007/JHEP09(2017)041 | It is well known that the annihilation of Majorana dark matter into fermions
is helicity suppressed. Here, we point out that the underlying mechanism is a
subtle combination of two distinct effects, and we present a comprehensive
analysis of how the suppression can be partially or fully lifted by the
internal bremsstrahlung of an additional boson in the final state. As a
concrete illustration, we compute analytically the full amplitudes and
annihilation rates of supersymmetric neutralinos to final states that contain
any combination of two standard model fermions, plus one electroweak gauge
boson or one of the five physical Higgs bosons that appear in the minimal
supersymmetric standard model. We classify the various ways in which these
three-body rates can be large compared to the two-body rates, identifying cases
that have not been pointed out before. In our analysis, we put special emphasis
on how to avoid the double counting of identical kinematic situations that
appear for two-body and three-body final states, in particular on how to
correctly treat differential rates and the spectrum of the resulting stable
particles that is relevant for indirect dark matter searches. We find that both
the total annihilation rates and the yields can be significantly enhanced when
taking into account the corrections computed here, in particular for models
with somewhat small annihilation rates at tree-level which otherwise would not
be testable with indirect dark matter searches. Even more importantly, however,
we find that the resulting annihilation spectra of positrons, neutrinos,
gamma-rays and antiprotons differ in general substantially from the
model-independent spectra that are commonly adopted, for these final states,
when constraining particle dark matter with indirect detection experiments.Comment: 64 pages with jheppub.sty, 15 figures and 12 tables. Slightly
extended discussion + minor updates to match published versio | Electroweak and Higgs Boson Internal Bremsstrahlung: General
considerations for Majorana dark matter annihilation and application to MSSM
neutralinos | electroweak and higgs boson internal bremsstrahlung: general considerations for majorana dark matter annihilation and application to mssm neutralinos | annihilation majorana fermions helicity suppressed. subtle comprehensive suppression partially lifted bremsstrahlung boson state. concrete illustration analytically amplitudes annihilation supersymmetric neutralinos fermions electroweak boson bosons supersymmetric model. classify ways identifying pointed before. emphasis avoid counting kinematic situations correctly treat indirect searches. annihilation somewhat annihilation testable indirect searches. importantly annihilation positrons neutrinos gamma rays antiprotons substantially commonly adopted constraining indirect pages jheppub.sty tables. minor updates match versio | non_dup | [] |
73990087 | 10.1007/JHEP09(2017)042 | The holographic complexity is UV divergent. As a finite complexity, we
propose a "regularized complexity" by employing a similar method to the
holographic renormalization. We add codimension-two boundary counterterms which
do not contain any boundary stress tensor information. It means that we
subtract only non-dynamic background and all the dynamic information of
holographic complexity is contained in the regularized part. After showing the
general counterterms for both CA and CV conjectures in holographic spacetime
dimension 5 and less, we give concrete examples: the BTZ black holes and the
four and five dimensional Schwarzschild AdS black holes. We propose how to
obtain the counterterms in higher spacetime dimensions and show explicit
formulas only for some special cases with enough symmetries. We also compute
the complexity of formation by using the regularized complexity.Comment: Published version with some small improvement | Surface Counterterms and Regularized Holographic Complexity | surface counterterms and regularized holographic complexity | holographic divergent. propose regularized employing holographic renormalization. codimension counterterms information. subtract holographic regularized part. counterterms conjectures holographic spacetime concrete holes schwarzschild holes. propose counterterms spacetime formulas symmetries. regularized | non_dup | [] |
73960599 | 10.1007/JHEP09(2017)043 | Modular inflation is the restriction to two fields of automorphic inflation,
a general group based framework for multifield scalar field theories with
curved target spaces, which can be parametrized by the comoving curvature
perturbation ${\cal R}$ and the isocurvature perturbation tensor $S^{IJ}$. This
paper describes the dynamics and observables of these perturbations and
considers in some detail the special case of modular inflation as an extensive
class of two-field inflation theories with a conformally flat target space. It
is shown that the nonmodular nature of derivatives of modular forms leads to
CMB observables in modular invariant inflation theories that are in general
constructed from almost holomorphic modular forms. The phenomenology of the
model of $j$-inflation is compared to the recent observational constraints from
the Planck satellite and the BICEP2/Keck Array data.Comment: 39 pages, 3 figures. This extended version includes a detailed
discussion of the almost holomorphic nature of the physical observables in
modular invariant inflation theorie | Modular Inflation Observables and $j$-Inflation Phenomenology | modular inflation observables and $j$-inflation phenomenology | modular inflation restriction automorphic inflation multifield curved parametrized comoving curvature perturbation isocurvature perturbation describes observables perturbations considers modular inflation extensive inflation conformally space. nonmodular derivatives modular observables modular inflation holomorphic modular forms. phenomenology inflation observational planck satellite bicep keck array pages figures. holomorphic observables modular inflation theorie | non_dup | [] |
83862179 | 10.1007/JHEP09(2017)044 | We study duality twisted reductions of the Double Field Theory (DFT) of the
RR sector of massless Type II theory, with twists belonging to the duality
group $Spin^+(10,10)$. We determine the action and the gauge algebra of the
resulting theory and determine the conditions for consistency. In doing this,
we work with the DFT action constructed by Hohm, Kwak and Zwiebach, which we
rewrite in terms of the Mukai pairing: a natural bilinear form on the space of
spinors, which is manifestly $Spin(n,n)$ invariant. If the duality twist is
introduced via the $Spin^+(10,10)$ element $S$ in the RR sector, then the NS-NS
sector should also be deformed via the duality twist $U = \rho(S)$, where
$\rho$ is the double covering homomorphism between $Pin(n,n)$ and $O(n,n)$. We
show that the set of conditions required for the consistency of the reduction
of the NS-NS sector are also crucial for the consistency of the reduction of
the RR sector, owing to the fact that the Lie algebras of $Spin(n,n)$ and
$SO(n,n)$ are isomorphic. In addition, requirement of gauge invariance imposes
an extra constraint on the fluxes that determine the deformations.Comment: chapter 4 revised and expanded, references added, published versio | Duality Twisted Reductions of Double Field Theory of Type II Strings | duality twisted reductions of double field theory of type ii strings | duality twisted reductions massless twists belonging duality consistency. hohm kwak zwiebach rewrite mukai pairing bilinear spinors manifestly invariant. duality twist deformed duality twist covering homomorphism consistency crucial consistency owing algebras isomorphic. requirement invariance imposes extra fluxes revised expanded versio | non_dup | [] |
83865244 | 10.1007/JHEP09(2017)047 | The MHV action is the Yang-Mills action quantized on the light-front, where
the two explicit physical gluonic degrees of freedom have been canonically
transformed to a new set of fields. This transformation leads to the action
with vertices being off-shell continuations of the MHV amplitudes. We show that
the solution to the field transformation expressing one of the new fields in
terms of the Yang-Mills field is a certain type of the Wilson line. More
precisely, it is a straight infinite gauge link with a slope extending to the
light-cone minus and the transverse direction. One of the consequences of that
fact is that certain MHV vertices reduced partially on-shell are gauge
invariant -- a fact discovered before using conventional light-front
perturbation theory. We also analyze the diagrammatic content of the field
transformations leading to the MHV action. We found that the diagrams for the
solution to the transformation (given by the Wilson line) and its inverse
differ only by light-front energy denominators. Further, we investigate the
coordinate space version of the inverse solution to the one given by the Wilson
line. We find an explicit expression given by a power series in fields. We also
give a geometric interpretation to it by means of a specially defined vector
field. Finally, we discuss the fact that the Wilson line solution to the
transformation is directly related to the all-like helicity gluon wave
function, while the inverse functional is a generating functional for solutions
of self-dual Yang-Mills equations.Comment: 44 pages, a few figure | Wilson lines in the MHV action | wilson lines in the mhv action | mills quantized front gluonic freedom canonically transformed fields. continuations amplitudes. expressing mills wilson line. precisely straight infinite extending cone minus direction. consequences partially discovered front perturbation theory. analyze diagrammatic transformations action. diagrams wilson front denominators. coordinate wilson line. fields. geometric specially field. wilson helicity gluon generating mills pages | non_dup | [] |
73406884 | 10.1007/JHEP09(2017)048 | We explore the connection between the process of relaxation in the BMN matrix
model and the physics of black holes in AdS/CFT. Focusing on Dyson-fluid
solutions of the matrix model, we perform numerical simulations of the real
time dynamics of the system. By quenching the equilibrium distribution we study
the quasi-normal oscillations of scalar single trace observables, we isolate
the lowest quasi-normal mode, and we determine its frequencies as function of
the energy. Considering the BMN matrix model as a truncation of $\mathcal{N}=4$
SYM, we also compute the frequencies of the quasi-normal modes of the dual
scalar fields in the AdS$_5$-Schwarzschild background. We compare the results,
and we find a surprising similarity.Comment: 19 pages, 10 figures, v2: presentation and discussion improved in
various points according to the referee report, references added, to appear
in JHE | Quasi-Normal Modes from Non-Commutative Matrix Dynamics | quasi-normal modes from non-commutative matrix dynamics | explore connection relaxation holes cft. focusing dyson system. quenching quasi oscillations trace observables isolate quasi energy. truncation mathcal quasi schwarzschild background. surprising pages presentation referee | non_dup | [] |
83868236 | 10.1007/JHEP09(2017)050 | We present a complete symmetry classification of the Sachdev-Ye-Kitaev (SYK)
model with $\mathcal{N}=0$, $1$ and $2$ supersymmetry (SUSY) on the basis of
the Altland-Zirnbauer scheme in random matrix theory (RMT). For $\mathcal{N}=0$
and $1$ we consider generic $q$-body interactions in the Hamiltonian and find
