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86420214 | 10.1007/JHEP10(2017)087 | In recent work, globally well-defined Type IIB supergravity solutions with
geometry $AdS_6 \times S^2$ warped over a Riemann surface $\Sigma$ were
constructed and conjectured to describe the near-horizon geometry of $(p,q)$
five-brane webs in the conformal limit. In the present paper, we offer more
evidence for this interpretation of the supergravity solutions in terms of
five-brane webs. In particular, we explore the behavior of probe
$(p,q)$-strings in certain families of these $AdS_6 \times S^2\times \Sigma$
backgrounds and compare this behavior to that predicted by microscopic, brane
web considerations. In the microscopic picture, we argue that the embedding of
a probe string may give rise to the formation of string junctions involving
open strings anchored on the branes of the web. We then identify a quantity on
the supergravity side that is conjectured to be equivalent to the total
junction tension in a class of backgrounds corresponding to brane webs with
four semi-infinite external five-branes. In the process, we will show that for
general brane web backgrounds, the minimal energy probe string embeddings do
not coincide with the embeddings preserving half of the background
supersymmetries.Comment: 40 pages, 14 figures; v2: minor edits, references added; v3:
publication versio | (p,q)-strings probing five-brane webs | (p,q)-strings probing five-brane webs | globally supergravity warped riemann sigma conjectured horizon brane webs conformal limit. offer supergravity brane webs. explore strings families sigma backgrounds microscopic brane considerations. microscopic picture argue embedding junctions involving strings anchored branes web. quantity supergravity conjectured junction tension backgrounds brane webs infinite branes. brane backgrounds embeddings coincide embeddings preserving pages minor edits publication versio | non_dup | [] |
83870685 | 10.1007/JHEP10(2017)088 | Minimal scalar Higgs portal dark matter model is increasingly in tension with
recent results form direct detection experiments like LUX and XENON. In this
paper we make a systematic study of minimal extension of the $ \mathbb{Z}_2$
stabilised singlet scalar Higgs portal scenario in terms of their prospects at
direct detection experiments. We consider both enlarging the stabilising
symmetry to $\mathbb{Z}_3$ and incorporating multipartite features in the dark
sector. We demonstrate that in these non-minimal models the interplay of
annihilation, co-annihilation and semi-annihilation processes considerably
relax constraints from present and proposed direct detection experiments while
simultaneously saturating observed dark matter relic density. We explore in
particular the resonant semi-annihilation channel within the multipartite
$\mathbb{Z}_3$ framework which results in new unexplored regions of parameter
space that would be difficult to constrain by direct detection experiments in
the near future. The role of dark matter exchange processes within
multi-component $\mathbb{Z}_3 \times \mathbb{Z}_3'$ framework is illustrated.
We make quantitative estimates to elucidate the role of the various
annihilation processes in the different allowed regions of parameter space of
these models.Comment: 31 pages, 15 figures, added brief discussion on vaccum stability and
unitarity; minor changes in the text; updated references; typos fixed;
matches published versio | Mitigating Direct Detection Bounds in Non-minimal Higgs Portal Scalar
Dark Matter Models | mitigating direct detection bounds in non-minimal higgs portal scalar dark matter models | portal increasingly tension xenon. mathbb stabilised singlet portal prospects experiments. enlarging stabilising mathbb incorporating multipartite sector. interplay annihilation annihilation annihilation considerably relax simultaneously saturating relic density. explore resonant annihilation multipartite mathbb unexplored constrain future. mathbb mathbb illustrated. elucidate annihilation pages brief vaccum unitarity minor updated typos matches versio | non_dup | [] |
84091141 | 10.1007/JHEP10(2017)089 | We consider the operator spectrum of a three-dimensional ${\cal N} = 2$
superconformal field theory with moduli spaces of one complex dimension, such
as the fixed point theory with three chiral superfields $X,Y,Z$ and a
superpotential $W = XYZ$. By using the existence of an effective theory on each
branch of moduli space, we calculate the anomalous dimensions of certain
low-lying operators carrying large $R$-charge $J$. While the lowest primary
operator is a BPS scalar primary, the second-lowest scalar primary is in a
semi-short representation, with dimension exactly $J+1$, a fact that cannot be
seen directly from the $XYZ$ Lagrangian. The third-lowest scalar primary lies
in a long multiplet with dimension $J+2 - c_{-3} \, J^{-3} + O(J^{-4})$, where
$c_{-3}$ is an unknown positive coefficient. The coefficient $c_{-3}$ is
proportional to the leading superconformal interaction term in the effective
theory on moduli space. The positivity of $c_{-3}$ does not follow from
supersymmetry, but rather from unitarity of moduli scattering and the absence
of superluminal signal propagation in the effective dynamics of the complex
modulus. We also prove a general lemma, that scalar semi-short representations
form a module over the chiral ring in a natural way, by ordinary multiplication
of local operators. Combined with the existence of scalar semi-short states at
large $J$, this proves the existence of scalar semi-short states at all values
of $J$. Thus the combination of ${\cal N}=2$ superconformal symmetry with the
large-$J$ expansion is more powerful than the sum of its parts.Comment: 48 pages, 8 figures, LaTeX, typos correcte | Operator Dimensions from Moduli | operator dimensions from moduli | superconformal moduli chiral superfields superpotential branch moduli anomalous lying carrying lagrangian. lies multiplet unknown coefficient. superconformal moduli space. positivity supersymmetry unitarity moduli superluminal propagation modulus. representations module chiral ordinary multiplication operators. proves superconformal powerful pages latex typos correcte | non_dup | [] |
154257983 | 10.1007/JHEP10(2017)090 | Production of prompt $D^0$ mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58 \pm 0.02 nb^{−1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt s_{NN} = 5$ TeV. Measurements of the differential cross-section, the forward-backward production ratio and the nuclear modification factor are reported using $D^0$ candidates with transverse momenta less than 10 GeV/c and rapidities in the ranges $1.5 < y^ ∗ < 4.0$ and $−5.0 < y^ ∗ < −2.5$ in the nucleon-nucleon centre-of-mass system | Study of prompt $D^0$ meson production in pPb collisions at $\sqrt s_{NN} = 5$ TeV | study of prompt $d^0$ meson production in ppb collisions at $\sqrt s_{nn} = 5$ tev | prompt mesons proton proton collisions lhcb lhc. luminosity nucleon nucleon sqrt tev. backward modification candidates momenta rapidities ranges nucleon nucleon | non_dup | [] |
83847777 | 10.1007/JHEP10(2017)091 | We present a systematic calculation of the corrections of the stress-energy
tensor and currents of the free boson and Dirac fields up to second order in
thermal vorticity, which is relevant for relativistic hydrodynamics. These
corrections are non-dissipative because they survive at general thermodynamic
equilibrium with non vanishing mean values of the conserved generators of the
Lorentz group, i.e. angular momenta and boosts. Their equilibrium nature makes
it possible to express the relevant coefficients by means of correlators of the
angular-momentum and boost operators with stress-energy tensor and current,
thus making simpler to determine their so-called "Kubo formulae". We show that,
at least for free fields, the corrections are of quantum origin and we study
several limiting cases and compare our results with previous calculations. We
find that the axial current of the free Dirac field receives corrections
proportional to the vorticity independently of the anomalous term.Comment: 33 pages, final version published in JHE | General equilibrium second-order hydrodynamic coefficients for free
quantum fields | general equilibrium second-order hydrodynamic coefficients for free quantum fields | currents boson dirac vorticity relativistic hydrodynamics. dissipative survive thermodynamic vanishing conserved generators lorentz i.e. momenta boosts. express correlators boost simpler kubo formulae limiting calculations. axial dirac receives vorticity independently anomalous pages | non_dup | [] |
84331676 | 10.1007/JHEP10(2017)092 | Motivated by the black hole firewall problem, we find highly entangled pairs
of spatially localized modes in quantum field theory. We demonstrate that
appropriately chosen wavepackets localized outside the horizon are nearly
purified by 'mirror' modes behind the horizon. In addition, we calculate the
entanglement entropy of a single localized wavepacket in the Minkowski vacuum.
In all cases we study, the quantum state of the system becomes pure in the
limit that the wavepackets delocalize; we quantify the trade-off between
localization and purity.Comment: 33 pages, 4 figures. v3: typos correcte | Entangled wavepackets in the vacuum | entangled wavepackets in the vacuum | motivated firewall entangled spatially localized theory. appropriately wavepackets localized horizon nearly purified mirror behind horizon. entanglement localized wavepacket minkowski vacuum. wavepackets delocalize quantify trade localization pages figures. typos correcte | non_dup | [] |
84092949 | 10.1007/JHEP10(2017)094 | Observational evidence for dark matter stems from its gravitational
interactions, and as of yet there has been no evidence for dark matter
interacting via other means. We examine models where dark matter interactions
are purely gravitational in a Randall-Sundrum background. In particular, the
Kaluza-Klein tower of gravitons which result from the warped fifth dimension
can provide viable annihilation channels into Standard Model final states, and
we find that we can achieve values of the annihilation cross section, $\left<
\sigma v \right>$, which are consistent with the observed relic abundance in
the case of spin-1 dark matter. We examine constraints on these models
employing both the current photon line and continuum indirect dark matter
searches, and assess the prospects of hunting for the signals of such models in
future direct and indirect detection experiments.Comment: 33 pages, 8 figures; added references and fixed minor typo | Gravity-Mediated Dark Matter Annihilation in the Randall-Sundrum Model | gravity-mediated dark matter annihilation in the randall-sundrum model | observational stems gravitational interacting means. examine purely gravitational randall sundrum background. kaluza klein tower gravitons warped fifth viable annihilation annihilation sigma relic abundance matter. examine employing continuum indirect searches prospects hunting indirect pages minor typo | non_dup | [] |
83837779 | 10.1007/JHEP10(2017)095 | We study a scenario in which the baryon asymmetry of the universe arises from
a cosmological phase transition where lepton-number is spontaneously broken. If
the phase transition is first order, a lepton-number asymmetry can arise at the
bubble wall, through dynamics similar to electroweak baryogenesis, but
involving right-handed neutrinos. In addition to the usual neutrinoless double
beta decay in nuclear experiments, the model may be probed through a variety of
"baryogenesis by-products," which include a stochastic background of
gravitational waves created by the colliding bubbles. Depending on the model,
other aspects may include a network of topological defects that produce their
own gravitational waves, additional contribution to dark radiation, and a light
pseudo-Goldstone boson (majoron) as dark matter candidate.Comment: 21 pages + 10 appendices & references, 3 figure | Baryogenesis at a Lepton-Number-Breaking Phase Transition | baryogenesis at a lepton-number-breaking phase transition | baryon asymmetry universe arises cosmological lepton spontaneously broken. lepton asymmetry arise bubble electroweak baryogenesis involving handed neutrinos. usual neutrinoless beta probed baryogenesis stochastic gravitational created colliding bubbles. topological defects gravitational pseudo goldstone boson majoron pages appendices | non_dup | [] |
84090431 | 10.1007/JHEP10(2017)097 | Leptoquarks occur in many new physics scenarios and could be the next big
discovery at the LHC. The purpose of this paper is to point out that a
model-independent search strategy covering all possible leptoquarks is possible
and has not yet been fully exploited. To be systematic we organize the possible
leptoquark final states according to a leptoquark matrix with entries
corresponding to nine experimentally distinguishable leptoquark decays: any of
{light-jet, b-jet, top} with any of {neutrino, $e/\mu$, $\tau$}. The 9
possibilities can be explored in a largely model-independent fashion with
pair-production of leptoquarks at the LHC. We review the status of experimental
searches for the 9 components of the leptoquark matrix, pointing out which 3
have not been adequately covered. We plead that experimenters publish bounds on
leptoquark cross sections as functions of mass for as wide a range of
leptoquark masses as possible. Such bounds are essential for reliable recasts
to general leptoquark models. To demonstrate the utility of the leptoquark
matrix approach we collect and summarize searches with the same final states as
leptoquark pair production and use them to derive bounds on a complete set of
Minimal Leptoquark models which span all possible flavor and gauge
representations for scalar and vector leptoquarks.Comment: 19 pages + references and appendices, 18 figures, 15 tables. Added
references, fixed typo | The Leptoquark Hunter's Guide: Pair Production | the leptoquark hunter's guide: pair production | leptoquarks scenarios discovery lhc. covering leptoquarks exploited. organize leptoquark leptoquark entries nine experimentally distinguishable leptoquark decays possibilities explored largely fashion leptoquarks lhc. searches leptoquark pointing adequately covered. plead experimenters publish bounds leptoquark leptoquark possible. bounds reliable recasts leptoquark models. utility leptoquark collect summarize searches leptoquark derive bounds leptoquark span flavor representations pages appendices tables. typo | non_dup | [] |
73416025 | 10.1007/JHEP10(2017)098 | We consider a class of planar tree-level four-point functions in N=4 SYM in a
special kinematic regime: one BMN operator with two scalar excitations and
three half-BPS operators are put onto a line in configuration space;
additionally, for the half-BPS operators a co-moving frame is chosen in flavour
space. In configuration space, the four-punctured sphere is naturally
triangulated by tree-level planar diagrams. We demonstrate on a number of
examples that each tile can be associated with a modified hexagon form-factor
in such a way as to efficiently reproduce the tree-level four-point function.
Our tessellation is not of the OPE type, fostering the hope of finding an
independent, integrability-based approach to the computation of planar
four-point functions.Comment: 10 pages, 2 figure | Tessellating cushions: four-point functions in N=4 SYM | tessellating cushions: four-point functions in n=4 sym | planar kinematic excitations additionally moving flavour space. punctured sphere naturally triangulated planar diagrams. tile hexagon efficiently reproduce function. tessellation fostering hope integrability planar pages | non_dup | [] |
84090762 | 10.1007/JHEP10(2017)099 | We suggest that holographic tensor models related to SYK are viable
candidates for exactly (ie., non-perturbatively in $N$) solvable holographic
theories. The reason is that in these theories, the Hilbert space is a spinor
representation, and the Hamiltonian (at least in some classes) can be arranged
to commute with the Clifford level. This makes the theory solvable level by
level. We demonstrate this for the specific case of the uncolored $O(n)^3$
tensor model with arbitrary even $n$, and reduce the question of determining
the spectrum and eigenstates to an algebraic equation relating Young tableaux.
Solving this reduced problem is conceptually trivial and amounts to matching
the representations on either side, as we demonstrate explicitly at low levels.
At high levels, representations become bigger, but should still be tractable.
None of our arguments require any supersymmetry.Comment: 16 page | Towards a Finite-$N$ Hologram | towards a finite-$n$ hologram | holographic viable candidates perturbatively solvable holographic theories. hilbert spinor arranged commute clifford level. solvable level. uncolored determining eigenstates algebraic relating tableaux. solving conceptually trivial amounts matching representations explicitly levels. representations bigger tractable. none arguments | non_dup | [] |
84332257 | 10.1007/JHEP10(2017)102 | In this paper, we attempt to implement the neutrino $\mu$-$\tau$ reflection
symmetry (which predicts $\theta^{}_{23} = \pi/4$ and $\delta = \pm \pi/2$ as
well as trivial Majorana phases) in the minimal seesaw (which enables us to fix
the neutrino masses). For some direct (the preliminary experimental hints
towards $\theta^{}_{23} \neq \pi/4$ and $\delta \neq - \pi/2$) and indirect
(inclusion of the renormalization group equation effect and implementation of
the leptogenesis mechanism) reasons, we particularly study the breakings of
this symmetry and their phenomenological consequences.Comment: 20 pages, 7 figures, accepted for publication in JHE | Neutrino mu-tau reflection symmetry and its breaking in the minimal
seesaw | neutrino mu-tau reflection symmetry and its breaking in the minimal seesaw | attempt implement reflection predicts theta delta trivial majorana seesaw enables preliminary hints theta delta indirect inclusion renormalization leptogenesis reasons breakings phenomenological pages publication | non_dup | [] |
83864322 | 10.1007/JHEP10(2017)104 | For time-independent excited states in conformal field theories, the
entanglement entropy of small subsystems satisfies a `first law'-like relation,
in which the change in entanglement is proportional to the energy within the
entangling region. Such a law holds for time-dependent scenarios as long as the
state is perturbatively close to the vacuum, but is not expected otherwise. In
this paper we use holography to investigate the spread of entanglement entropy
for unitary evolutions of special physical interest, the so-called global
quenches. We model these using AdS-Vaidya geometries. We find that the first
law of entanglement is replaced by a linear response relation, in which the
energy density takes the role of the source and is integrated against a
time-dependent kernel with compact support. For adiabatic quenches the standard
first law is recovered, while for rapid quenches the linear response includes
an extra term that encodes the process of thermalization. This extra term has
properties that resemble a time-dependent `relative entropy'. We propose that
this quantity serves as a useful order parameter to characterize
far-from-equilibrium excited states. We illustrate our findings with concrete
examples, including generic power-law and periodically driven quenches.Comment: 31+3 pages, 8 figures; v2: typos fixed and references added; v3:
claims on universality sharpened (section 2.1), version to appear in JHE | Linear response of entanglement entropy from holography | linear response of entanglement entropy from holography | excited conformal entanglement subsystems satisfies entanglement entangling region. scenarios perturbatively otherwise. holography spread entanglement unitary evolutions quenches. vaidya geometries. entanglement replaced kernel support. adiabatic quenches recovered quenches extra encodes thermalization. extra resemble propose quantity serves characterize excited states. illustrate concrete generic periodically pages typos claims universality sharpened | non_dup | [] |
84332497 | 10.1007/JHEP10(2017)105 | The discovery of colour-kinematic duality has led to significant progress in
the computation of scattering amplitudes in quantum field theories. At tree
level, the origin of the duality can be traced back to the monodromies of
open-string amplitudes. This construction has recently been extended to all
loop orders. In the present paper, we dissect some consequences of these new
monodromy relations at one loop. We use single cuts in order to relate them to
the tree-level relations. We show that there are new classes of kinematically
independent single-cut amplitudes. Then we turn to the Feynman diagrammatics of
the string-theory monodromy relations. We revisit the string-theoretic
derivation and argue that some terms, that vanish upon integration in string
and field theory, provide a characterisation of momentum-shifting ambiguities
in these representations. We observe that colour-dual representations are
compatible with this analysis.Comment: 24 pages + appendices + refs; v3 minor corrections, journal versio | One-loop monodromy relations on single cuts | one-loop monodromy relations on single cuts | discovery colour kinematic duality progress amplitudes theories. duality traced monodromies amplitudes. orders. dissect consequences monodromy loop. cuts relate relations. kinematically amplitudes. feynman diagrammatics monodromy relations. revisit theoretic derivation argue vanish characterisation shifting ambiguities representations. colour representations compatible pages appendices refs minor versio | non_dup | [] |
84331835 | 10.1007/JHEP10(2017)106 | We continue the study of Lagrangian descriptions of $\mathcal{N}=2$
Argyres-Douglas theories. We use our recent interpretation in terms of
sequential confinement to guess the Lagrangians of all the Argyres-Douglas
models with Abelian three dimensional mirror. We find classes of four
dimensional $\mathcal{N}=1$ quivers that flow in the infrared to generalized
Argyres-Douglas theories, such as the $(A_k,A_{kN+N-1})$ models. We study in
detail how the $\mathcal{N}=1$ chiral rings map to the Coulomb and Higgs
Branches of the $\mathcal{N}=2$ CFT's. The three dimensional mirror RG flows
are shown to land on the $\mathcal{N}=4$ complete graph quivers. We also
compactify to three dimensions the gauge theory dual to $(A_1,D_4)$, and find
the expected Abelianization duality with $\mathcal{N}=4$ SQED with $3$ flavors.Comment: 49 pages. v2: refs adde | Lagrangians for generalized Argyres-Douglas theories | lagrangians for generalized argyres-douglas theories | continue lagrangian descriptions mathcal argyres douglas theories. sequential confinement guess lagrangians argyres douglas abelian mirror. mathcal quivers infrared argyres douglas models. mathcal chiral rings coulomb branches mathcal mirror flows mathcal quivers. compactify abelianization duality mathcal sqed pages. refs adde | non_dup | [] |
86415400 | 10.1007/JHEP10(2017)107 | Motivated by recent studies of holographic complexity, we examine the
question of circuit complexity in quantum field theory. We provide a quantum
circuit model for the preparation of Gaussian states, in particular the ground
state, in a free scalar field theory for general dimensions. Applying the
geometric approach of Nielsen to this quantum circuit model, the complexity of
the state becomes the length of the shortest geodesic in the space of circuits.
We compare the complexity of the ground state of the free scalar field to the
analogous results from holographic complexity, and find some surprising
similarities.Comment: Corrected typo in eqs. (1.1) and (3.35). Added footnote on pg. 33,
and additional references. Author name chang | Circuit complexity in quantum field theory | circuit complexity in quantum field theory | motivated holographic examine circuit theory. circuit preparation dimensions. geometric nielsen circuit shortest geodesic circuits. analogous holographic surprising corrected typo eqs. footnote references. name chang | non_dup | [] |
86414948 | 10.1007/JHEP10(2017)108 | The geometerization of the renormalization group flow triggered by the
$T\bar{T}$ deformation of large $c$ conformal field theories in two dimensions
is presented. This entails the construction of the off shell Einstein-Hilbert
action in three dimensions from said renormalization group flow.