RMT classes that were not present in earlier classifications of the same model
with $q=4$. We numerically establish quantitative agreement between the
distributions of the smallest energy levels in the $\mathcal{N}=1$ SYK model
and RMT. Furthermore, we delineate the distinctive structure of the
$\mathcal{N}=2$ SYK model and provide its complete symmetry classification
based on RMT for all eigenspaces of the fermion number operator. We corroborate
our classification by detailed numerical comparisons with RMT and thus
establish the presence of quantum chaotic dynamics in the $\mathcal{N}=2$ SYK
model. We also introduce a new SYK-like model without SUSY that exhibits hybrid
properties of the $\mathcal{N}=1$ and $\mathcal{N}=2$ SYK models and uncover
its rich structure both analytically and numerically.Comment: 42 pages, 12 figures. v2: refs adde | Complete random matrix classification of SYK models with
$\mathcal{N}=0$, $1$ and $2$ supersymmetry | complete random matrix classification of syk models with $\mathcal{n}=0$, $1$ and $2$ supersymmetry | sachdev kitaev mathcal supersymmetry susy altland zirnbauer mathcal generic classifications numerically establish smallest mathcal rmt. delineate distinctive mathcal eigenspaces fermion operator. corroborate comparisons establish chaotic mathcal model. susy exhibits hybrid mathcal mathcal uncover analytically pages figures. refs adde | non_dup | [] |
132599719 | 10.1007/JHEP09(2017)052 | We consider a U(1)' extended supersymmetric model with a right-handed neutrino superfield which can generate light neutrino mass by Type I seesaw mechanism. The lighter superpartner of the right-handed neutrino could be the scalar dark matter. These right-handed sneutrinos can come from the decay of (Z) over tilde', superpartner of the extra gauge boson Z'. Left-right handed sneutrino mixings affect their decays further, giving rise to displaced "lepton flavour violating" signatures. A wino-like chargino NLSP (next to lightest supersymmetric particle) creates even more interesting decay topology. We investigate such displaced multi-leptonic final states with "lepton flavour violation" from the supersymmetric cascade decays of third generation squarks at the LHC | Displaced lepton flavour violating signatures of right-handed sneutrinos in U(1)′ supersymmetric models | displaced lepton flavour violating signatures of right-handed sneutrinos in u(1)′ supersymmetric models | supersymmetric handed superfield seesaw mechanism. lighter superpartner handed matter. handed sneutrinos come tilde superpartner extra boson handed sneutrino mixings decays giving displaced lepton flavour violating signatures. wino chargino nlsp lightest supersymmetric creates topology. displaced leptonic lepton flavour violation supersymmetric cascade decays squarks | non_dup | [] |
83834104 | 10.1007/JHEP09(2017)055 | We consider the correlation function of an arbitrary number of local
observables in quantum field theory. We show that, at tree level in the strong
field regime, these correlations arise solely from fluctuations in the initial
state. We obtain the general expression of these correlation functions in terms
of the classical solution of the field equation of motion and its derivatives
with respect to its initial conditions, that can be arranged graphically as the
sum of labeled trees where the nodes are the individual observables, and the
links are pairs of derivatives acting on them. For 3-point (and higher)
correlation functions, there are additional tree-level terms beyond from the
strong field approximation, generated throughout the evolution of the system.Comment: 37 page | Tree-level correlations in the strong field regime | tree-level correlations in the strong field regime | observables theory. arise solely state. derivatives arranged graphically labeled trees observables links derivatives acting them. | non_dup | [] |
83863609 | 10.1007/JHEP09(2017)056 | We study the entanglement entropy between (possibly distinct) topological
phases across an interface using an Abelian Chern-Simons description with
topological boundary conditions (TBCs) at the interface. From a microscopic
point of view, these TBCs correspond to turning on particular gapping
interactions between the edge modes across the interface. However, in studying
entanglement in the continuum Chern-Simons description, we must confront the
problem of non-factorization of the Hilbert space, which is a standard property
of gauge theories. We carefully define the entanglement entropy by using an
extended Hilbert space construction directly in the continuum theory. We show
how a given TBC isolates a corresponding gauge invariant state in the extended
Hilbert space, and hence compute the resulting entanglement entropy. We find
that the sub-leading correction to the area law remains universal, but depends
on the choice of topological boundary conditions. This agrees with the
microscopic calculation of \cite{Cano:2014pya}. Additionally, we provide a
replica path integral calculation for the entropy. In the case when the
topological phases across the interface are taken to be identical, our
construction gives a novel explanation of the equivalence between the
left-right entanglement of (1+1)d Ishibashi states and the spatial entanglement
of (2+1)d topological phases.Comment: 36 pages, 7 figures, two appendice | Interface Contributions to Topological Entanglement in Abelian
Chern-Simons Theory | interface contributions to topological entanglement in abelian chern-simons theory | entanglement possibly topological abelian chern simons topological tbcs interface. microscopic tbcs turning gapping interface. studying entanglement continuum chern simons confront factorization hilbert theories. carefully entanglement hilbert continuum theory. isolates hilbert entanglement entropy. universal topological conditions. agrees microscopic cite cano additionally replica entropy. topological explanation equivalence entanglement ishibashi entanglement topological pages appendice | non_dup | [] |
78510501 | 10.1007/JHEP09(2017)057 | The Thirring model with random couplings is a translationally invariant
generalisation of the SYK model to 1+1 dimensions, which is tractable in the
large N limit. We compute its two point function, at large distances, for any
strength of the random coupling. For a given realisation, the couplings contain
both irrelevant and relevant marginal operators, but statistically, in the
large N limit, the random couplings are overall always marginally irrelevant,
in sharp distinction to the usual Thirring model. We show the leading term to
the $\beta$ function in conformal perturbation theory, which is quadratic in
the couplings, vanishes, while its usually subleading cubic term matches our RG
flow.Comment: 27 pages. Minor change | Comments on the Random Thirring Model | comments on the random thirring model | thirring couplings translationally generalisation tractable limit. distances coupling. realisation couplings irrelevant marginal statistically couplings marginally irrelevant sharp distinction usual thirring model. beta conformal perturbation quadratic couplings vanishes subleading cubic matches pages. minor | non_dup | [] |
84094855 | 10.1007/JHEP09(2017)058 | This paper describes the calculation of the next-to-leading order (NLO) QCD
corrections to massive color-octet vector boson pair production at hadron
colliders. As a concrete framework, a two-site coloron model with an internal
parity is chosen, which can be regarded as an effective low-energy
approximation of Kaluza-Klein gluon physics in universal extra dimensions. The
renormalization procedure involves several subtleties, which are discussed in
detail. The impact of the NLO corrections is relatively modest, amounting to a
reduction of 11-14% in the total cross-section, but they significantly reduce
the scale dependence of the LO result | QCD corrections to massive color-octet vector boson pair production | qcd corrections to massive color-octet vector boson pair production | describes massive octet boson hadron colliders. concrete coloron parity regarded kaluza klein gluon universal extra dimensions. renormalization involves subtleties detail. modest amounting | non_dup | [] |
86415331 | 10.1007/JHEP09(2017)059 | We study the cubic wave equation in AdS_(d+1) (and a closely related cubic
wave equation on S^3) in a weakly nonlinear regime. Via time-averaging, these
systems are accurately described by simplified infinite-dimensional quartic
Hamiltonian systems, whose structure is mandated by the fully resonant spectrum
of linearized perturbations. The maximally rotating sector, comprising only the
modes of maximal angular momentum at each frequency level, consistently
decouples in the weakly nonlinear regime. The Hamiltonian systems obtained by
this decoupling display remarkable periodic return behaviors closely analogous
to what has been demonstrated in recent literature for a few other related
equations (the cubic Szego equation, the conformal flow, the LLL equation).
This suggests a powerful underlying analytic structure, such as integrability.
We comment on the connection of our considerations to the Gross-Pitaevskii
equation for harmonically trapped Bose-Einstein condensates.Comment: 17 page | Maximally rotating waves in AdS and on spheres | maximally rotating waves in ads and on spheres | cubic closely cubic weakly regime. averaging accurately simplified infinite quartic mandated resonant linearized perturbations. maximally rotating comprising maximal consistently decouples weakly regime. decoupling display remarkable return behaviors closely analogous cubic szego conformal powerful analytic integrability. comment connection considerations gross pitaevskii harmonically trapped bose einstein | non_dup | [] |
83868497 | 10.1007/JHEP09(2017)060 | We show that the proper interpretation of the cocycle operators appearing in
the physical vertex operators of compactified strings is that the closed string
target is non-commutative. We track down the appearance of this
non-commutativity to the Polyakov action of the flat closed string in the
presence of translational monodromies (i.e., windings). In view of the
unexpected nature of this result, we present detailed calculations from a
variety of points of view, including a careful understanding of the
consequences of mutual locality in the vertex operator algebra, as well as a
detailed analysis of the symplectic structure of the Polyakov string. We also
underscore why this non-commutativity was not emphasized previously in the
existing literature. This non-commutativity can be thought of as a central
extension of the zero-mode operator algebra, an effect set by the string length
scale -- it is present even in trivial backgrounds. Clearly, this result
indicates that the $\alpha'\to 0$ limit is more subtle than usually assumed.Comment: 22 page | Intrinsic non-commutativity of closed string theory | intrinsic non-commutativity of closed string theory | proper cocycle appearing compactified strings commutative. track appearance commutativity polyakov translational monodromies i.e. windings unexpected careful consequences mutual locality symplectic polyakov string. underscore commutativity emphasized literature. commutativity thought trivial backgrounds. alpha subtle | non_dup | [] |
83854927 | 10.1007/JHEP09(2017)061 | The growing experimental indication of Lepton Flavour Universality Violation
(LFUV) both in charged- and neutral-current semileptonic B-decays, has
triggered many theoretical interpretations of such non-standard phenomena.