The crucial ingredient to this construction will be the encoding of general
covariance in the emergent bulk theory in a very particular form of the
Wess--Zumino consistency conditions. The utilisation of the local
renormalization group, which requires putting the theory under consideration on
an arbitrary background geometry, supplemented by the aforementioned covariance
condition ensures that the whole construction is background independent.Comment: 13 pages, no figure | Background independent holographic dual to $T\bar{T}$ deformed CFT with
large central charge in 2 dimensions | background independent holographic dual to $t\bar{t}$ deformed cft with large central charge in 2 dimensions | geometerization renormalization triggered deformation conformal presented. entails einstein hilbert said renormalization flow. crucial ingredient encoding covariance emergent wess zumino consistency conditions. utilisation renormalization putting consideration supplemented aforementioned covariance ensures pages | non_dup | [] |
86415901 | 10.1007/JHEP10(2017)109 | We propose a minimal supersymmetric Twin Higgs model that can accommodate
tuning of the electroweak scale for heavy stops better than 10% with high
mediation scales of supersymmetry breaking. A crucial ingredient of this model
is a new SU(2)_X gauge symmetry which provides a D-term potential that
generates a large SU(4) invariant coupling for the Higgs sector and only small
set of particles charged under SU(2)_X, which allows the model to be
perturbative around the Planck scale. The new gauge interaction drives the top
yukawa coupling small at higher energy scales, which also reduces the tuning.Comment: 24 pages, 7 figures, matched to the published versio | Minimal Non-Abelian Supersymmetric Twin Higgs | minimal non-abelian supersymmetric twin higgs | propose supersymmetric twin accommodate tuning electroweak stops mediation supersymmetry breaking. crucial ingredient generates perturbative planck scale. drives yukawa reduces pages matched versio | non_dup | [] |
86415642 | 10.1007/JHEP10(2017)110 | In large-$N_c$ conformal field theories with classical holographic duals,
inverse coupling constant corrections are obtained by considering
higher-derivative terms in the corresponding gravity theory. In this work, we
use type IIB supergravity and bottom-up Gauss-Bonnet gravity to study the
dynamics of boost-invariant Bjorken hydrodynamics at finite coupling. We
analyze the time-dependent decay properties of non-local observables (scalar
two-point functions and Wilson loops) probing the different models of Bjorken
flow and show that they can be expressed generically in terms of a few field
theory parameters. In addition, our computations provide an analytically
quantifiable probe of the coupling-dependent validity of hydrodynamics at early
times in a simple model of heavy-ion collisions, which is an observable closely
analogous to the hydrodynamization time of a quark-gluon plasma. We find that
to third order in the hydrodynamic expansion, the convergence of hydrodynamics
is improved and that generically, as expected from field theory considerations
and recent holographic results, the applicability of hydrodynamics is delayed
as the field theory coupling decreases.Comment: 37+5 pages, multiple figures. v2: typos corrected, matches published
versio | Holographic constraints on Bjorken hydrodynamics at finite coupling | holographic constraints on bjorken hydrodynamics at finite coupling | conformal holographic duals theory. supergravity gauss bonnet boost bjorken hydrodynamics coupling. analyze observables wilson loops probing bjorken generically parameters. computations analytically quantifiable validity hydrodynamics collisions observable closely analogous hydrodynamization gluon plasma. hydrodynamic hydrodynamics generically considerations holographic applicability hydrodynamics delayed pages figures. typos corrected matches versio | non_dup | [] |
42720903 | 10.1007/JHEP10(2017)111 | The form of higher-spin current interactions in $AdS_4$ is derived from the
full nonlinear higher-spin equations in the sector of Weyl 0-forms. The
coupling constant in front of spin-one currents built from scalars and spinors
as well as Yukawa coupling are determined explicitly. Couplings of all other
higher-spin current interactions are determined implicitly. All couplings are
shown to be independent of the phase parameter of the nonlinear higher-spin
theory. The proper holographic dependence of the vertex on the higher-spin
phase parameter is shown to result from the boundary conditions on the bulk
fields.Comment: 29 pages; V2: Discussion of locality is reduced in favor of a focused
forthcoming paper. The title is modified correspondingly. Coefficients and
typos corrected. 26 pages; V3: Section 5.2 explaining the idea of derivation
of the main result and references are added. The Journal version. 28 page | Current Interactions and Holography from the 0-Form Sector of Nonlinear
Higher-Spin Equations | current interactions and holography from the 0-form sector of nonlinear higher-spin equations | weyl forms. front currents built scalars spinors yukawa explicitly. couplings implicitly. couplings theory. proper holographic pages locality favor focused forthcoming paper. title correspondingly. typos corrected. pages explaining derivation added. version. | non_dup | [] |
83839019 | 10.1007/JHEP10(2017)114 | We point out that unitary representations of the Virasoro algebra contain
Berry phases obtained by acting on a primary state with conformal
transformations that trace a closed path on a Virasoro coadjoint orbit. These
phases can be computed exactly thanks to the Maurer-Cartan form on the Virasoro
group, and they persist after combining left- and right-moving sectors.
Thinking of Virasoro representations as particles in AdS_3 dressed with
boundary gravitons, the Berry phases associated with Brown-Henneaux
diffeomorphisms provide a gravitational extension of Thomas precession.Comment: 34 pages, 3 figures. v2: examples moved to appendix + minor
clarifications. Published in JHE | Berry Phases on Virasoro Orbits | berry phases on virasoro orbits | unitary representations virasoro berry acting conformal transformations trace virasoro coadjoint orbit. thanks maurer cartan virasoro persist combining moving sectors. thinking virasoro representations dressed gravitons berry brown henneaux diffeomorphisms gravitational thomas pages figures. moved minor clarifications. | non_dup | [] |
84328898 | 10.1007/JHEP10(2017)115 | We derive the three-body quantization condition in a finite volume using an
effective field theory in the particle-dimer picture. Moreover, we consider the
extraction of physical observables from the lattice spectrum using the
quantization condition. To illustrate the general framework, we calculate the
volume-dependent three-particle spectrum in a simple model both below and above
the three-particle threshold. The relation to existing approaches is discussed
in detail.Comment: 36 pages, 9 figure | Three particle quantization condition in a finite volume: 2. general
formalism and the analysis of data | three particle quantization condition in a finite volume: 2. general formalism and the analysis of data | derive quantization dimer picture. extraction observables quantization condition. illustrate threshold. pages | non_dup | [] |
84090540 | 10.1007/JHEP10(2017)116 | We provide a proposal, motivated by Separation of Variables and gauge theory
arguments, for constructing exact solutions to the quantum Baxter equation
associated to the $N$-particle relativistic Toda chain and test our proposal
against numerical results. Quantum Mechanical non-perturbative corrections,
essential in order to obtain a sensible solution, are taken into account in our
gauge theory approach by considering codimension two defects on curved
backgrounds (squashed $S^5$ and degenerate limits) rather than flat space; this
setting also naturally incorporates exact quantization conditions and energy
spectrum of the relativistic Toda chain as well as its modular dual structure.Comment: 85 pages, 6 tables, 21 figure | Exact relativistic Toda chain eigenfunctions from Separation of
Variables and gauge theory | exact relativistic toda chain eigenfunctions from separation of variables and gauge theory | proposal motivated arguments constructing baxter relativistic toda proposal results. perturbative sensible codimension defects curved backgrounds squashed degenerate naturally incorporates quantization relativistic toda modular pages tables | non_dup | [] |
78510497 | 10.1007/JHEP10(2017)119 | Applications of the bootstrap program to superconformal field theories
promise unique new insights into their landscape and could even lead to the
discovery of new models. Most existing results of the superconformal bootstrap
were obtained form correlation functions of very special fields in short (BPS)
representations of the superconformal algebra. Our main goal is to initiate a
superconformal bootstrap for long multiplets, one that exploits all constraints
from superprimaries and their descendants. To this end, we work out the Casimir
equations for four-point correlators of long multiplets of the two-dimensional
global $\mathcal{N}=2$ superconformal algebra. After constructing the full set
of conformal blocks we discuss two different applications. The first one
concerns two-dimensional (2,0) theories. The numerical bootstrap analysis we
perform serves a twofold purpose, as a feasibility study of our long multiplet
bootstrap and also as an exploration of (2,0) theories. A second line of
applications is directed towards four-dimensional $\mathcal{N}=3$ SCFTs. In
this context, our results imply a new bound $c \geqslant \tfrac{13}{24}$ for
the central charge of such models, which we argue cannot be saturated by an
interacting SCFT.Comment: 39 pages (32 plus one appendix), 4 figures; v2: added discussion on
the non-saturation of the analytic central charge bound; v3: footnote added,
small typos correcte | Long Multiplet Bootstrap | long multiplet bootstrap | bootstrap superconformal promise insights landscape discovery models. superconformal bootstrap representations superconformal algebra. goal initiate superconformal bootstrap multiplets exploits superprimaries descendants. casimir correlators multiplets mathcal superconformal algebra. constructing conformal blocks applications. concerns theories. bootstrap serves twofold feasibility multiplet bootstrap exploration theories. directed mathcal scfts. imply geqslant tfrac argue saturated interacting pages saturation analytic footnote typos correcte | non_dup | [] |
93939729 | 10.1007/JHEP10(2017)120 | Composite Higgs models with anarchic partial compositeness require a scale of
new physics ${\cal O}(10-100)$ TeV, with the bounds being dominated by the
dipole moments and $\epsilon_K$. The presence of anarchic bilinear interactions
can change this picture. We show a solution to the SM flavor puzzle where the
electron and the Right-handed quarks of the first generation have negligible
linear interactions, and the bilinear interactions account for most of their
masses, whereas the other chiral fermions follow a similar pattern to anarchic
partial compositeness. We compute the bounds from flavor and CP violation and
show that neutron and electron dipole moments, as well as $\epsilon_K$ and
$\mu\to e\gamma$, are compatible with a new physics scale below the TeV.
$\Delta F=2$ operators involving Left-handed quarks and $\Delta F=1$ operators
with $d_L$ give the most stringent bounds in this scenario. Their Wilson
coefficients have the same origin as in anarchic partial compositeness,
requiring the masses of the new states to be larger than ${\cal O}(6-7)$ TeV.Comment: 26 page | Anarchy with linear and bilinear interactions | anarchy with linear and bilinear interactions | composite anarchic compositeness bounds dominated dipole moments epsilon anarchic bilinear picture. flavor puzzle handed quarks negligible bilinear chiral fermions anarchic compositeness. bounds flavor violation neutron dipole moments epsilon gamma compatible tev. delta involving handed quarks delta stringent bounds scenario. wilson anarchic compositeness requiring | non_dup | [] |
86416596 | 10.1007/JHEP10(2017)123 | We study the black string solutions in the Einstein-Gauss-Bonnet(EGB) theory
at large $D$. By using the $1/D$ expansion in the near horizon region we derive
the effective equations that describe the dynamics of the EGB black strings.
The uniform and non-uniform black strings are obtained as the static solutions
of the effective equations. From the perturbation analysis of the effective
equations, we find that thin EGB black strings suffer from the Gregory-Laflamme
instablity and the GB term weakens the instability when the GB coefficient is
small, however, when the GB coefficient is large the GB term enhances the
instability. Furthermore, we numerically solve the effective equations to study
the non-linear instability. It turns out that the thin black strings are
unstable to developing inhomogeneities along their length, and at late times
they asymptote to the stable non-uniform black strings. The behavior is
qualitatively similar to the case in the Einstein gravity. Compared with the
black string instability in the Einstein gravity at large D, when the GB
coefficient is small the time needed to reach to final state increases, but
when the GB coefficient is large the time to reach to final state decreases.
Starting from the point of view in which the effective equations can be
interpreted as the equations for the dynamical fluid, we evaluate the transport
coefficients and find that the ratio of the shear viscosity and the entropy
density agrees with that obtained previously in the membrane paradigm after
taking the large $D$ limit.Comment: 22 pages, 8 figures, some errors corrected, references adde | Einstein-Gauss-Bonnet Black Strings at Large $D$ | einstein-gauss-bonnet black strings at large $d$ | einstein gauss bonnet horizon derive strings. strings equations. perturbation strings suffer gregory laflamme instablity weakens instability enhances instability. numerically solve instability. turns strings unstable inhomogeneities asymptote strings. qualitatively einstein gravity. instability einstein decreases. interpreted viscosity agrees paradigm pages corrected adde | non_dup | [] |
86417078 | 10.1007/JHEP10(2017)124 | The process ${\rm p}{\rm p}\to\mu^+\nu_\mu{\rm e}^+\nu_{\rm e}{\rm j}{\rm j}$
receives several contributions of different orders in the strong and
electroweak coupling constants. Using appropriate event selections, this
process is dominated by vector-boson scattering (VBS) and has recently been
measured at the LHC. It is thus of prime importance to estimate precisely each
contribution. In this article we compute for the first time the full NLO QCD
and electroweak corrections to VBS and its irreducible background processes
with realistic experimental cuts. We do not rely on approximations but use
complete amplitudes involving two different orders at tree level and three
different orders at one-loop level. Since we take into account all
interferences, at NLO level the corrections to the VBS process and to the
QCD-induced irreducible background process contribute at the same orders. Hence
the two processes cannot be unambiguously distinguished, and all contributions
to the $\mu^+\nu_\mu{\rm e}^+\nu_{\rm e}{\rm j}{\rm j}$ final state should be
preferably measured together.Comment: 25 pages,21 eps-figures. Matches the published versio | Complete NLO corrections to ${\rm W}^+{\rm W}^+$ scattering and its
irreducible background at the LHC | complete nlo corrections to ${\rm w}^+{\rm w}^+$ scattering and its irreducible background at the lhc | receives orders electroweak constants. selections dominated boson lhc. prime precisely contribution. electroweak irreducible realistic cuts. rely approximations amplitudes involving orders orders level. interferences irreducible orders. unambiguously distinguished preferably pages figures. matches versio | non_dup | [] |
93945958 | 10.1007/JHEP10(2017)125 | An extensive study of the compact $U(1)$ lattice gauge theory with a higher
derivative gauge-fixing term and a suitable counter-term has been undertaken to
determine the nature of the possible continuum limits for a wide range of the
parameters, especially at strong gauge couplings ($g>1$), adding to our
previous study at a single gauge coupling $g=1.3$ \cite{DeSarkar2016}. Our
major conclusion is that a continuum limit of free massless photons (with the
redundant pure gauge degrees of freedom decoupled) is achieved at any gauge
coupling, not necessarily small, provided the coefficient $\tilde{\kappa}$ of
the gauge-fixing term is sufficiently large. In fact, the region of continuous
phase transition leading to the above physics in the strong gauge coupling
region is found to be analytically connected to the point $g=0$ and
$\tilde{\kappa} \rightarrow \infty$ where the classical action has a global
unique minimum, around which weak coupling perturbation theory in bare
parameters is defined, controlling the physics of the whole region. A second
major conclusion is that, local algorithms like Multihit Metropolis fail to
produce faithful field configurations with large values of the coefficient
$\tilde{\kappa}$ of the higher derivative gauge-fixing term and at large
lattice volumes. A global algorithm like Hybrid Monte Carlo, although at times
slow to move out of metastabilities, generally is able to produce faithful
configurations and has been used extensively in the current study.Comment: 25 pages, 18 figures, version accepted for publication in JHE | Non-perturbatively gauge-fixed compact $U(1)$ lattice gauge theory | non-perturbatively gauge-fixed compact $u(1)$ lattice gauge theory | extensive fixing counter undertaken continuum couplings adding cite desarkar continuum massless photons redundant freedom decoupled necessarily tilde kappa fixing sufficiently large. analytically tilde kappa rightarrow infty perturbation bare controlling region. multihit metropolis fail faithful configurations tilde kappa fixing volumes. hybrid monte carlo slow move metastabilities faithful configurations extensively pages publication | non_dup | [] |
83865424 | 10.1007/JHEP10(2017)126 | We present an interacting system of equations with sixteen supersymmetries
and an $SO(2)\times SO(6)$ R-symmetry where the fields depend on two space and
one null dimensions that is derived from a representation of the
six-dimensional (2,0) superalgebra. The system can be viewed as two M5-branes
compactified on $S^1_-\times {\mathbb T}^2$ or equivalently as M2-branes on
${\mathbb R}_+\times {\mathbb R}^2$, where $\pm$ refer to null directions. We
show that for a particular choice of fields the dynamics can be reduced to
motion on the moduli space of solutions to the Hitchin system. We argue that
this provides a description of intersecting null M2-branes and is also related
by U-duality to a DLCQ description of four-dimensional maximally supersymmetric
Yang-Mills.Comment: Errors in the supersymmetry transformations correcte | The (2,0) Superalgebra, Null M-branes and Hitchin's System | the (2,0) superalgebra, null m-branes and hitchin's system | interacting sixteen supersymmetries superalgebra. viewed branes compactified mathbb equivalently branes mathbb mathbb directions. moduli hitchin system. argue intersecting branes duality dlcq maximally supersymmetric supersymmetry transformations correcte | non_dup | [] |
73366751 | 10.1007/JHEP10(2017)128 | As was shown in 1984 by Caneschi, Farrar, and Schwimmer, decomposing
representations of the supergroup SU(M|N), can give interesting anomaly-free
sets of fermion representations of SU(M) x SU(N) x U(1). It is shown here that
such groups can be used to construct realistic grand unified models with
non-abelian gauged family symmetries. A particularly simple three-family
example based on SU(5) x SU(2) x U(1) is studied. The forms of the mass
matrices, including that of the right-handed neutrinos, are determined in terms
of SU(2) Clebsch coefficients; and the model is able to fit the lepton sector
and predict the Dirac CP-violating phase of the neutrinos.. Models of this type
would have a rich phenomenology if part of the family symmetry is broken near
the electroweak scale.Comment: 11 pages, no figures. Title changed. Section 3 expanded to include
realistic solution for lepton secto | Families from Supergroups and Predictions for Leptonic CP Violation | families from supergroups and predictions for leptonic cp violation | caneschi farrar schwimmer decomposing representations supergroup anomaly fermion representations realistic grand unified abelian gauged symmetries. studied. handed neutrinos clebsch lepton predict dirac violating neutrinos.. phenomenology broken electroweak pages figures. title changed. expanded realistic lepton secto | non_dup | [] |
83860711 | 10.1007/JHEP10(2017)130 | We construct an infinite-dimensional space of solutions to Vasiliev's
equations in four dimensions that are asymptotic to AdS spacetime and superpose
massless scalar particle modes over static higher spin black holes. Each
solution is obtained by a large gauge transformation of an all-order
perturbatively defined particular solution given in a simple gauge, in which
the spacetime connection vanishes, the twistor space connection is holomorphic,
and all local degrees of freedom are encoded into the residual twistor space
dependence of the spacetime zero-forms. The latter are expanded over two dual
spaces of Fock space operators, corresponding to scalar particle and static
black hole modes, equipped with positive definite sesquilinear and bilinear
forms, respectively. Switching on an AdS vacuum gauge function, the twistor
space connection becomes analytic at generic spacetime points, which makes it
possible to reach Vasiliev's gauge, in which Fronsdal fields arise
asymptotically, by another large transformation given here at first order. The
particle and black hole modes are related by a twistor space Fourier transform,
resulting in a black hole backreaction already at the second order of classical
perturbation theory. We speculate on the existence of a fine-tuned branch of
moduli space that is free from black hole modes and directly related to the
quasi-local deformed Fronsdal theory. Finally, we comment on a possible
interpretation of the higher spin black hole solutions as black-hole
microstates.Comment: 63 pages + appendices; v2: reference added; v3: comments and
references added, typos correcte | 4D Higher Spin Black Holes with Nonlinear Scalar Fluctuations | 4d higher spin black holes with nonlinear scalar fluctuations | infinite vasiliev asymptotic spacetime superpose massless holes. perturbatively spacetime connection vanishes twistor connection holomorphic freedom encoded residual twistor spacetime forms. expanded fock equipped definite sesquilinear bilinear respectively. switching twistor connection analytic generic spacetime vasiliev fronsdal arise asymptotically order. twistor fourier transform backreaction perturbation theory. speculate fine tuned branch moduli quasi deformed fronsdal theory. comment pages appendices comments typos correcte | non_dup | [] |
84328227 | 10.1007/JHEP10(2017)133 | We examine magnetotransport in a holographic Dirac-Born-Infeld model, taking
into account the effects of backreaction on the geometry. The theory we
consider includes axionic scalars, introduced to break translational symmetry
and generate momentum dissipation. The generic structure of the DC conductivity
matrix for these theories is extremely rich, and is significantly more complex
than that obtained in the probe approximation. We find new classes of black
brane solutions, including geometries that exhibit Lifshitz scaling and
hyperscaling violation, and examine their implications on the transport
properties of the system. Depending on the choice of theory parameters, these
backgrounds can lead to metallic or insulating behavior. Negative
magnetoresistance is observed in a family of dynoic solutions. Some of the new
backreacted geometries also support magnetic-field-induced metal-insulator
transitions.Comment: 34 pages, 9 figures; v2: references added, minor improvements, to
appear in JHE | Backreacted DBI Magnetotransport with Momentum Dissipation | backreacted dbi magnetotransport with momentum dissipation | examine magnetotransport holographic dirac born infeld backreaction geometry. axionic scalars break translational dissipation. generic conductivity extremely approximation. brane geometries exhibit lifshitz hyperscaling violation examine system. backgrounds metallic insulating behavior. magnetoresistance dynoic solutions. backreacted geometries insulator pages minor improvements | non_dup | [] |
83853535 | 10.1007/JHEP10(2017)134 | We extend the $P$-flux analysis carried out recently on the
$T^6/[\mathbb{Z}_2 \times \mathbb{Z}_2 ]$ type-II orientifold model to include
all the possible non-geometric fluxes. By deriving universal T-duality rules
for all the fluxes, we are able to write down a complete expression for the
superpotential for both the IIB and IIA theories. By exploiting the universal
T-duality rules that apply to all the branes in string theory, we then identify
all the exotic branes that can be consistently included to cancel the tadpoles
induced by the fluxes. Finally, we derive the representations of these branes
with respect to the $SL(2,\mathbb{Z})^7$ duality symmetry of the model.Comment: 33 pages, refs. added. Notation improved. Discussion on the solutions
of the tadpole conditions added in the conclusions. Version published on JHE | Non-geometric fluxes & tadpole conditions for exotic branes | non-geometric fluxes & tadpole conditions for exotic branes | extend mathbb mathbb orientifold geometric fluxes. deriving universal duality fluxes superpotential theories. exploiting universal duality branes exotic branes consistently cancel tadpoles fluxes. derive representations branes mathbb duality pages refs. added. notation improved. tadpole conclusions. | non_dup | [] |
83853673 | 10.1007/JHEP10(2017)135 | We show a symmetry that, in the context of a composite Higgs with anarchic
flavor, can suppress the dominant CP violating contributions to $K-\bar K$
mixing. Based on previous extensions of SU(3)$_c$, we consider the case in
which the composite sector has a global SU(6) symmetry, spontaneously broken to
a subgroup containing SU(3)$\times$SU(3). We show that the interactions with
the Standard Model can spontaneously break the remaining symmetry to the
diagonal subgroup, identified with the group of color interactions, and
naturally suppress $\epsilon_K$. We consider this scenario in the context of
the Minimal Composite Higgs Model based on SO(5)/SO(4) for the electroweak
sector. By working in the framework of 2-site models, we compute the scalar
potential, determine the conditions for a successful breaking of the symmetries
and calculate the spectrum of lightest states. We find that $\epsilon_K$ can be
suppressed and the top mass reproduced for a large region of the parameter
space where the symmetries are dynamically broken. Besides other new
resonances, the model predicts the presence of a new singlet scalar state,
generally lighter than the Higgs, that could have evaded detection at
colliders.Comment: 33 pages, 4 figures, v2: discussion on bounds from dipole moments
added, references adde | A symmetry for $\epsilon_K$ | a symmetry for $\epsilon_k$ | composite anarchic flavor suppress violating mixing. extensions composite spontaneously broken subgroup spontaneously break diagonal subgroup naturally suppress epsilon composite electroweak sector. successful breaking symmetries lightest states. epsilon suppressed reproduced symmetries dynamically broken. besides resonances predicts singlet lighter evaded pages bounds dipole moments adde | non_dup | [] |
83859853 | 10.1007/JHEP10(2017)136 | We derive an asymptotic formula for operator product expansion coefficients