Focusing on popular scenarios where the explanation of these anomalies requires
New Physics at the TeV scale, we emphasise the importance of including
electroweak corrections to obtain trustable predictions for the models in
question. We find that the most important quantum effects are the modifications
of the leptonic couplings of the W and Z vector bosons and the generation of a
purely leptonic effective Lagrangian. As a result, the tight experimental
bounds on Z-pole observables and tau decays challenge an explanation of the
current non-standard data. We illustrate how these effects arise, by providing
a detailed discussion of the running and matching procedure which is necessary
to derive the low-energy effective Lagrangian.Comment: 38 pages, 7 figures. V2: Text improvments. Published versio | On the Importance of Electroweak Corrections for B Anomalies | on the importance of electroweak corrections for b anomalies | growing indication lepton flavour universality violation lfuv neutral semileptonic decays triggered interpretations phenomena. focusing popular scenarios explanation anomalies emphasise electroweak trustable question. modifications leptonic couplings bosons purely leptonic lagrangian. tight bounds pole observables decays challenge explanation data. illustrate arise running matching derive pages figures. improvments. versio | non_dup | [] |
84092883 | 10.1007/JHEP09(2017)062 | Analytic expressions for the two dimensional $\mathcal{N}=1$ SLFT blocks in
the light semi-classical limit are found for both Neveu-Schwarz and Ramond
sectors. The calculations are done by using the duality between $SU(2)$
$\mathcal{N}=2$ super-symmetric gauge theories living on $R^4/Z_2$ space and
two dimensional $\mathcal{N}=1$ super Liouville field theory. It is shown that
in the light asymptotic limit only a restricted set of Young diagrams
contribute to the partition function. This enables us to sum up the instanton
series explicitly and find closed expressions for the corresponding
$\mathcal{N}=1$ SLFT four point blocks in the light asymptotic limit.Comment: 26 pages, 5 figure | The light asymptotic limit of conformal blocks in $\mathcal{N}=1$ super
Liouville field theory | the light asymptotic limit of conformal blocks in $\mathcal{n}=1$ super liouville field theory | analytic expressions mathcal slft blocks neveu schwarz ramond sectors. duality mathcal super living mathcal super liouville theory. asymptotic restricted diagrams partition function. enables instanton explicitly expressions mathcal slft blocks asymptotic pages | non_dup | [] |
84093504 | 10.1007/JHEP09(2017)063 | We calculate the (semi-)static hard-loop self-energy and propagator using the
Keldysh formalism in a momentum-space anisotropic quark-gluon plasma. The
static retarded, advanced, and Feynman (symmetric) self-energies and
propagators are calculated to all orders in the momentum-space anisotropy
parameter $\xi$. For the retarded and advanced self-energies/propagators, we
present a concise derivation and comparison with previously-obtained results
and extend the calculation of the self-energies to next-to-leading order in the
gluon energy, $\omega$. For the Feynman self-energy/propagator, we present new
results which are accurate to all orders in $\xi$. We compare our exact results
with prior expressions for the Feynman self-energy/propagator which were
obtained using Taylor-expansions around an isotropic state. We show that,
unlike the Taylor-expanded results, the all-orders expression for the Feynman
propagator is free from infrared singularities. Finally, we discuss the
application of our results to the calculation of the imaginary-part of the
heavy-quark potential in an anisotropic quark-gluon plasma.Comment: 22 page | The static hard-loop gluon propagator to all orders in anisotropy | the static hard-loop gluon propagator to all orders in anisotropy | propagator keldysh formalism anisotropic gluon plasma. retarded advanced feynman propagators orders anisotropy retarded advanced propagators concise derivation extend gluon omega feynman propagator orders expressions feynman propagator taylor expansions isotropic state. unlike taylor expanded orders feynman propagator infrared singularities. imaginary anisotropic gluon | non_dup | [] |
78509350 | 10.1007/JHEP09(2017)064 | Higgsinos and Wino have strong motivations for being Dark Matter (DM)
candidates in supersymmetry, but their annihilation cross sections are quite
large. For thermal generation and a single component DM setup the higgsinos or
wino may have masses of around 1 or 2-3 TeV respectively. For such DM
candidates, a small amount of slepton coannihilation may decrease the effective
DM annihilation cross section. This, in turn reduces the lower limit of the
relic density satisfied DM mass by more than 50%. Almost a similar degree of
reduction of the same limit is also seen for squark coannihilations. However,
on the contrary, for near degeneracy of squarks and higgsino DM, near its
generic upper limit, the associated coannihilations may decrease the relic
density, thus extending the upper limit towards higher DM masses. We also
compute the direct and indirect detection signals. Here, because of the
quasi-mass degeneracy of the squarks and the LSP, we come across a situation
where squark exchange diagrams may contribute significantly or more strongly
than the Higgs exchange contributions in the spin-independent direct detection
cross section of DM. For the higgsino-DM scenario, we observe that a DM mass of
600 GeV to be consistent with WMAP/PLANCK and LUX data for sfermion
coannihilations. The LUX data itself excludes the region of 450 to 600 GeV, by
a half order of magnitude of the cross-section, well below the associated
uncertainty. The similar combined lower limit for a wino DM is about 1.1 TeV.
There is hardly any collider bound from the LHC for squarks and sleptons in
such a compressed scenario where sfermion masses are close to the mass of a
higgsino/wino LSP.Comment: Modified version with added explanations, with no essential change in
results or conclusion. 39 pages, 12 figures, 1 tabl | How light a higgsino or a wino dark matter can become in a compressed
scenario of MSSM | how light a higgsino or a wino dark matter can become in a compressed scenario of mssm | higgsinos wino motivations candidates supersymmetry annihilation large. setup higgsinos wino respectively. candidates slepton coannihilation annihilation section. reduces relic satisfied squark coannihilations. contrary degeneracy squarks higgsino generic coannihilations relic extending masses. indirect signals. quasi degeneracy squarks come squark diagrams higgsino wmap planck sfermion coannihilations. excludes uncertainty. wino tev. hardly collider squarks sleptons compressed sfermion higgsino wino explanations conclusion. pages tabl | non_dup | [] |
83861171 | 10.1007/JHEP09(2017)066 | We generalize, in a manifestly Weyl-invariant way, our previous expressions
for irregular singularity wave functions in two-dimensional SU(2) q-deformed
Yang-Mills theory to SU(N). As an application, we give closed-form expressions
for the Schur indices of all (A_{N-1}, A_{N(n-1)-1}) Argyres-Douglas (AD)
superconformal field theories (SCFTs), thus completing the computation of these
quantities for the (A_N, A_M) SCFTs. With minimal effort, our wave functions
also give new Schur indices of various infinite sets of "Type IV" AD theories.
We explore the discrete symmetries of these indices and also show how highly
intricate renormalization group (RG) flows from isolated theories and conformal
manifolds in the ultraviolet to isolated theories and (products of) conformal
manifolds in the infrared are encoded in these indices. We compare our flows
with dimensionally reduced flows via a simple "monopole vev RG" formalism.
Finally, since our expressions are given in terms of concise Lie algebra data,
we speculate on extensions of our results that might be useful for probing the
existence of hypothetical SCFTs based on other Lie algebras. We conclude with a
discussion of some open problems.Comment: 34 pages, 2 figure | On Irregular Singularity Wave Functions and Superconformal Indices | on irregular singularity wave functions and superconformal indices | generalize manifestly weyl expressions irregular singularity deformed mills expressions schur indices argyres douglas superconformal scfts completing quantities scfts. effort schur indices infinite theories. explore symmetries indices intricate renormalization flows conformal manifolds ultraviolet conformal manifolds infrared encoded indices. flows dimensionally flows monopole formalism. expressions concise speculate extensions probing hypothetical scfts algebras. pages | non_dup | [] |
73440951 | 10.1007/JHEP09(2017)067 | We study three-dimensional supersymmetric quiver gauge theories with a
non-simply laced global symmetry primarily focusing on framed affine $B_{N}$
quiver theories. Using a supersymmetric partition function on a three sphere,
and its transformation under S-duality, we study the three-dimensional ADHM
quiver for $SO(2N+1)$ instantons with a half-integer Chern-Simons coupling. The
theory after S-duality has no Lagrangian, and can not be represented by a
single quiver, however its partition function can be conveniently described by
a collection of framed affine ${B}_{N}$ quivers. This correspondence can be
conjectured to generalize three-dimensional mirror symmetry to theories with
nontrivial Chern-Simons terms. In addition, we propose a formula for the
superconformal index of a theory described by a framed affine $B_N$ quiver.Comment: 39 pages, 7 figure | On Three-Dimensional Quiver Gauge Theories of Type B | on three-dimensional quiver gauge theories of type b | supersymmetric quiver laced primarily focusing framed affine quiver theories. supersymmetric partition sphere duality adhm quiver instantons integer chern simons coupling. duality lagrangian quiver partition conveniently framed affine quivers. correspondence conjectured generalize mirror nontrivial chern simons terms. propose superconformal framed affine pages | non_dup | [] |
83846922 | 10.1007/JHEP09(2017)069 | The Higgs self-coupling is notoriously intangible at the LHC. It was recently
proposed to probe the trilinear Higgs interaction through its radiative
corrections to single-Higgs processes. This approach however requires to
disentangle these effects from those associated to deviations of other
Higgs-couplings to fermions and gauge bosons. We show that a global fit
exploiting only single-Higgs inclusive data suffers from degeneracies that
prevent one from extracting robust bounds on each individual coupling. We show
how the inclusion of double-Higgs production via gluon fusion, and the use of
differential measurements in the associated single-Higgs production channels
WH, ZH and ttH, can help to overcome the deficiencies of a global
Higgs-couplings fit. In particular, we bound the variations of the Higgs
trilinear self-coupling relative to its SM value to the interval [0.1, 2.3] at
68% confidence level at the high-luminosity LHC, and we discuss the robustness
of our results against various assumptions on the experimental uncertainties
and the underlying new physics dynamics. We also study how to obtain a
parametrically enhanced deviation of the Higgs self-couplings and we estimate
how large this deviation can be in a self-consistent effective field theory
framework.Comment: 41 pages, 6 figures; v2: comments and references added, minor typos
corrected, matches published versio | A global view on the Higgs self-coupling | a global view on the higgs self-coupling | notoriously intangible lhc. trilinear radiative processes. disentangle deviations couplings fermions bosons. exploiting inclusive suffers degeneracies prevent extracting robust bounds coupling. inclusion gluon fusion overcome deficiencies couplings fit. trilinear confidence luminosity robustness assumptions dynamics. parametrically couplings pages comments minor typos corrected matches versio | non_dup | [] |