of heavy operators in two dimensional conformal field theory. This follows from
modular invariance of the genus two partition function, and generalises the
asymptotic formula for the density of states from torus modular invariance. The
resulting formula is universal, depending only on the central charge, but
involves the asymptotic behaviour of genus two conformal blocks. We use
monodromy techniques to compute the asymptotics of the relevant blocks at large
central charge to determine the behaviour explicitly.Comment: 32 pages, 2 figures, 1 appendix, 2 moose, a bear and an o | A new handle on three-point coefficients: OPE asymptotics from genus two
modular invariance | a new handle on three-point coefficients: ope asymptotics from genus two modular invariance | derive asymptotic conformal theory. modular invariance genus partition generalises asymptotic torus modular invariance. universal involves asymptotic genus conformal blocks. monodromy asymptotics blocks pages moose bear | non_dup | [] |
93940590 | 10.1007/JHEP10(2017)137 | We use holographic duality to study the entanglement entropy (EE) of
Conformal Field Theories (CFTs) in various spacetime dimensions $d$, in the
presence of various deformations: a relevant Lorentz scalar operator with
constant source, a temperature $T$, a chemical potential $\mu$, a marginal
Lorentz scalar operator with source linear in a spatial coordinate, and a
circle-compactified spatial direction. We consider EE between a strip or sphere
sub-region and the rest of the system, and define the "entanglement density"
(ED) as the change in EE due to the deformation, divided by the sub-region's
volume. Using the deformed CFTs above, we show how the ED's dependence on the
strip width or sphere radius, $L$, is useful for characterizing states of
matter. For example, the ED's small-$L$ behavior is determined either by the
dimension of the perturbing operator or by the first law of EE. For
Lorentz-invariant renormalization group (RG) flows between CFTs, the "area
theorem" states that the coefficient of the EE's area law term must be larger
in the UV than in the IR. In these cases the ED must therefore approach zero
from below as $L \to \infty$. However, when Lorentz symmetry is broken and the
IR fixed point has different scaling from the UV, we find that the ED often
approaches the thermal entropy density from above, indicating area theorem
violation.Comment: References clarified and updated compared to JHEP versio | On Holographic Entanglement Density | on holographic entanglement density | holographic duality entanglement conformal cfts spacetime deformations lorentz marginal lorentz coordinate circle compactified direction. strip sphere entanglement deformation divided volume. deformed cfts strip sphere characterizing matter. perturbing lorentz renormalization flows cfts infty lorentz broken clarified updated jhep versio | non_dup | [] |
83842312 | 10.1007/JHEP10(2017)138 | The out-of-time-order correlator (OTOC) is considered as a measure of quantum
chaos. We formulate how to calculate the OTOC for quantum mechanics with a
general Hamiltonian. We demonstrate explicit calculations of OTOCs for a
harmonic oscillator, a particle in a one-dimensional box, a circle billiard and
stadium billiards. For the first two cases, OTOCs are periodic in time because
of their commensurable energy spectra. For the circle and stadium billiards,
they are not recursive but saturate to constant values which are linear in
temperature. Although the stadium billiard is a typical example of the
classical chaos, an expected exponential growth of the OTOC is not found. We
also discuss the classical limit of the OTOC. Analysis of a time evolution of a
wavepacket in a box shows that the OTOC can deviate from its classical value at
a time much earlier than the Ehrenfest time.Comment: 30 pages, 13 figure | Out-of-time-order correlators in quantum mechanics | out-of-time-order correlators in quantum mechanics | correlator otoc chaos. formulate otoc mechanics hamiltonian. otocs harmonic oscillator circle billiard stadium billiards. otocs commensurable spectra. circle stadium billiards recursive saturate temperature. stadium billiard chaos exponential otoc found. otoc. wavepacket otoc deviate ehrenfest pages | non_dup | [] |
86413819 | 10.1007/JHEP10(2017)139 | We construct the gravity dual of $d=4$, $\mathcal{N}=4$, SU($N_\rm{c}$) super
Yang-Mills theory, coupled to $N_\rm{f}$ flavors of dynamical quarks, at
non-zero temperature $T$ and non-zero quark density $N_\rm{q}$. The
supergravity solutions possess a regular horizon if $T>0$ and include the
backreaction of $N_\rm{c}$ color D3-branes and $N_\rm{f}$ flavor D7-branes with
$N_\rm{q}$ units of electric flux on their worldvolume. At zero temperature the
solutions interpolate between a Landau pole singularity in the ultraviolet and
a Lifshitz geometry in the infrared. At high temperature the thermodynamics is
directly sensitive to the Landau pole, whereas at low temperature it is not, as
expected from effective field theory. At low temperature and sufficiently high
charge density we find thermodynamic and dynamic instabilities towards the
spontaneous breaking of translation invariance.Comment: 38 pages plus appendices, 25 figures. v2: minor changes, published
versio | Towards a Holographic Quark Matter Crystal | towards a holographic quark matter crystal | mathcal super mills flavors quarks supergravity possess horizon backreaction branes flavor branes worldvolume. interpolate landau pole singularity ultraviolet lifshitz infrared. thermodynamics landau pole theory. sufficiently thermodynamic instabilities spontaneous breaking translation pages appendices figures. minor versio | non_dup | [] |
86416141 | 10.1007/JHEP10(2017)140 | We study CFT2 conformal blocks on a torus and their holographic realization.
The classical conformal blocks arising in the regime where conformal dimensions
grow linearly with the large central charge are shown to be holographically
dual to the geodesic networks stretched in the thermal AdS bulk space. We
discuss the n-point conformal blocks and their duals, the 2-point case is
elaborated in full detail. We develop various techniques to calculate both
quantum and classical conformal block functions. In particular, we show that
exponentiated global torus blocks reproduce classical torus blocks in the
specific perturbative regimes of the conformal parameter space.Comment: 37 pages, v2: more comments, Appendix E --> Section 7.1, refs added,
journal versio | Holographic duals of large-c torus conformal blocks | holographic duals of large-c torus conformal blocks | conformal blocks torus holographic realization. conformal blocks arising conformal grow linearly holographically geodesic stretched space. conformal blocks duals elaborated detail. conformal functions. exponentiated torus blocks reproduce torus blocks perturbative regimes conformal pages comments refs versio | non_dup | [] |
84331279 | 10.1007/JHEP10(2017)142 | R-symmetry leads to a distinct realisation of SUSY with a significantly
modified coloured sector featuring a Dirac gluino and a scalar colour octet
(sgluon). We present the impact of R-symmetry on squark production at the 13
TeV LHC. We study the total cross sections and their NLO corrections from all
strongly interacting states, their dependence on the Dirac gluino mass and
sgluon mass as well as their systematics for selected benchmark points. We find
that tree-level cross sections in the R-symmetric model are reduced compared to
the MSSM but the NLO K-factors are generally larger in the order of ten to
twenty per cent. In the course of this work we derive the required DREG $\to$
DRED transition counterterms and necessary on-shell renormalisation constants.
The real corrections are treated using FKS subtraction, with results cross
checked against an independent calculation employing the two cut phase space
slicing method.Comment: 46 pages, 15 figures; updated to match published versio | Squark production in R-symmetric SUSY with Dirac gluinos: NLO
corrections | squark production in r-symmetric susy with dirac gluinos: nlo corrections | realisation susy coloured featuring dirac gluino colour octet sgluon squark lhc. interacting dirac gluino sgluon systematics benchmark points. mssm twenty cent. derive dreg dred counterterms renormalisation constants. subtraction checked employing slicing pages updated match versio | non_dup | [] |
86417943 | 10.1007/JHEP10(2017)143 | We analyzed the evolution data of the Daya Bay reactor neutrino experiment in
terms of short-baseline active-sterile neutrino oscillations taking into
account the theoretical uncertainties of the reactor antineutrino fluxes. We
found that oscillations are disfavored at $2.6\sigma$ with respect to a
suppression of the $^{235}\text{U}$ reactor antineutrino flux and at
$2.5\sigma$ with respect to variations of the $^{235}\text{U}$ and
$^{239}\text{Pu}$ fluxes. On the other hand, the analysis of the rates of the
short-baseline reactor neutrino experiments favor active-sterile neutrino
oscillations and disfavor the suppression of the $^{235}\text{U}$ flux at
$3.1\sigma$ and variations of the $^{235}\text{U}$ and $^{239}\text{Pu}$ fluxes
at $2.8\sigma$. We also found that both the Daya Bay evolution data and the
global rate data are well-fitted with composite hypotheses including variations
of the $^{235}\text{U}$ or $^{239}\text{Pu}$ fluxes in addition to
active-sterile neutrino oscillations. A combined analysis of the Daya Bay
evolution data and the global rate data shows a slight preference for
oscillations with respect to variations of the $^{235}\text{U}$ and
$^{239}\text{Pu}$ fluxes. However, the best fits of the combined data are given
by the composite models, with a preference for the model with an enhancement of
the $^{239}\text{Pu}$ flux and relatively large oscillations.Comment: 9 page | Reactor Fuel Fraction Information on the Antineutrino Anomaly | reactor fuel fraction information on the antineutrino anomaly | daya reactor sterile oscillations reactor antineutrino fluxes. oscillations disfavored sigma suppression reactor antineutrino sigma fluxes. reactor favor sterile oscillations disfavor suppression sigma fluxes sigma daya fitted composite hypotheses fluxes sterile oscillations. daya slight preference oscillations fluxes. fits composite preference enhancement | non_dup | [] |
83863637 | 10.1007/JHEP10(2017)144 | We introduce a magnetic analogue of the seven-dimensional nonassociative
octonionic R-flux algebra that describes the phase space of M2-branes in
four-dimensional locally non-geometric M-theory backgrounds. We show that these
two algebras are related by a Spin(7) automorphism of the 3-algebra that
provides a covariant description of the eight-dimensional M-theory phase space.
We argue that this algebra also underlies the phase space of electrons probing
a smeared magnetic monopole in quantum gravity by showing that upon appropriate
contractions, the algebra reduces to the noncommutative algebra of a spin foam
model of three-dimensional quantum gravity, or to the nonassociative algebra of
electrons in a background of uniform magnetic charge. We realise this set-up in
M-theory as M-waves probing a delocalised Kaluza-Klein monopole, and show that
this system also has a seven-dimensional phase space. We suggest that the
smeared Kaluza-Klein monopole is non-geometric because it cannot be described
by a local metric. This is the magnetic analogue of the local non-geometry of
the R-flux background and arises because the smeared Kaluza-Klein monopole is
described by a U(1)-gerbe rather than a U(1)-fibration.Comment: 19 pages, 2 figures; v2: dimensionful factors corrected throughout,
exposition improved; Final version to be published in JHE | Non-geometric Kaluza-Klein monopoles and magnetic duals of M-theory
R-flux backgrounds | non-geometric kaluza-klein monopoles and magnetic duals of m-theory r-flux backgrounds | analogue seven nonassociative octonionic describes branes locally geometric backgrounds. algebras automorphism covariant eight space. argue underlies probing smeared monopole contractions reduces noncommutative foam nonassociative charge. realise probing delocalised kaluza klein monopole seven space. smeared kaluza klein monopole geometric metric. analogue arises smeared kaluza klein monopole gerbe pages dimensionful corrected exposition | non_dup | [] |
84333044 | 10.1007/JHEP10(2017)145 | We study entanglement entropy in a particular tensor-scalar theory: Horndeski
gravity. Our goal is two-fold: investigate the Lewkowycz-Maldacena proposal for
entanglement entropy in the presence of a tensor-scalar coupling and address a
puzzle existing in the literature regarding the thermal entropy of
asymptotically AdS Horndeski black holes. Using the squashed cone method, i.e.
turning on a conical singularity in the bulk, we derive the functional for
entanglement entropy in Horndeski gravity. We analyze the divergence structure
of the bulk equation of motion. Demanding that the leading divergence of the
transverse component of the equation of motion vanishes we identify the surface
where to evaluate the entanglement functional. We show that the surface
obtained is precisely the one that minimizes said functional. By evaluating the
entanglement entropy functional on the horizon we obtain the thermal entropy
for Horndeski black holes; this result clarifies discrepancies in the
literature. As an application of the functional derived we find the minimal
surfaces numerically and study the entanglement plateaux.Comment: 29 pages, multiple figures. v3: sections 3.2, 3.3 and 4 sharpene | On holographic entanglement entropy of Horndeski black holes | on holographic entanglement entropy of horndeski black holes | entanglement horndeski gravity. goal lewkowycz maldacena proposal entanglement puzzle asymptotically horndeski holes. squashed cone i.e. turning conical singularity derive entanglement horndeski gravity. analyze divergence motion. demanding divergence vanishes entanglement functional. precisely minimizes said functional. evaluating entanglement horizon horndeski holes clarifies discrepancies literature. numerically entanglement pages figures. sharpene | non_dup | [] |
83859360 | 10.1007/JHEP10(2017)146 | We extend the Mellin representation of conformal field theory (CFT) to allow
for conformal boundaries and interfaces. We consider the simplest holographic
setup dual to an interface CFT - a brane filling an $AdS_{d}$ subspace of
$AdS_{d+1}$ - and perform a systematic study of Witten diagrams in this setup.
As a byproduct of our analysis, we show that geodesic Witten diagrams in this
geometry reproduce interface CFT$_d$ conformal blocks, generalizing the
analogous statement for CFTs with no defects.Comment: 38 pages, 7 figures; v2 references added, minor changes; v3 typos
corrected, derivation in 4.3 now applies to the most general case. Published
versio | The Mellin Formalism for Boundary CFT$_d$ | the mellin formalism for boundary cft$_d$ | extend mellin conformal conformal boundaries interfaces. simplest holographic setup brane filling subspace witten diagrams setup. byproduct geodesic witten diagrams reproduce conformal blocks generalizing analogous statement cfts pages minor typos corrected derivation applies case. versio | non_dup | [] |
86421052 | 10.1007/JHEP10(2017)147 | The Monster CFT plays an important role in moonshine and is also conjectured
to be the holographic dual to pure gravity in AdS3. We investigate the
entanglement and Renyi entropies of this theory along with other extremal CFTs.
The Renyi entropies of a single interval on the torus are evaluated using the
short interval expansion. Each order in the expansion contains closed form
expressions of the modular parameter. The leading terms in the q-series are
shown to precisely agree with the universal corrections to Renyi entropies at
low temperatures. Furthermore, these results are shown to match with bulk
computations of Renyi entropy using the one-loop partition function on
handlebodies. We also explore some features of Renyi entropies of two intervals
on the plane.Comment: 41 pages, 4 figures; v2: typos corrected, approximates published
versio | Monstrous entanglement | monstrous entanglement | monster plays moonshine conjectured holographic entanglement renyi entropies extremal cfts. renyi entropies torus expansion. expressions modular parameter. precisely agree universal renyi entropies temperatures. match computations renyi partition handlebodies. explore renyi entropies intervals pages typos corrected approximates versio | non_dup | [] |
83855553 | 10.1007/JHEP10(2017)148 | We propose a natural $ S_4 \times SO(10) $ supersymmetric grand unified
theory of flavour with an auxiliary $\mathbb{Z}_4^2 \times \mathbb{Z}_4^R$
symmetry, based on small Higgs representations (nothing larger than an adjoint)
and hence a type-I seesaw mechanism. The Yukawa structure of all fermions is
determined by the hierarchical vacuum expectation values of three $ S_4 $
triplet flavons, with CSD3 vacuum alignments, where up-type quarks and
neutrinos couple to one Higgs $\mathbf{10}$, and the down-type quarks and
charged leptons couple to a second Higgs $\mathbf{10}$. The Yukawa matrices are
obtained from sums of low-rank matrices, where each matrix in the sum naturally
accounts for the mass of a particular family, as in sequential dominance in the
neutrino sector, which predicts a normal neutrino mass hierarchy. The model
accurately fits all available quark and lepton data, with predictions for the
leptonic $CP$ phase in 95$\%$ credible intervals given by $ 281^\circ <
\delta^\ell < 308^\circ $ and $ 225^\circ < \delta^\ell < 253^\circ $. The
model reduces to the MSSM, with the two Higgs doublets emerging from the two
Higgs $\mathbf{10}$s without mixing, and we demonstrate how a $\mu$ term of
$\mathcal{O}$(TeV) can be realised, as well as doublet-triplet splitting, with
Planck scale operators controlled by symmetry, leading to acceptable proton
decay.Comment: 22 pages, 4 figures. Matches published versio | A natural $ S_4 \times SO(10) $ model of flavour | a natural $ s_4 \times so(10) $ model of flavour | propose supersymmetric grand unified flavour auxiliary mathbb mathbb representations nothing adjoint seesaw mechanism. yukawa fermions hierarchical expectation triplet flavons alignments quarks neutrinos couple mathbf quarks leptons couple mathbf yukawa sums naturally accounts sequential dominance predicts hierarchy. accurately fits lepton leptonic credible intervals circ delta circ circ delta circ reduces mssm doublets emerging mathbf mathcal realised doublet triplet splitting planck acceptable proton pages figures. matches versio | non_dup | [] |
84091260 | 10.1007/JHEP10(2017)149 | We consider electrically charged static nonextremal black holes in
$d$-dimensional Einstein-Maxwell-(A)dS gravity, whose horizon is a generic
Einstein space in $d-2$ dimensions. It is shown that for this system the
Hamilton-Jacobi equation is exactly solvable and admits two branches of
solutions. One of them exhibits a non-simply connected domain of integration
constants and does not reduce to the well-known solution for the $d=4$ BPS
case. The principal functions generate two first order flows that are
analytically different, but support the same general solution. One of the two
sets of flow equations corresponds to those found by L\"u, Pope and
V\'azquez-Poritz in hep-th/0307001 and (for $d=4$ and $\Lambda=0$) by Miller,
Schalm and Weinberg in hep-th/0612308. This clarifies also the reason for the
very existence of first order equations for nonextremal black holes, namely,
they are just the expressions for the conjugate momenta in terms of derivatives
of the principal function in a Hamilton-Jacobi formalism. In the last part of
our paper we analyze how much of these integrability properties generalizes to
matter-coupled $N=2$, $d=4$ gauged supergravity.Comment: 17 pages. v2: Refs. added. v3: Final version to appear in JHE | First order flow equations for nonextremal black holes in AdS
(super)gravity | first order flow equations for nonextremal black holes in ads (super)gravity | electrically nonextremal holes einstein maxwell horizon generic einstein dimensions. hamilton jacobi solvable admits branches solutions. exhibits case. principal flows analytically solution. pope azquez poritz lambda miller schalm weinberg clarifies nonextremal holes expressions conjugate momenta derivatives principal hamilton jacobi formalism. analyze integrability generalizes gauged pages. refs. added. | non_dup | [] |
83861133 | 10.1007/JHEP10(2017)151 | The measurement of the top quark mass has large systematic uncertainties
coming from the Monte Carlo simulations that are used to match theory and
experiment. We explore how much that uncertainty can be reduced by using jet
grooming procedures. We estimate the inherent ambiguity in what is meant by
Monte Carlo mass to be around 530 MeV without any corrections. This uncertainty
can be reduced by 60% to 200 MeV by calibrating to the W mass and a further 33%
to 140 MeV by applying soft-drop jet grooming (or by 20% more to 170 MeV with
trimming). At e+e- colliders, the associated uncertainty is around 110 MeV,
reducing to 50 MeV after calibrating to the W mass. By analyzing the tuning
parameters, we conclude that the importance of jet grooming after calibrating
to the W mass is to reduce sensitivity to the underlying event.Comment: 21 pages, 7 figure | Reducing the Top Quark Mass Uncertainty with Jet Grooming | reducing the top quark mass uncertainty with jet grooming | coming monte carlo match experiment. explore grooming procedures. inherent ambiguity meant monte carlo corrections. calibrating drop grooming trimming colliders reducing calibrating mass. analyzing tuning grooming calibrating pages | non_dup | [] |
83841603 | 10.1007/JHEP10(2017)152 | We revisit the notion of quantum Lie algebra of symmetries of a
noncommutative spacetime, its elements are shown to be the generators of
infinitesimal transformations and are naturally identified with physical
observables. Wave equations on noncommutative spaces are derived from a quantum
Hodge star operator. This general noncommutative geometry construction is then
exemplified in the case of k-Minkowski spacetime. The corresponding quantum
Poincare'-Weyl Lie algebra of infinitesimal translations, rotations and
dilatations is obtained. The d'Alembert wave operator coincides with the
quadratic Casimir of quantum translations and it is deformed as in Deformed
Special Relativity theories. Also momenta (infinitesimal quantum translations)
are deformed, and correspondingly the Einstein-Planck relation and the de
Broglie one. The energy-momentum relations (dispersion relations) are
consequently deduced. These results complement those of the phenomenological
literature on the subject.Comment: 30 pages. Revised version further motivating Poincare'-Weyl
(conformal) symmetry. Added explicit proof of covariance of massive scalar
fields wave equation under quantum translations (eq. (76)). To appear in JHE | Observables and Dispersion Relations in k-Minkowski Spacetime | observables and dispersion relations in k-minkowski spacetime | revisit notion symmetries noncommutative spacetime generators infinitesimal transformations naturally observables. noncommutative hodge operator. noncommutative exemplified minkowski spacetime. poincare weyl infinitesimal translations rotations dilatations obtained. alembert coincides quadratic casimir translations deformed deformed relativity theories. momenta infinitesimal translations deformed correspondingly einstein planck broglie one. deduced. complement phenomenological pages. revised motivating poincare weyl conformal symmetry. covariance massive translations | non_dup | [] |
83844468 | 10.1007/JHEP10(2017)153 | We present a new method for reconstructing CFT duals of states excited by the
bulk local operators in the three dimensional AdS black holes in the AdS/CFT
context. As an important procedure for this, we introduce a map between the
bulk points in AdS and those on the boundary where CFT lives. This gives a
systematic and universal way to express bulk local states even inside black
hole interiors. Our construction allows us to probe the interior structures of
black holes purely from the CFT calculations. We analyze bulk local states in
the single-sided black holes as well as the double-sided black holes.Comment: 38pages, Late | CFT descriptions of bulk local states in the AdS black holes | cft descriptions of bulk local states in the ads black holes | reconstructing duals excited holes context. lives. universal express interiors. interior holes purely calculations. analyze sided holes sided pages | non_dup | [] |
93939575 | 10.1007/JHEP10(2017)154 | Non-Holomorphic MSSM (NHSSM) shows various promising features that are not
easily obtained in MSSM. However, the additional Non-Holomorphic (NH) trilinear
interactions that attribute to the interesting phenomenological features, also
modify the effective scalar potential of the model significantly. We derive
analytic constraints involving trilinear parameters $A_t'$ and $A_b'$ that
exclude global charge and color breaking minima (CCB). Since the analytic
constraints are obtained considering specific directions in the
multi-dimensional field space, we further probe the applicability of these
constraints by exhaustive scan over NH parameter space with two different
regimes of $\tan\beta$ and delineate the nature of metastability by considering
vacuum expectation values for third generation squarks. We adhere to a natural
scenario by fixing Higgsino mass parameter ($\mu$) to a low value and estimate
the allowed ranges of NH trilinear parameters by considering vacuum stability
and observed properties of Higgs as the determining criteria.Comment: 29 pages, 10 figures, Results section elaborated, conclusion
unchanged, published in JHE | Exploring Charge and Color Breaking vacuum in Non-Holomorphic MSSM | exploring charge and color breaking vacuum in non-holomorphic mssm | holomorphic mssm nhssm promising mssm. holomorphic trilinear attribute phenomenological modify significantly. derive analytic involving trilinear exclude breaking minima analytic directions applicability exhaustive scan regimes beta delineate metastability expectation squarks. adhere fixing higgsino ranges trilinear determining pages elaborated unchanged | non_dup | [] |
83869840 | 10.1007/JHEP10(2017)155 | We discuss how flavour GUT models in the context of supergravity can be
completed with a simple SUSY breaking sector, such that the flavour-dependent
(non-universal) soft breaking terms can be calculated. As an example, we
discuss a model based on an SU(5) GUT symmetry and $A_4$ family symmetry, plus
additional discrete "shaping symmetries" and a $\mathbb{Z}_4^\mathrm{R}$
symmetry. We calculate the soft terms and identify the relevant high scale
input parameters, and investigate the resulting predictions for the low scale
observables, such as flavour violating processes, the sparticle spectrum and
the dark matter relic density.Comment: 24 pages, 3 figure | Predictions from a flavour GUT model combined with a SUSY breaking
sector | predictions from a flavour gut model combined with a susy breaking sector | flavour supergravity completed susy breaking flavour universal breaking calculated. shaping symmetries mathbb mathrm symmetry. observables flavour violating sparticle relic pages | non_dup | [] |
84329741 | 10.1007/JHEP10(2017)157 | We present a lattice calculation of the Hadronic Vacuum Polarization (HVP)
contribution of the strange and charm quarks to the anomalous magnetic moment
of the muon including leading-order electromagnetic corrections. We employ the