73960610 | 10.1007/JHEP09(2017)070 | We find new universal factorization identities for generalized Macdonald
polynomials on the topological locus. We prove the identities (which include
all previously known forumlas of this kind) using factorization identities for
matrix model averages, which are themselves consequences of Ding-Iohara-Miki
constraints. Factorized expressions for generalized Macdonald polynomials are
identified with refined topological string amplitudes containing a toric brane
on an intermediate preferred leg, surface operators in gauge theory and certain
degenerate CFT vertex operators.Comment: 14 pages, 6 figures, typos corrected, missing figure and references
adde | Refined toric branes, surface operators and factorization of generalized
Macdonald polynomials | refined toric branes, surface operators and factorization of generalized macdonald polynomials | universal factorization identities macdonald polynomials topological locus. identities forumlas kind factorization identities averages consequences ding iohara miki constraints. factorized expressions macdonald polynomials refined topological amplitudes toric brane preferred degenerate pages typos corrected missing adde | non_dup | [] |
84329620 | 10.1007/JHEP09(2017)071 | In this paper, we study the finite-temperature matrix quantum mechanics with
chemical potential term linear in the single trace of U(N) matrices, via Monte
Carlo simulation. In the bosonic case, we exhibit the existence of the
Gross-Witten-Wadia (GWW) type third-order phase transition. We also extend our
studies to the model with the fermionic degrees of freedom employing the
non-lattice simulation via Fourier expansion, and explore the possibilities
that there is a phase transition between the gapped and ungapped phase both in
the absence and presence of the chemical potential term. We make a comparison
of the phase diagram between the bosonic and fermionic cases.Comment: 20 pages, 28 figures, v2: some minor typos correcte | Phase Transitions of a (Super) Quantum Mechanical Matrix Model with a
Chemical Potential | phase transitions of a (super) quantum mechanical matrix model with a chemical potential | mechanics trace monte carlo simulation. bosonic exhibit gross witten wadia transition. extend fermionic freedom employing fourier explore possibilities gapped ungapped term. bosonic fermionic pages minor typos correcte | non_dup | [] |
83832544 | 10.1007/JHEP09(2017)072 | The EFT coefficients in any gapped, scalar, Lorentz invariant field theory
must satisfy positivity requirements if there is to exist a local, analytic
Wilsonian UV completion. We apply these bounds to the tree level scattering
amplitudes for a massive Galileon. The addition of a mass term, which does not
spoil the non-renormalization theorem of the Galileon and preserves the
Galileon symmetry at loop level, is necessary to satisfy the lowest order
positivity bound. We further show that a careful choice of successively higher
derivative corrections are necessary to satisfy the higher order positivity
bounds. There is then no obstruction to a local UV completion from
considerations of tree level 2-to-2 scattering alone. To demonstrate this we
give an explicit example of such a UV completion.Comment: 31 page | Massive Galileon Positivity Bounds | massive galileon positivity bounds | gapped lorentz satisfy positivity analytic wilsonian completion. bounds amplitudes massive galileon. spoil renormalization galileon preserves galileon satisfy positivity bound. careful successively satisfy positivity bounds. obstruction completion considerations alone. | non_dup | [] |
84326587 | 10.1007/JHEP09(2017)073 | The soft anomalous dimension governs the infrared singularities of scattering
amplitudes to all orders in perturbative quantum field theory, and is a crucial
ingredient in both formal and phenomenological applications of non-abelian
gauge theories. It has recently been computed at three-loop order for massless
partons by explicit evaluation of all relevant Feynman diagrams. In this paper,
we show how the same result can be obtained, up to an overall numerical factor,
using a bootstrap procedure. We first give a geometrical argument for the fact
that the result can be expressed in terms of single-valued harmonic
polylogarithms. We then use symmetry considerations as well as known properties
of scattering amplitudes in collinear and high-energy (Regge) limits to
constrain an ansatz of basis functions. This is a highly non-trivial
cross-check of the result, and our methods pave the way for greatly simplified
higher-order calculations.Comment: 37 pages, 1 figur | Bootstrapping the QCD soft anomalous dimension | bootstrapping the qcd soft anomalous dimension | anomalous governs infrared singularities amplitudes orders perturbative crucial ingredient formal phenomenological abelian theories. massless partons feynman diagrams. bootstrap procedure. geometrical argument valued harmonic polylogarithms. considerations amplitudes collinear regge constrain ansatz functions. trivial check pave greatly simplified pages figur | non_dup | [] |
83862948 | 10.1007/JHEP09(2017)074 | Recently two of the authors proposed a mechanism of vacuum energy sequester
as a means of protecting the observable cosmological constant from quantum
radiative corrections. The original proposal was based on using global Lagrange
multipliers, but later a local formulation was provided. Subsequently other
interesting claims of a different non-local approach to the cosmological
constant problem were made, based again on global Lagrange multipliers. We
examine some of these proposals and find their mutual relationship. We explain
that the proposals which do not treat the cosmological constant counterterm as
a dynamical variable require fine tunings to have acceptable solutions.
Furthermore, the counterterm often needs to be retuned at every order in the
loop expansion to cancel the radiative corrections to the cosmological
constant, just like in standard GR. These observations are an important
reminder of just how the proposal of vacuum energy sequester avoids such
problems.Comment: 18 pages LaTe | An Etude on Global Vacuum Energy Sequester | an etude on global vacuum energy sequester | sequester protecting observable cosmological radiative corrections. proposal lagrange multipliers formulation provided. subsequently claims cosmological lagrange multipliers. examine proposals mutual relationship. proposals treat cosmological counterterm fine tunings acceptable solutions. counterterm retuned cancel radiative cosmological reminder proposal sequester avoids pages | non_dup | [] |
83851484 | 10.1007/JHEP09(2017)076 | We propose a systematic programme to search for long-lived neutral particle
signatures through a minimal set of displaced searches requiring significant
missing transverse energy (dMETs).
Our approach is to extend the well-established dark matter simplified models
to include displaced vertices. The dark matter simplified models are used to
describe the primary production vertex. A displaced secondary vertex,
characterised by the mass of the long-lived particle and its lifetime, is added
for the displaced signature. We show how these models can be motivated by, and
mapped onto, complete models such as gauge-mediated SUSY breaking and models of
neutral naturalness. We also outline how this approach may be used to extend
other simplified models to incorporate displaced signatures and to characterise
searches for long-lived charged particles. Displaced vertices are a striking
signature with virtually no backgrounds from SM processes, and thus provide an
excellent target for the high-luminosity run of the Large Hadron Collider. The
proposed models and searches provide a first step towards a systematic
broadening of the displaced dark matter search programme | Simplified Models for Displaced Dark Matter Signatures | simplified models for displaced dark matter signatures | propose programme lived neutral signatures displaced searches requiring missing dmets extend simplified displaced vertices. simplified vertex. displaced characterised lived lifetime displaced signature. motivated mapped susy breaking neutral naturalness. outline extend simplified incorporate displaced signatures characterise searches lived particles. displaced striking signature virtually backgrounds excellent luminosity hadron collider. searches broadening displaced programme | non_dup | [] |
83833155 | 10.1007/JHEP09(2017)078 | Conformal theory correlators are characterized by the spectrum and three-
point functions of local operators. We present a formula which extracts this
data as an analytic function of spin. In analogy with a classic formula due to
Froissart and Gribov, it is sensitive only to an "imaginary part" which appears
after analytic continuation to Lorentzian signature, and it converges thanks to
recent bounds on the high-energy Regge limit. At large spin, substituting in
cross-channel data, the formula yields 1/J expansions with controlled errors.
In large-N theories, the imaginary part is saturated by single-trace operators.
For a sparse spectrum, it manifests the suppression of bulk higher-derivative
interactions that constitutes the signature of a local gravity dual in
Anti-de-Sitter space.Comment: 33+12 pages, 6 figures. Typos fixed, published versio | Analyticity in Spin in Conformal Theories | analyticity in spin in conformal theories | conformal correlators operators. extracts analytic spin. analogy classic froissart gribov imaginary analytic continuation lorentzian signature converges thanks bounds regge limit. substituting expansions errors. imaginary saturated trace operators. sparse manifests suppression constitutes signature sitter pages figures. typos versio | non_dup | [] |
73397340 | 10.1007/JHEP09(2017)079 | For systems of unstable particles that mix with each other, an approximation
of the fully momentum-dependent propagator matrix is presented in terms of a
sum of simple Breit-Wigner propagators that are multiplied with finite on-shell
wave function normalisation factors. The latter are evaluated at the complex
poles of the propagators. The pole structure of general propagator matrices is
carefully analysed, and it is demonstrated that in the proposed approximation
imaginary parts arising from absorptive parts of loop integrals are properly
taken into account. Applying the formalism to the neutral MSSM Higgs sector
with complex parameters, very good numerical agreement is found between cross
sections based on the full propagators and the corresponding cross sections
based on the described approximation. The proposed approach does not only
technically simplify the treatment of propagators with non-vanishing
off-diagonal contributions, it is shown that it can also facilitate an improved
theoretical prediction of the considered observables via a more precise
implementation of the total widths of the involved particles. It is also
well-suited for the incorporation of interference effects arising from
overlapping resonances.Comment: 44 pages, 13 figures; v2: matches the version to appear in JHEP,
extended discussion of uncertainty estimate and gauge dependenc | Breit-Wigner approximation for propagators of mixed unstable states | breit-wigner approximation for propagators of mixed unstable states | unstable propagator breit wigner propagators multiplied normalisation factors. poles propagators. pole propagator carefully analysed imaginary arising absorptive integrals properly account. formalism neutral mssm propagators approximation. technically simplify propagators vanishing diagonal facilitate observables precise widths particles. suited incorporation interference arising overlapping pages matches jhep dependenc | non_dup | [] |
83863008 | 10.1007/JHEP09(2017)080 | Theories with more than one vacuum allow quantum transitions between them,
which may proceed via bubble nucleation; theories with more than two vacua
posses additional decay modes in which the wall of a bubble may further decay.