gauge configurations generated by the European Twisted Mass Collaboration
(ETMC) with $N_f = 2+1+1$ dynamical quarks at three values of the lattice
spacing ($a \simeq 0.062, 0.082, 0.089$ fm) with pion masses in the range
$M_\pi \simeq 210 - 450$ MeV. The strange and charm quark masses are tuned at
their physical values. Neglecting disconnected diagrams and after the
extrapolations to the physical pion mass and to the continuum limit we obtain:
$a_\mu^s(\alpha_{em}^2) = (53.1 \pm 2.5) \cdot 10^{-10}$,
$a_\mu^s(\alpha_{em}^3) = (-0.018 \pm 0.011) \cdot 10^{-10}$ and
$a_\mu^c(\alpha_{em}^2) = (14.75 \pm 0.56) \cdot 10^{-10}$,
$a_\mu^c(\alpha_{em}^3) = (-0.030 \pm 0.013) \cdot 10^{-10}$ for the strange
and charm contributions, respectively.Comment: 34 pages, 10 figures, 5 tables; version to appear in JHE | Strange and charm HVP contributions to the muon ($g - 2)$ including QED
corrections with twisted-mass fermions | strange and charm hvp contributions to the muon ($g - 2)$ including qed corrections with twisted-mass fermions | hadronic strange charm quarks anomalous moment muon electromagnetic corrections. employ configurations twisted etmc quarks spacing simeq pion simeq mev. strange charm tuned values. neglecting disconnected diagrams extrapolations pion continuum alpha cdot alpha cdot alpha cdot alpha cdot strange charm pages tables | non_dup | [] |
73957439 | 10.1007/JHEP10(2017)158 | The worldvolume theory of M5-branes on an ADE singularity
$\mathbb{R}^5/\Gamma_G$ can be Higgsed in various ways, corresponding to the
possible nilpotent orbits of $G$. In the F-theory dual picture, this
corresponds to activating T-brane data along two stacks of 7-branes and yields
a tensor branch realization for a large class of 6D SCFTs. In this paper, we
show that the moduli spaces and anomalies of these T-brane theories are related
in a simple, universal way to data of the nilpotent orbits. This often works in
surprising ways and gives a nontrivial confirmation of the conjectured
properties of T-branes in F-theory. We use this result to formally engineer a
class of theories where the IIA picture na\"ively breaks down. We also give a
proof of the $a$-theorem for all RG flows within this class of T-brane
theories.Comment: 49 pages, references added v2; v3 published in JHE | T-branes, Anomalies and Moduli Spaces in 6D SCFTs | t-branes, anomalies and moduli spaces in 6d scfts | worldvolume branes singularity mathbb gamma higgsed ways nilpotent orbits picture activating brane stacks branes branch realization scfts. moduli anomalies brane universal nilpotent orbits. surprising ways nontrivial confirmation conjectured branes theory. formally engineer picture ively breaks down. flows brane pages | non_dup | [] |
86413832 | 10.1007/JHEP10(2017)159 | We discuss non-linear instantons in supersymmetric field theories on curved
spaces arising from D-branes. Focusing on D3-branes and four-dimensional field
theories, we derive the supersymmetry conditions and show the intimate relation
between the instanton solutions and the non-linearly realized supersymmetries
of the field theory. We demonstrate that field theories with non-linearly
realized supersymmetries are coupled to supergravity backgrounds in a similar
fashion as those with linearly realized supersymmetries, and provide details on
how to derive such couplings from a type II perspective.Comment: 48 pages, v2: minor change | Supersymmetric branes and instantons on curved spaces | supersymmetric branes and instantons on curved spaces | instantons supersymmetric curved arising branes. focusing branes derive supersymmetry intimate instanton linearly realized supersymmetries theory. linearly realized supersymmetries supergravity backgrounds fashion linearly realized supersymmetries derive couplings pages minor | non_dup | [] |
93950423 | 10.1007/JHEP10(2017)160 | The Higgs boson discovery stirred interest in next-to-minimal supersymmetric
models, due to the apparent fine-tuning required to accommodate it in minimal
theories. To assess their naturalness, we compare fine-tuning in a
$\mathbb{Z}_3$ conserving semi-constrained Next-to-Minimal Supersymmetric
Standard Model (NMSSM) to the constrained MSSM (CMSSM). We contrast popular
fine-tuning measures with naturalness priors, which automatically appear in
statistical measures of the plausibility that a given model reproduces the weak
scale. Our comparison shows that naturalness priors provide valuable insight
into the hierarchy problem and rigorously ground naturalness in Bayesian
statistics. For the CMSSM and semi-constrained NMSSM we demonstrate qualitative
agreement between naturalness priors and popular fine tuning measures. Thus, we
give a clear plausibility argument that favours relatively light superpartners.Comment: 52 pages, 11 figures and 3 tables, Published in JHE | Bayesian analysis and naturalness of (Next-to-)Minimal Supersymmetric
Models | bayesian analysis and naturalness of (next-to-)minimal supersymmetric models | boson discovery stirred supersymmetric apparent fine tuning accommodate theories. naturalness fine tuning mathbb conserving constrained supersymmetric nmssm constrained mssm cmssm popular fine tuning naturalness priors automatically plausibility reproduces scale. naturalness priors valuable insight hierarchy rigorously naturalness bayesian statistics. cmssm constrained nmssm qualitative naturalness priors popular fine tuning measures. plausibility argument favours pages tables | non_dup | [] |
73440837 | 10.1007/JHEP10(2017)161 | The method of large spin perturbation theory allows to analyse conformal
field theories (CFT) by turning the crossing equations into an algebraic
problem. We apply this method to a generic CFT with weakly broken higher spin
(HS) symmetry, to the first non-trivial order in the breaking parameter. We
show that the spectrum of broken currents, for any value of the spin, follows
from crossing symmetry. After discussing a generic model of a single scalar
field, we focus on vector models with $O(N)$ global symmetry. We rediscover the
spectrum of several models, including the $O(N)$ Wilson-Fisher model around
four dimensions, the large $O(N)$ model in $2<d<4$ and cubic models around six
dimensions, not necessarily unitary. We also discuss models where the
fundamental field is not part of the spectrum. Examples of this are weakly
coupled gauge theories and our method gives an on-shell gauge invariant way to
study them. At first order in the coupling constant we show that again the
spectrum follows from crossing symmetry, to all values of the spin. Our method
provides an alternative to usual perturbation theory without any reference to a
Lagrangian.Comment: 30 pages,v2:typos correcte | Solving CFTs with Weakly Broken Higher Spin Symmetry | solving cfts with weakly broken higher spin symmetry | perturbation analyse conformal turning crossing algebraic problem. generic weakly broken trivial breaking parameter. broken currents crossing symmetry. discussing generic symmetry. rediscover wilson fisher cubic necessarily unitary. spectrum. weakly them. crossing spin. usual perturbation pages typos correcte | non_dup | [] |
84328156 | 10.1007/JHEP10(2017)162 | Strongly Interacting Massive Particles (SIMPs) have recently been proposed as
light thermal dark matter relics. Here we consider an explicit realization of
the SIMP mechanism in the form of vector SIMPs arising from an $SU(2)_X$ hidden
gauge theory, where the accidental custodial symmetry protects the stability of
the dark matter. We propose several ways of equilibrating the dark and visible
sectors in this setup. In particular, we show that a light dark Higgs portal
can maintain thermal equilibrium between the two sectors, as can a massive dark
vector portal with its generalized Chern-Simons couplings to the vector SIMPs,
all while remaining consistent with experimental constraints.Comment: 27 pages, 5 figures, Published versio | Vector SIMP dark matter | vector simp dark matter | interacting massive simps relics. realization simp simps arising hidden accidental custodial protects matter. propose ways equilibrating visible sectors setup. portal maintain sectors massive portal chern simons couplings simps pages versio | non_dup | [] |
86416730 | 10.1007/JHEP10(2017)164 | The scattering equation formalism for scattering amplitudes, and its stringy
incarnation, the ambitwistor string, remains a mysterious construction. In this
paper, we pursue the study a gauged-unfixed version of the ambitwistor string
known as the null string. We explore the following three aspects in detail; its
complexification, gauge fixing, and amplitudes. We first study the
complexification of the string; the associated symmetries and moduli, and
connection to the ambitwistor string. We then look in more details at the
leftover symmetry algebra of the string, called Galilean conformal algebra; we
study its local and global action and gauge-fixing. We finish by presenting an
operator formalism, that we use to compute tree-level scattering amplitudes
based on the scattering equations and a one-loop partition function. These
results hopefully will open the way to understand conceptual questions related
to the loop expansion in these twistor-like string models.Comment: References adde | The complex null string, Galilean conformal algebra and scattering
equations | the complex null string, galilean conformal algebra and scattering equations | formalism amplitudes stringy incarnation ambitwistor mysterious construction. pursue gauged unfixed ambitwistor string. explore complexification fixing amplitudes. complexification symmetries moduli connection ambitwistor string. look leftover galilean conformal fixing. finish presenting formalism amplitudes partition function. hopefully conceptual twistor adde | non_dup | [] |
84327431 | 10.1007/JHEP10(2017)165 | We study electroweak scale Dark Matter (DM) whose interactions with baryonic
matter are mediated by a heavy anomalous $Z'$. We emphasize that when the DM is
a Majorana particle, its low-velocity annihilations are dominated by loop
suppressed annihilations into the gauge bosons, rather than by p-wave or
chirally suppressed annihilations into the SM fermions. Because the $Z'$ is
anomalous, these kinds of DM models can be realized only as effective field
theories (EFTs) with a well-defined cutoff, where heavy spectator fermions
restore gauge invariance at high energies. We formulate these EFTs, estimate
their cutoff and properly take into account the effect of the Chern-Simons
terms one obtains after the spectator fermions are integrated out. We find
that, while for light DM collider and direct detection experiments usually
provide the strongest bounds, the bounds at higher masses are heavily dominated
by indirect detection experiments, due to strong annihilation into $W^+W^-$,
$ZZ$, $Z\gamma$ and possibly into $gg$ and $\gamma\gamma$. We emphasize that
these annihilation channels are generically significant because of the
structure of the EFT, and therefore these models are prone to strong indirect
detection constraints. Even though we focus on selected $Z'$ models for
illustrative purposes, our setup is completely generic and can be used for
analyzing the predictions of any anomalous $Z'$-mediated DM model with
arbitrary charges.Comment: 34 pages, 13 figures; minor plot details amended near resonance
regions, conclusions unchange | On Dark Matter Interactions with the Standard Model through an Anomalous
$Z'$ | on dark matter interactions with the standard model through an anomalous $z'$ | electroweak baryonic anomalous emphasize majorana annihilations dominated suppressed annihilations bosons chirally suppressed annihilations fermions. anomalous kinds realized efts cutoff spectator fermions restore invariance energies. formulate efts cutoff properly chern simons obtains spectator fermions out. collider strongest bounds bounds heavily dominated indirect annihilation gamma possibly gamma gamma emphasize annihilation generically prone indirect constraints. illustrative purposes setup generic analyzing anomalous pages minor amended unchange | non_dup | [] |
73961167 | 10.1007/JHEP10(2017)167 | We propose a 2D QFT generalization of the Sachdev-Ye-Kitaev model, which we
argue preserves most of its features. The UV limit of the model is described by
$N$ copies of a topological Ising CFT. The full interacting model exhibits
conformal symmetry in the IR and an emergent pseudo-Goldstone mode that arises
from broken reparametrization symmetry. We find that the effective action of
the Goldstone mode matches with the 3D AdS gravity action, viewed as a
functional of the boundary metric. We compute the spectral density and show
that the leading deviation from conformal invariance looks like a $T \bar{T}$
deformation. We comment on the relation between the IR effective action and
Liouville CFT.Comment: 2+27 pages, 4 figures; v2: ref adde | Towards a 2d QFT Analog of the SYK Model | towards a 2d qft analog of the syk model | propose generalization sachdev kitaev argue preserves features. copies topological ising cft. interacting exhibits conformal emergent pseudo goldstone arises broken reparametrization symmetry. goldstone matches viewed metric. conformal invariance looks deformation. comment liouville pages adde | non_dup | [] |