The instantons which mediate such a process have $O(3)$ symmetry (in four
dimensions, rather than the usual $O(4)$ symmetry of homogeneous vacuum decay),
and have been called `barnacles'; previously they have been studied in flat
space, in the thin wall limit, and this paper extends the analysis to include
gravity. It is found that there are regions of parameter space in which, given
an initial bubble, barnacles are the favoured subsequent decay process, and
that the inclusion of gravity can enlarge this region. The relation to other
heterogeneous vacuum decay scenarios, as well as some of the phenomenological
implications of barnacles are briefly discussed.Comment: 31 pages, 11 figure | Barnacles and Gravity | barnacles and gravity | proceed bubble nucleation vacua posses bubble decay. instantons mediate usual homogeneous barnacles extends gravity. bubble barnacles favoured inclusion enlarge region. heterogeneous scenarios phenomenological barnacles briefly pages | non_dup | [] |
73365978 | 10.1007/JHEP09(2017)081 | According to a recent classification of 6d (1,0) theories within F-theory
there are only six "pure" 6d gauge theories which have a UV superconformal
fixed point. The corresponding gauge groups are $SU(3),SO(8),F_4,E_6,E_7$, and
$E_8$. These exceptional models have BPS strings which are also instantons for
the corresponding gauge groups. For $G$ simply-laced, we determine the 2d
$\mathcal{N}=(0,4)$ worldsheet theories of such BPS instanton strings by a
simple geometric engineering argument. These are given by a twisted $S^2$
compactification of the 4d $\mathcal{N}=2$ theories of type $H_2, D_4, E_6,
E_7$ and $E_8$ (and their higher rank generalizations), where the 6d instanton
number is mapped to the rank of the corresponding 4d SCFT. This determines
their anomaly polynomials and, via topological strings, establishes an
interesting relation among the corresponding $T^2 \times S^2$ partition
functions and the Hilbert series for moduli spaces of $G$ instantons. Such
relations allow to bootstrap the corresponding elliptic genera by modularity.
As an example of such procedure, the elliptic genera for a single instanton
string are determined. The same method also fixes the elliptic genus for case
of one $ F_4 $ instanton. These results unveil a rather surprising relation
with the Schur index of the corresponding 4d $\mathcal{N}=2$ models.Comment: 64 pages; v3: version to appear in JHE | On Exceptional Instanton Strings | on exceptional instanton strings | superconformal point. exceptional strings instantons groups. laced mathcal worldsheet instanton strings geometric argument. twisted compactification mathcal generalizations instanton mapped scft. determines anomaly polynomials topological strings establishes partition hilbert moduli instantons. bootstrap elliptic genera modularity. elliptic genera instanton determined. fixes elliptic genus instanton. unveil surprising schur mathcal pages | non_dup | [] |
83861092 | 10.1007/JHEP09(2017)082 | We show that the inclusion of higher curvature terms in the gravitational
action can lead to phase transitions and critical behaviour for charged black
branes. The higher curvature terms considered here belong to the recently
constructed generalized quasi-topological class [ArXiv: 1703.01631], which
possess a number of interesting properties, such as being ghost-free on
constant curvature backgrounds and non-trivial in four dimensions. We show that
critical behaviour is a generic feature of the black branes in all dimensions
$d \ge 4$, and contextualize the results with a review of the properties of
black branes in Lovelock and quasi-topological gravity, where critical
behaviour is not possible. These results may have interesting implications for
the CFTs dual to this class of theories.Comment: 31 pages, 6 figures. v2: minor typos corrected, references added;
updated to match published versio | Criticality for charged black branes | criticality for charged black branes | inclusion curvature gravitational branes. curvature belong quasi topological possess ghost curvature backgrounds trivial dimensions. generic branes contextualize branes lovelock quasi topological possible. cfts pages figures. minor typos corrected updated match versio | non_dup | [] |
84330121 | 10.1007/JHEP09(2017)085 | The presence of weak-scale colored top partners is among the simplest
solutions to the Higgs hierarchy problem and allows for a natural electroweak
scale. We examine the constraints on generic colored top partners coming solely
from their effect on the production and decay rates of the observed Higgs with
a mass of 125 GeV. We use the latest Higgs precision data from the Tevatron and
the LHC as of EPS 2017 to derive the current limits on spin-0, spin-1/2, and
spin-1 colored top partners. We also investigate the expected sensitivity from
the Run 3 and Run 4 of the LHC, as well from possible future electron-positron
and proton-proton colliders, including the ILC, CEPC, FCC-ee, and FCC-hh. We
discuss constraints on top partners in the Minimal Supersymmetric Standard
Model and Little Higgs theories. We also consider various model-building
aspects--multiple top partners, modified couplings between the Higgs and
Standard-Model particles, and non-Standard-Model Higgs sectors--and evaluate
how these weaken the current limits and expected sensitivities. By modifying
other Standard-Model Higgs couplings, we find that the best way to hide
low-mass top partners from current data is through modifications of the
top-Yukawa coupling, although future measurements of top-quark-pair production
in association with a Higgs will extensively probe this possibility. We also
demonstrate that models with multiple top partners can generically avoid
current and future Higgs precision measurements. Nevertheless, some of the
model parameter space can be probed with precision measurements at future
electron-positron colliders of, for example, the e+ e- -> Zh cross section.Comment: 34 pages + appendices and references, 14 figures; added reference | Higgs-Precision Constraints on Colored Naturalness | higgs-precision constraints on colored naturalness | colored partners simplest hierarchy electroweak scale. examine generic colored partners coming solely gev. latest precision tevatron derive colored partners. positron proton proton colliders cepc partners supersymmetric theories. partners couplings sectors weaken sensitivities. modifying couplings hide partners modifications yukawa extensively possibility. partners generically avoid precision measurements. nevertheless probed precision positron colliders pages appendices | non_dup | [] |
84332088 | 10.1007/JHEP09(2017)086 | We present a formula for the information metric on $\mathbb{R} \times
{S}^{d-1}$ for a scalar primary operator of integral dimension $\Delta \, (\,\,
> \frac{d+1}{2})$. This formula is checked for various space-time dimensions
$d$ and $\Delta$ in the field theory side. We check the formula in the gravity
side using the holographic setup. We clarify the regularization and
renormalization involved in these computations. We also show that the quantum
information metric of an exactly marginal operator agrees with the leading
order of the interface free energy of the conformal Janus on Euclidean ${S}^d$,
which is checked for $d=2, 3$.Comment: 21 pages, 2 figure | Quantum Information Metric on $\mathbb{R} \times S^{d-1}$ | quantum information metric on $\mathbb{r} \times s^{d-1}$ | mathbb delta frac checked delta side. check holographic setup. clarify regularization renormalization computations. marginal agrees conformal janus euclidean checked .comment pages | non_dup | [] |
83868989 | 10.1007/JHEP09(2017)087 | Using the chiral algebra bootstrap, we revisit the simplest Argyres-Douglas
(AD) generalization of Argyres-Seiberg S-duality. We argue that the exotic AD
superconformal field theory (SCFT), $T_{3,{3\over2}}$, emerging in this duality
splits into a free piece and an interacting piece, T_X, even though this
factorization seems invisible in the Seiberg-Witten (SW) curve derived from the
corresponding M5-brane construction. Without a Lagrangian, an associated
topological field theory, a BPS spectrum, or even an SW curve, we nonetheless
obtain exact information about T_X by bootstrapping its chiral algebra,
chi(T_X), and finding the corresponding vacuum character in terms of Affine
Kac-Moody characters. By a standard 4D/2D correspondence, this result gives us
the Schur index for T_X and, by studying this quantity in the limit of small
S^1, we make contact with a proposed S^1 reduction. Along the way, we discuss
various properties of T_X: as an N=1 theory, it has flavor symmetry
SU(3)XSU(2)XU(1), the central charge of chi(T_X) matches the central charge of
the bc ghosts in bosonic string theory, and its global SU(2) symmetry has a
Witten anomaly. This anomaly does not prevent us from building conformal
manifolds out of arbitrary numbers of T_X theories (giving us a surprisingly
close AD relative of Gaiotto's T_N theories), but it does lead to some open
questions in the context of the chiral algebra / 4D N=2 SCFT correspondence.Comment: 30+10 pages; 4 appendices; 6 figure | N=2 S-duality Revisited | n=2 s-duality revisited | chiral bootstrap revisit simplest argyres douglas generalization argyres seiberg duality. argue exotic superconformal scft emerging duality splits piece interacting piece factorization invisible seiberg witten brane construction. lagrangian topological nonetheless bootstrapping chiral character affine moody characters. correspondence schur studying quantity reduction. flavor matches ghosts bosonic witten anomaly. anomaly prevent conformal manifolds giving surprisingly gaiotto chiral scft pages appendices | non_dup | [] |
83853462 | 10.1007/JHEP09(2017)088 | A search for new phenomena in final states characterized by high jet
multiplicity, an isolated lepton (electron or muon) and either zero or at least
three $b$-tagged jets is presented. The search uses 36.1 fb$^{-1}$ of
$\sqrt{s}$ = 13 TeV proton-proton collision data collected by the ATLAS
experiment at the Large Hadron Collider in 2015 and 2016. The dominant sources
of background are estimated using parameterized extrapolations, based on
observables at medium jet multiplicity, to predict the $b$-tagged jet
multiplicity distribution at the higher jet multiplicities used in the search.
No significant excess over the Standard Model expectation is observed and 95%
confidence-level limits are extracted constraining four simplified models of
$R$-parity-violating supersymmetry that feature either gluino or top-squark
pair production. The exclusion limits reach as high as 2.1 TeV in gluino mass
and 1.2 TeV in top-squark mass in the models considered. In addition, an upper
limit is set on the cross-section for Standard Model $t\bar{t}t\bar{t}$
production of 60 fb (6.5 $\times$ the Standard Model prediction) at 95%
confidence level. Finally, model-independent limits are set on the contribution
from new phenomena to the signal-region yields.Comment: 51 pages in total, author list starting page 35, 10 figures, 5
tables, submitted to JHEP. All figures including auxiliary figures are
available at
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-11 | Search for new phenomena in a lepton plus high jet multiplicity final
state with the ATLAS experiment using $\sqrt{s}$ = 13 Tev proton-proton
collision data | search for new phenomena in a lepton plus high jet multiplicity final state with the atlas experiment using $\sqrt{s}$ = 13 tev proton-proton collision data | phenomena multiplicity lepton muon tagged jets presented. sqrt proton proton collision atlas hadron collider parameterized extrapolations observables multiplicity predict tagged multiplicity multiplicities search. excess expectation confidence constraining simplified parity violating supersymmetry gluino squark production. exclusion gluino squark considered. confidence level. phenomena pages tables submitted jhep. auxiliary | non_dup | [] |
83861698 | 10.1007/JHEP09(2017)089 | Recently, a nilpotent real scalar superfield $V$ was introduced in
arXiv:1702.02423 as a model for the Goldstino. It contains only two independent
component fields, the Goldstino and the auxiliary $D$-field. Here we first show
that $V$ can equivalently be realised as a constrained three-form superfield.
We demonstrate that every irreducible Goldstino superfield (of which the
Goldstino is the only independent component field) can be realised as a
descendant of $V$ which is invariant under local rescalings $V \to {\rm e}^\tau
V$, where $\tau$ is an arbitrary real scalar superfield. We next propose a new
Goldstino supermultiplet which is described by a nilpotent three-form
superfield $\cal Y$ that is a variant formulation for the nilpotent chiral
superfield, which is often used in off-shell models for spontaneously broken
supergravity. It is shown that the action describing the dynamics of $\cal Y$
may be obtained from a supersymmetric nonlinear $\sigma$-model in the infrared
limit. Unlike $V$, the Goldstino superfield $\cal Y$ contains two independent
auxiliary fields, $F= H+{\rm i} G$, of which $H$ is a scalar and $G$ is the
field strength of a gauge three-form. When $\cal Y$ is coupled to supergravity,
both $H$ and $G$ produce positive contributions to the cosmological constant.
While the contribution from $H$ is uniquely determined by the parameter of the
supersymmetry breaking in the action, the contribution from $G$ is dynamical.Comment: 18 pages; minor correction | Three-form multiplet and supersymmetry breaking | three-form multiplet and supersymmetry breaking | nilpotent superfield goldstino. goldstino auxiliary field. equivalently realised constrained superfield. irreducible goldstino superfield goldstino realised descendant rescalings superfield. propose goldstino supermultiplet nilpotent superfield variant formulation nilpotent chiral superfield spontaneously broken supergravity. describing supersymmetric sigma infrared limit. unlike goldstino superfield auxiliary form. supergravity cosmological constant. uniquely supersymmetry breaking pages minor | non_dup | [] |
83852418 | 10.1007/JHEP09(2017)090 | Recently we have proved factorization of infrared divergences in NRQCD S-wave
heavy quarkonium production at high energy colliders at all orders in coupling
constant. One of the problem which still exists in the higher order pQCD
calculation of color singlet P-wave heavy quarkonium production/anihillation is
the appearance of non-canceling infrared divergences due to real soft gluons
exchange, although no such infrared divergences are present in the color
singlet S-wave heavy quarkonium. In this paper we find that since the
non-perturbative matrix element of the color singlet P-wave heavy quarkonium
production contains derivative operators, the gauge links are necessary to make
it gauge invariant and be consistent with the factorization of such
non-canceling infrared divergences at all orders in coupling constant.Comment: 18 pages latex, Final Version, Accepted for Publication in JHE | Correct Definition of Color Singlet P-Wave Non-Perturbative Matrix
Element of Heavy Quarkonium Production | correct definition of color singlet p-wave non-perturbative matrix element of heavy quarkonium production | proved factorization infrared divergences nrqcd quarkonium colliders orders constant. pqcd singlet quarkonium anihillation appearance canceling infrared divergences gluons infrared divergences singlet quarkonium. perturbative singlet quarkonium links factorization canceling infrared divergences orders pages latex publication | non_dup | [] |
84331995 | 10.1007/JHEP09(2017)091 | We investigate the correlation between a possible deviation in the discovered
Higgs boson $h(125)$ couplings from the Standard Model prediction and the mass
scale ($M_{\text{2nd}}$) of the next-to-lightest Higgs boson in models with
non-minimal Higgs sectors. In particular, we comprehensively study a class of
next-to-minimal Higgs sectors which satisfy the electroweak $\rho$ parameter to
be one at tree level. We derive an upper limit on $M_{\text{2nd}}$ by imposing
bounds from perturbative unitarity, vacuum stability, triviality and
electroweak precision data as functions of the deviation in the $hVV$ ($V=W,Z$)
couplings. Furthermore, we discuss the complementarity between these bounds and
the current LHC data, e.g., by considering direct searches for additional Higgs
bosons and indirect constraints arising from the measured $h(125)$ signal
strengths.Comment: 37 pages, 36 figure | Extracting the mass scale of a second Higgs boson from a deviation in
$h(125)$ couplings | extracting the mass scale of a second higgs boson from a deviation in $h(125)$ couplings | discovered boson couplings lightest boson sectors. comprehensively sectors satisfy electroweak level. derive imposing bounds perturbative unitarity triviality electroweak precision couplings. complementarity bounds e.g. searches bosons indirect arising pages | non_dup | [] |
84090751 | 10.1007/JHEP09(2017)092 | Using E-strings, we can analyze not only six-dimensional superconformal field
theories but also probe vacua of non-perturabative heterotic string. We study
strings made of D3-branes wrapped on various two-cycles in the global F-theory
setup. We claim that E-strings are elementary in the sense that various
combinations of E-strings can form M-strings as well as heterotic strings and
new kind of strings, called G-strings. Using them, we show that emissions and
combinations of heterotic small instantons generate most of known
six-dimensional superconformal theories, their affinizations and little string
theories. Taking account of global structure of compact internal geometry, we
also show that special combinations of E-strings play an important role in
constructing six-dimensional theories of $D$- and $E$-types. We check global
consistency conditions from anomaly cancellation conditions, both from
five-branes and strings, and show that they are given in terms of elementary
E-string combinations.Comment: 58 pages, 16 figures; v2. version to appear in JHE | E(lementary) Strings in Six-Dimensional Heterotic F-Theory | e(lementary) strings in six-dimensional heterotic f-theory | strings analyze superconformal vacua perturabative heterotic string. strings branes wrapped cycles setup. claim strings elementary combinations strings strings heterotic strings kind strings strings. combinations heterotic instantons superconformal affinizations theories. combinations strings constructing types. check consistency anomaly cancellation branes strings elementary pages | non_dup | [] |
83848780 | 10.1007/JHEP09(2017)093 | We investigate the possible collider signatures of a new Higgs in simple
extensions of the Standard Model where baryon number is a local symmetry
spontaneously broken at the low scale. We refer to this new Higgs as "Baryonic
Higgs". This Higgs has peculiar properties since it can decay into all Standard
Model particles, the leptophobic gauge boson, and the vector-like quarks
present in these theories to ensure anomaly cancellation. We investigate in
detail the constraints from the $\gamma \gamma$, $Z \gamma$, $Z Z$, and $W W$
searches at the Large Hadron Collider, needed to find a lower bound on the
scale at which baryon number is spontaneously broken. The di-photon channel
turns out to be a very sensitive probe in the case of small scalar mixing and
can severely constrain the baryonic scale. We also study the properties of the
leptophobic gauge boson in order to understand the testability of these
theories at the LHC.Comment: 20 pages, 9 figures; minor corrections, to appear in JHE | Baryonic Higgs at the LHC | baryonic higgs at the lhc | collider signatures extensions baryon spontaneously broken scale. baryonic peculiar leptophobic boson quarks ensure anomaly cancellation. gamma gamma gamma searches hadron collider baryon spontaneously broken. turns severely constrain baryonic scale. leptophobic boson testability pages minor | non_dup | [] |
83859428 | 10.1007/JHEP09(2017)094 | The Standard Model of particle physics requires Yukawa matrices with
eigenval- ues that differ by orders of magnitude. We propose a novel way to
explain this fact without any small or large parameters. The mechanism is based
on the observation that products of matrices of random order one-numbers have
hierarchical spectra. The same mechanism can easily account for the
hierarchical structure of the quark mixing matrix.Comment: 9 pages. v2: Extended and improved discussion on CKM matrix.
References added. Matches published versio | Natural Fermion Hierarchies from Random Yukawa Couplings | natural fermion hierarchies from random yukawa couplings | yukawa eigenval orders magnitude. propose parameters. hierarchical spectra. hierarchical pages. matrix. added. matches versio | non_dup | [] |
74203421 | 10.1007/JHEP09(2017)096 | In this paper we further develop the fluctuating hydrodynamics proposed in
arXiv:1511.03646 in a number of ways. We first work out in detail the classical
limit of the hydrodynamical action, which exhibits many simplifications. In
particular, this enables a transparent formulation of the action in physical
spacetime in the presence of arbitrary external fields. It also helps to
clarify issues related to field redefinitions and frame choices. We then
propose that the action is invariant under a $Z_2$ symmetry to which we refer
as the dynamical KMS symmetry. The dynamical KMS symmetry is physically
equivalent to the previously proposed local KMS condition in the classical
limit, but is more convenient to implement and more general. It is applicable
to any states in local equilibrium rather than just thermal density matrix
perturbed by external background fields. Finally we elaborate the formulation
for a conformal fluid, which contains some new features, and work out the
explicit form of the entropy current to second order in derivatives for a
neutral conformal fluid.Comment: 49+8 pages, 1 figure. v2: references added, minor clarification | Effective field theory for dissipative fluids (II): classical limit,
dynamical KMS symmetry and entropy current | effective field theory for dissipative fluids (ii): classical limit, dynamical kms symmetry and entropy current | fluctuating hydrodynamics ways. hydrodynamical exhibits simplifications. enables transparent formulation spacetime fields. helps clarify redefinitions choices. propose symmetry. physically convenient implement general. applicable perturbed fields. elaborate formulation conformal derivatives neutral conformal pages figure. minor clarification | non_dup | [] |
73388442 | 10.1007/JHEP09(2017)097 | What is the meaning of entanglement in a theory of extended objects such as
strings? To address this question we consider the spatial entanglement between
two intervals in the Gross-Taylor model, the string theory dual to
two-dimensional Yang-Mills theory at large $N$. The string diagrams that
contribute to the entanglement entropy describe open strings with endpoints
anchored to the entangling surface, as first argued by Susskind. We develop a
canonical theory of these open strings, and describe how closed strings are
divided into open strings at the level of the Hilbert space. We derive the
Modular hamiltonian for the Hartle-Hawking state and show that the
corresponding reduced density matrix describes a thermal ensemble of open
strings ending on an object at the entangling surface that we call an E-brane.Comment: 37 pages, 12 figures. v3: Modified title and abstrac | Entanglement branes in a two-dimensional string theory | entanglement branes in a two-dimensional string theory | meaning entanglement strings entanglement intervals gross taylor mills diagrams entanglement strings endpoints anchored entangling argued susskind. canonical strings strings divided strings hilbert space. derive modular hartle hawking describes ensemble strings ending entangling call pages figures. title abstrac | non_dup | [] |
84093939 | 10.1007/JHEP09(2017)099 | We provide a systematic renormalization group formalism for the mass effects
in the relation of the pole mass $m_Q^{\rm pole}$ and short-distance masses
such as the $\overline{\rm MS}$ mass $\overline{m}_Q$ of a heavy quark $Q$,
coming from virtual loop insertions of massive quarks lighter than $Q$. The
formalism reflects the constraints from heavy quark symmetry and entails a
combined matching and evolution procedure that allows to disentangle and
successively integrate out the corrections coming from the lighter massive
quarks and the momentum regions between them and to precisely control the large
order asymptotic behavior. With the formalism we systematically sum logarithms
of ratios of the lighter quark masses and $m_Q$, relate the QCD corrections for
different external heavy quarks to each other, predict the ${\cal
O}(\alpha_s^4)$ virtual quark mass corrections in the pole-$\overline{\rm MS}$
mass relation, calculate the pole mass differences for the top, bottom and
charm quarks with a precision of around $20$ MeV and analyze the decoupling of
the lighter massive quark flavors at large orders. The summation of logarithms
is most relevant for the top quark pole mass $m_t^{\rm pole}$, where the
hierarchy to the bottom and charm quarks is large. We determine the ambiguity
of the pole mass for top, bottom and charm quarks in different scenarios with
massive or massless bottom and charm quarks in a way consistent with heavy
quark symmetry, and we find that it is $250$ MeV. The ambiguity is larger than
current projections for the precision of top quark mass measurements in the
high-luminosity phase of the LHC.Comment: 45 pages + appendix, 6 figures, v2: journal versio | On the Light Massive Flavor Dependence of the Large Order Asymptotic
Behavior and the Ambiguity of the Pole Mass | on the light massive flavor dependence of the large order asymptotic behavior and the ambiguity of the pole mass | renormalization formalism pole pole overline overline coming virtual insertions massive quarks lighter formalism reflects entails matching disentangle successively integrate coming lighter massive quarks precisely asymptotic behavior. formalism systematically logarithms lighter relate quarks predict alpha virtual pole overline pole charm quarks precision analyze decoupling lighter massive flavors orders. summation logarithms pole pole hierarchy charm quarks large. ambiguity pole charm quarks scenarios massive massless charm quarks mev. ambiguity projections precision luminosity pages versio | non_dup | [] |
83860442 | 10.1007/JHEP09(2017)100 | We propose an alternative evaluation of quantum entanglement by measuring the
maximum violation of the Bell's inequality without performing a partial trace
operation. This proposal is demonstrated by bridging the maximum violation of
the Bell's inequality and the concurrence of a pure state in an $n$-qubit
system, in which one subsystem only contains one qubit and the state is a
linear combination of two product states. We apply this relation to the ground
states of four qubits in the Wen-Plaquette model and show that they are
maximally entangled. A topological entanglement entropy of the Wen-Plaquette
model could be obtained by relating the upper bound of the maximum violation of
the Bell's inequality to the concurrences of a pure state with respect to
different bipartitions.Comment: 10 page | Bell's Inequality and Entanglement in Qubits | bell's inequality and entanglement in qubits | propose entanglement measuring violation bell inequality performing trace operation. proposal bridging violation bell inequality concurrence qubit subsystem qubit states. qubits plaquette maximally entangled. topological entanglement plaquette relating violation bell inequality concurrences | non_dup | [] |
84092456 | 10.1007/JHEP09(2017)101 | We analyze the collider sensitivity for new colored resonances in $t\bar{t}$,
$b \bar{b}$, and $jj$ final states. While searches in the single production
channel are model-dependent, the pair production rate is model independent and
the existing $(JJ)(JJ)$ and $4t$ searches impose strong constraints on the
relevant branching fractions, where $J = j$ or $b$. We point out the missing,
complementary searches in the mixed decay modes, $t\bar{t}(jj)$,
$t\bar{t}(b\bar{b})$, and $(b\bar{b})(jj)$. We propose analysis strategies for
the $t\bar{t}(jj)$ and $t\bar{t}(b\bar{b})$ decays and find their sensivity
surpasses that of existing searches when the decay widths to tops and light
jets are comparable. If no other decays are present, collective lower limits on
the resonance mass can be set at 1.5~TeV using 37~fb$^{-1}$ of 13~TeV data.Comment: 22 pages, 3 figures, 2 table | Collider constraints and new tests of color octet vectors | collider constraints and new tests of color octet vectors | analyze collider colored resonances states. searches searches impose branching fractions missing complementary searches propose decays sensivity surpasses searches widths tops jets comparable. decays collective pages | non_dup | [] |
83842605 | 10.1007/JHEP09(2017)102 | We chart the breakdown of semiclassical gravity by analyzing the Virasoro
conformal blocks to high numerical precision, focusing on the heavy-light limit
corresponding to a light probe propagating in a BTZ black hole background. In
the Lorentzian regime, we find empirically that the initial exponential
time-dependence of the blocks transitions to a universal $t^{-\frac{3}{2}}$
power-law decay. For the vacuum block the transition occurs at $t \approx
\frac{\pi c}{6 h_L}$, confirming analytic predictions. In the Euclidean regime,
due to Stokes phenomena the naive semiclassical approximation fails completely
in a finite region enclosing the `forbidden singularities'. We emphasize that
limitations on the reconstruction of a local bulk should ultimately stem from
distinctions between semiclassical and exact correlators.Comment: 45 pages, 23 figure | A Numerical Approach to Virasoro Blocks and the Information Paradox | a numerical approach to virasoro blocks and the information paradox | chart breakdown semiclassical analyzing virasoro conformal blocks precision focusing propagating background. lorentzian empirically exponential blocks universal frac decay. approx frac confirming analytic predictions. euclidean stokes phenomena naive semiclassical fails enclosing forbidden singularities emphasize limitations reconstruction ultimately distinctions semiclassical pages | non_dup | [] |
73991876 | 10.1007/JHEP09(2017)103 | A covariant closed superstring field theory, equivalent to classical
ten-dimensional Type II supergravity, is presented. The defining conformal
field theory is the ambitwistor string worldsheet theory of Mason and Skinner.
This theory is known to reproduce the scattering amplitudes of Cachazo, He and
Yuan in which the scattering equations play an important role and the string
field theory naturally incorporates these results. We investigate the operator
formalism description of the ambitwsitor string and propose an action for the
string field theory of the bosonic and supersymmetric theories. The correct
linearised gauge symmetries and spacetime actions are explicitly reproduced and
evidence is given that the action is correct to all orders. The focus is on the
Neveu-Schwarz sector and the explicit description of tree level perturbation
theory about flat spacetime. Application of the string field theory to general
supergravity backgrounds and the inclusion of the Ramond sector are briefly
discussed.Comment: 57 pages. Published Versio | A Superstring Field Theory for Supergravity | a superstring field theory for supergravity | covariant superstring supergravity presented. defining conformal ambitwistor worldsheet mason skinner. reproduce amplitudes cachazo yuan naturally incorporates results. formalism ambitwsitor propose bosonic supersymmetric theories. linearised symmetries spacetime explicitly reproduced orders. neveu schwarz perturbation spacetime. supergravity backgrounds inclusion ramond briefly pages. versio | non_dup | [] |
73442410 | 10.1007/JHEP09(2017)105 | We estimate differential rapidity cross sections for $J/\Psi$, $\Psi(2S)$,
$\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ production via Pb-Pb
collisions at proton-proton energy $\equiv \sqrt{s_{pp}}$ =5.02 TeV. For the
$\Psi(2S)$, $\Upsilon(3S)$ states we use the mixed heavy quark hyrid theory,
with these states being approximately 50\% standard and 50\% hybrid charmonium,
bottomonium meson states. This is an extension of previous work on heavy quark
state production via Cu-Cu and Au-Au collisions at $\sqrt{s_{pp}}$=200 GeV.Comment: 7 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:1309.5374, arXiv:1411.368 | Heavy quark state production in Pb-Pb collisions at $\sqrt{s_{NN}}$=5.02
TeV | heavy quark state production in pb-pb collisions at $\sqrt{s_{nn}}$=5.02 tev | rapidity upsilon upsilon upsilon collisions proton proton equiv sqrt tev. upsilon hyrid hybrid charmonium bottomonium meson states. collisions sqrt pages figures. admin substantial overlap | non_dup | [] |
84093112 | 10.1007/JHEP09(2017)109 | Using non-relativistic effective Lagrangians in the particle-dimer picture,
we rederive the expression for the energy shift of a loosely bound
three-particle bound state of identical bosons in the unitary limit. The
effective field theory formalism allows us to investigate the role of the
three-particle force, which has not been taken into account in the earlier
treatment of the problem. Moreover, we are able to relax the requirement of the
unitary limit of infinite scattering length and demonstrate a smooth transition
from the weakly bound three-particle state to a two-particle bound state of a
particle and a deeply bound dimer.Comment: 24 pages, 3 figure | Three-particle quantization condition in a finite volume: 1. The role of
the three-particle force | three-particle quantization condition in a finite volume: 1. the role of the three-particle force | relativistic lagrangians dimer picture rederive loosely bosons unitary limit. formalism problem. relax requirement unitary infinite weakly deeply pages | non_dup | [] |
78508037 | 10.1007/JHEP09(2017)110 | A two-dimensional Sp($2N$) vector model with small $\mathcal{N}=4$
superconformal symmetry is formulated, and its chiral algebra is shown to be
generated by superprimary fields of even conformal weight. This vector model is
the large level limit of a coset theory with large $\mathcal{N}=4$, whose
proposed AdS$_3$ dual is a minimal Vasiliev higher spin theory with gauge
algebra generated by fields of even spin. The relation of this vector model to
the symmetric product orbifold, dual to tensionless strings in AdS$_3$ $\times$
S$^3$ $\times$ $\mathbb{T}^4$, is also worked out.Comment: Accepted for publication in JHEP; references added; comments added to
the introduction; details added to the final sectio | Even spin $\mathcal{N}=4$ holography | even spin $\mathcal{n}=4$ holography | mathcal superconformal formulated chiral superprimary conformal weight. coset mathcal vasiliev spin. orbifold tensionless strings mathbb worked publication jhep comments sectio | non_dup | [] |
73401066 | 10.1007/JHEP09(2017)111 | We conjecture a new way to construct eigenstates of integrable XXX quantum
spin chains with SU(N) symmetry. The states are built by repeatedly acting on
the vacuum with a single operator Bgood(u) evaluated at the Bethe roots. Our
proposal serves as a compact alternative to the usual nested algebraic Bethe
ansatz. Furthermore, the roots of this operator give the separated variables of
the model, explicitly generalizing Sklyanin's approach to the SU(N) case. We
present many tests of the conjecture and prove it in several special cases. We
focus on rational spin chains with fundamental representation at each site, but
expect many of the results to be valid more generally.Comment: 38 pages; v2: added proof for SU(2), minor corrections; v3: typos
fixed, references adde | New Construction of Eigenstates and Separation of Variables for SU(N)
Quantum Spin Chains | new construction of eigenstates and separation of variables for su(n) quantum spin chains | conjecture eigenstates integrable chains symmetry. built repeatedly acting bgood bethe roots. proposal serves usual nested algebraic bethe ansatz. roots separated explicitly generalizing sklyanin case. conjecture cases. rational chains valid pages minor typos adde | non_dup | [] |
84327475 | 10.1007/JHEP09(2017)112 | We investigate simplified models of new physics that can accommodate the
measured value of the anomalous magnetic moment of the muon and the relic
density of dark matter. We define a set of renormalizable, SU(2)$\times$U(1)
invariant extensions of the Standard Model, each comprising an inert $Z_2$-odd
scalar field and one or more vector-like pairs of colorless fermions that
communicate to the muons through Yukawa-type interactions. The new sectors are
classified according to their transformation properties under the Standard
Model gauge group and all models are systematically confronted with a variety
of experimental constraints: LEP mass bounds, direct LHC searches, electroweak
precision observables, and direct searches for dark matter. We show that
scenarios featuring only one type of new fermions become very predictive once
the relic density and collider constraints are taken into account, as in this
case $g-2$ is not enhanced by chirality flip. Conversely, for models where an
additional source of chiral-symmetry violation is generated via fermion mixing,
the constraints are much looser and new precision experiments with highly
suppressed systematic uncertainties may be required to test the parameter
space.Comment: 38 pages, 12 figures. Added constraints from CMS soft opposite-sign
leptons and ATLAS h to gamma gamma. References added, typos fixed. Matches
published versio | Expectations for the muon g-2 in simplified models with dark matter | expectations for the muon g-2 in simplified models with dark matter | simplified accommodate anomalous moment muon relic matter. renormalizable extensions comprising inert colorless fermions communicate muons yukawa interactions. sectors classified systematically confronted bounds searches electroweak precision observables searches matter. scenarios featuring fermions predictive relic collider chirality flip. conversely chiral violation fermion looser precision suppressed pages figures. opposite leptons atlas gamma gamma. typos fixed. matches versio | non_dup | [] |
83840519 | 10.1007/JHEP09(2017)113 | We study models in which the inflaton is coupled to two otherwise decoupled
sectors, and the effect of preheating and related processes on their energy
densities during the evolution of the universe. Over most of parameter space,
preheating is not disrupted by the presence of extra sectors, and even
comparatively weakly coupled sectors can get an order 1 fraction of the total
energy at this time. If two sectors are both preheated, the high number
densities could also lead to inflaton mediated thermalisation. If only one
sector is preheated, Bose enhancement of the late time inflaton decays may
cause significant deviations from the perturbative prediction for their
relative reheat temperatures. Meanwhile, in Non-Oscillatory inflation models
resonant effects can result in exponentially large final temperature
differences between sectors that have similar couplings to the inflaton.
Asymmetric reheating is potentially relevant for a range of beyond the Standard
Model physics scenarios. We show that in dark matter freeze-in models, hidden
sector temperatures a factor of 10 below that of the visible sector are
typically needed for the relic abundance to be set solely by freeze-in
dynamics.Comment: JHEP versio | Symmetric and Asymmetric Reheating | symmetric and asymmetric reheating | inflaton decoupled sectors preheating densities universe. preheating disrupted extra sectors comparatively weakly sectors time. sectors preheated densities inflaton thermalisation. preheated bose enhancement inflaton decays deviations perturbative reheat temperatures. meanwhile oscillatory inflation resonant exponentially sectors couplings inflaton. asymmetric reheating potentially scenarios. freeze hidden visible relic abundance solely freeze jhep versio | non_dup | [] |
83838625 | 10.1007/JHEP09(2017)114 | We propose a new variable, the charm fraction, for collider searches for new
physics. We analyze this variable in the context of searches for simplified
supersymmetry models with squarks, the gluino, and the bino, assuming that only
the lightest mass-degenerate squarks can be produced at the high-luminosity
LHC. The charm fraction complements event counting and kinematic information,
increasing the sensitivity of the searches for models with heavy gluinos, for
which squark production is flavor-blind. If squarks are discovered at the LHC,
this variable can help discriminate between different underlying models. In
particular, with improved charm tagging, the charm fraction can provide
information on the gluino mass, and in some scenarios, on whether this mass is
within the reach of a future 100 TeV hadron collider.Comment: 16 pages, 9 figures; double-tagging analysis added; discussion of
results expanded; version to appear in JHE | Tagging new physics with charm | tagging new physics with charm | propose charm collider searches physics. analyze searches simplified supersymmetry squarks gluino bino lightest degenerate squarks luminosity lhc. charm complements counting kinematic searches gluinos squark flavor blind. squarks discovered discriminate models. charm tagging charm gluino scenarios hadron pages tagging expanded | non_dup | [] |
84092796 | 10.1007/JHEP09(2017)115 | We study thermalization in the holographic (1+1)-dimensional CFT after
simultaneous generation of two high-energy excitations in the antipodal points
on the circle. The holographic picture of such quantum quench is the creation
of BTZ black hole from a collision of two massless particles. We perform
holographic computation of entanglement entropy and mutual information in the
boundary theory and analyze their evolution with time. We show that
equilibration of the entanglement in the regions which contained one of the
initial excitations is generally similar to that in other holographic quench
models, but with some important distinctions. We observe that entanglement
propagates along a sharp effective light cone from the points of initial
excitations on the boundary. The characteristics of entanglement propagation in
the global quench models such as entanglement velocity and the light cone
velocity also have a meaning in the bilocal quench scenario. We also observe
the loss of memory about the initial state during the equilibration process. We
find that the memory loss reflects on the time behavior of the entanglement
similarly to the global quench case, and it is related to the universal linear
growth of entanglement, which comes from the interior of the forming black
hole. We also analyze general two-point correlation functions in the framework
of the geodesic approximation, focusing on the study of the late time behavior.Comment: 75 pages, 41 figure, v2: typos corrected, references and minor
comments added, v3: published versio | Thermalization after holographic bilocal quench | thermalization after holographic bilocal quench | thermalization holographic simultaneous excitations antipodal circle. holographic picture quench creation collision massless particles. holographic entanglement mutual analyze time. equilibration entanglement excitations holographic quench distinctions. entanglement propagates sharp cone excitations boundary. entanglement propagation quench entanglement cone meaning bilocal quench scenario. equilibration process. reflects entanglement quench universal entanglement comes interior forming hole. analyze geodesic focusing pages typos corrected minor comments versio | non_dup | [] |