93949049 | 10.1007/JHEP10(2017)168 | The solution to the Strong CP problem is analysed within the Minimal Flavour
Violation (MFV) context. An Abelian factor of the complete flavour symmetry of
the fermionic kinetic terms may play the role of the Peccei-Quinn symmetry in
traditional axion models. Its spontaneous breaking, due to the addition of a
complex scalar field to the Standard Model scalar spectrum, generates the MFV
axion, which may redefine away the QCD theta parameter. It differs from the
traditional QCD axion for its couplings that are governed by the fermion
charges under the axial Abelian symmetry. It is also distinct from the
so-called Axiflavon, as the MFV axion does not describe flavour violation,
while it does induce flavour non-universality effects. The MFV axion
phenomenology is discussed considering astrophysical, collider and flavour
data.Comment: 12 pages, 1 table. V2: References added; version accepted for
publication in JHE | The Minimal Flavour Violating Axion | the minimal flavour violating axion | analysed flavour violation context. abelian flavour fermionic peccei quinn traditional axion models. spontaneous breaking generates axion redefine away theta parameter. differs traditional axion couplings governed fermion charges axial abelian symmetry. axiflavon axion flavour violation induce flavour universality effects. axion phenomenology astrophysical collider flavour pages table. publication | non_dup | [] |
86415436 | 10.1007/JHEP10(2017)169 | The Inverse Seesaw naturally explains the smallness of neutrino masses via an
approximate $B-L$ symmetry broken only by a correspondingly small parameter. In
this work the possible dynamical generation of the Inverse Seesaw neutrino mass
mechanism from the spontaneous breaking of a gauged $U(1)$ $B-L$ symmetry is
investigated. Interestingly, the Inverse Seesaw pattern requires a chiral
content such that anomaly cancellation predicts the existence of extra fermions
belonging to a dark sector with large, non-trivial, charges under the $U(1)$
$B-L$. We investigate the phenomenology associated to these new states and find
that one of them is a viable dark matter candidate with mass around the TeV
scale, whose interaction with the Standard Model is mediated by the $Z'$ boson
associated to the gauged $U(1)$ $B-L$ symmetry. Given the large charges
required for anomaly cancellation in the dark sector, the $B-L$ $Z'$ interacts
preferentially with this dark sector rather than with the Standard Model. This
suppresses the rate at direct detection searches and thus alleviates the
constraints on $Z'$-mediated dark matter relic abundance. The collider
phenomenology of this elusive $Z'$ is also discussed.Comment: 20 pages, 2 figures, matches published version in JHE | Dark Matter and the elusive $\mathbf{Z'}$ in a dynamical Inverse Seesaw
scenario | dark matter and the elusive $\mathbf{z'}$ in a dynamical inverse seesaw scenario | seesaw naturally explains smallness approximate broken correspondingly parameter. seesaw spontaneous breaking gauged investigated. interestingly seesaw chiral anomaly cancellation predicts extra fermions belonging trivial charges phenomenology viable candidate boson gauged symmetry. charges anomaly cancellation interacts preferentially model. suppresses searches alleviates relic abundance. collider phenomenology elusive pages matches | non_dup | [] |
78512475 | 10.1007/JHEP10(2017)170 | We argue that conformal invariance in flat spacetime implies Weyl invariance
in a general curved background metric for all unitary theories in spacetime
dimensions $d \leq 10$. We also study possible curvature corrections to the
Weyl transformations of operators, and show that these are absent for operators
of sufficiently low dimensionality and spin. We find possible `anomalous' Weyl
transformations proportional to the Weyl (Cotton) tensor for $d > 3$ ($d = 3$).
The arguments are based on algebraic consistency conditions similar to the
Wess-Zumino consistency conditions that classify possible local anomalies. The
arguments can be straightforwardly extended to larger operator dimensions and
higher $d$ with additional algebraic complexity.Comment: 30 pages, v3: Version accepted to JHEP, clarifications added and
typos fixe | Weyl versus Conformal Invariance in Quantum Field Theory | weyl versus conformal invariance in quantum field theory | argue conformal invariance spacetime weyl invariance curved unitary spacetime curvature weyl transformations absent sufficiently dimensionality spin. anomalous weyl transformations weyl cotton arguments algebraic consistency wess zumino consistency classify anomalies. arguments straightforwardly algebraic pages jhep clarifications typos fixe | non_dup | [] |
83864170 | 10.1007/JHEP10(2017)171 | In this paper we propose that bubbles of AdS within Minkowski spacetime,
stabilized at a finite radius by stiff matter and an electromagnetic gas, can
be an alternative endpoint of gravitational collapse. The bubbles are
horizonless with a size up to 12.5% larger than their Schwarzschild radius
depending on their charge. We argue that they are stable against small
perturbations, and have thermodynamical properties similar to those of real
black holes. We provide a realization of the bubbles within string theory that
relies on a specific brane intersection giving rise to a shell carrying
dissolved charges from lower dimensional D-branes as well as a gas of open
strings. We also note that our construction provides a new way of understanding
the entropy of Reissner-Nordstr\"om black holes in the extremal limit.Comment: References and a few comments added. Published versio | Black holes as bubbles of AdS | black holes as bubbles of ads | propose bubbles minkowski spacetime stabilized stiff electromagnetic endpoint gravitational collapse. bubbles horizonless schwarzschild charge. argue perturbations thermodynamical holes. realization bubbles relies brane intersection giving carrying dissolved charges branes strings. reissner nordstr holes extremal comments added. versio | non_dup | [] |
84091312 | 10.1007/JHEP10(2017)172 | We discuss the bi-local collective theory for the $\mathcal{N}=1,2$
supersymmetric Sachdev-Ye-Kitaev (SUSY SYK) models. We construct a bi-local
superspace, and formulate the bi-local collective superfield theory of the
one-dimensional SUSY vector model. The bi-local collective theory provides
systematic analysis of the SUSY SYK models. We find that this bi-local
collective theory naturally leads to supermatrix formulation in the bi-local
superspace. This supermatrix formulation drastically simplifies the analysis of
the SUSY SYK models. We also study $\mathcal{N}=1$ bi-local superconformal
generators in the supermatrix formulation, and find the eigenvectors of teh
superconformal Casimir. We diagonalize the quadratic action in large $N$
expansion.Comment: 48 page; v2:typo corrected, reference added, notation for the
eigenfunctions change | Supersymmetric SYK Model: Bi-local Collective Superfield/Supermatrix
Formulation | supersymmetric syk model: bi-local collective superfield/supermatrix formulation | collective mathcal supersymmetric sachdev kitaev susy models. superspace formulate collective superfield susy model. collective susy models. collective naturally supermatrix formulation superspace. supermatrix formulation drastically simplifies susy models. mathcal superconformal generators supermatrix formulation eigenvectors superconformal casimir. diagonalize quadratic typo corrected notation eigenfunctions | non_dup | [] |
83871171 | 10.1007/JHEP10(2017)173 | We consider the lagrangian description of Argyres-Douglas theories of type
$A_{2N-1}$, which is a $SU(N)$ gauge theory with an adjoint and one fundamental
flavor. An appropriate reformulation allows us to map the moduli space of vacua
across the duality, and to dimensionally reduce. Going down to three
dimensions, we find that the adjoint SQCD "abelianizes": in the infrared it is
equivalent to a $\mathcal{N}=4$ linear quiver theory. Moreover, we study the
mirror dual: using a monopole duality to "sequentially confine" quivers tails
with balanced nodes, we show that the mirror RG flow lands on $\mathcal{N}=4$
SQED with $N$ flavors. These results provide a physical derivation of previous
proposals for the three dimensional mirror of AD theories.Comment: 45 pages, clarifications and sequential RG flow to the 3d mirror of
A_3 theory added. JHEP versio | Abelianization and Sequential Confinement in $2+1$ dimensions | abelianization and sequential confinement in $2+1$ dimensions | lagrangian argyres douglas adjoint flavor. reformulation moduli vacua duality dimensionally reduce. going adjoint sqcd abelianizes infrared mathcal quiver theory. mirror monopole duality sequentially confine quivers tails balanced mirror lands mathcal sqed flavors. derivation proposals mirror pages clarifications sequential mirror added. jhep versio | non_dup | [] |
86415414 | 10.1007/JHEP10(2017)175 | In this paper we reconsider the Cachazo-He-Yuan construction (CHY) of the so
called scattering amplitudes at one-loop, in order to obtain quadratic
propagators. In theories with colour ordering the key ingredient is the
redefinition of the Parke-Taylor factors. After classifying all the possible
one-loop CHY-integrands we conjecture a new one-loop amplitude for the massless
Bi-adjoint $\Phi^3$ theory. The prescription directly reproduces the quadratic
propagators from of the traditional Feynman approach.Comment: 43 pages, new appendix added, few typos corrected. Accepted for
publication in JHE | One-loop Parke-Taylor factors for quadratic propagators from massless
scattering equations | one-loop parke-taylor factors for quadratic propagators from massless scattering equations | reconsider cachazo yuan amplitudes quadratic propagators. colour ordering ingredient redefinition parke taylor factors. classifying integrands conjecture massless adjoint theory. prescription reproduces quadratic propagators traditional feynman pages typos corrected. publication | non_dup | [] |
86414897 | 10.1007/JHEP10(2017)176 | Unified theories of strong, weak and electromagnetic interactions which have
electric charge quantization predict the existence of topologically stable
magnetic monopoles. Intermediate scale monopoles are comparable with detection
energies of cosmic ray monopoles at IceCube and other cosmic ray experiments.
Magnetic monopoles in some models can be significantly lighter and carry two,
three or possibly even higher quanta of the Dirac magnetic charge. They could
be light enough for their effects to be detected at the LHC either directly or
indirectly. An example based on a D-brane inspired $SU(3)_C\times SU(3)_L\times
SU(3)_R$ (trinification) model with the monopole carrying three quanta of Dirac
magnetic charge is presented. These theories also predict the existence of
color singlet states with fractional electric charge which may be accessible at
the LHC.Comment: 18 pages, 2 figures, minor revisions, references adde | Magnetic Monopoles and Free Fractionally Charged States at Accelerators
and in Cosmic Rays | magnetic monopoles and free fractionally charged states at accelerators and in cosmic rays | unified electromagnetic quantization predict topologically monopoles. monopoles comparable cosmic monopoles icecube cosmic experiments. monopoles lighter carry possibly quanta dirac charge. indirectly. brane inspired trinification monopole carrying quanta dirac presented. predict singlet fractional accessible pages minor revisions adde | non_dup | [] |
93937503 | 10.1007/JHEP10(2017)177 | R-parity and baryon number violating operators can be allowed in the
Supersymmetric Standard Model and thus lead to interesting baryon number
violating processes such as neutron-antineutron oscillations and baryogenesis
of the Universe via the decay of the lightest supersymmetric particle (LSP).
Adopting the LSP baryogenesis mechanism realized by the late decay of the
axino, we identify a single coupling lambda''_313 as a common origin for the
matter-antimatter asymmetry of the Universe as well as potentially observable
neutron-antineutron oscillation rates. From this, rather strong constraints on
the supersymmetry breaking masses and the axion decay constant are obtained.
The favoured parameter space of lambda''_313 ~ 0.1 and sub-TeV masses for the
relevant sparticles is readily accessible by the current and future LHC
searches.Comment: 17 pages, 6 figures, added references, version accepted for
publication in JHE | LSP baryogenesis and neutron-antineutron oscillations from R-parity
violation | lsp baryogenesis and neutron-antineutron oscillations from r-parity violation | parity baryon violating supersymmetric baryon violating neutron antineutron oscillations baryogenesis universe lightest supersymmetric adopting baryogenesis realized axino lambda antimatter asymmetry universe potentially observable neutron antineutron oscillation rates. supersymmetry breaking axion obtained. favoured lambda sparticles readily accessible pages publication | non_dup | [] |
93951383 | 10.1007/JHEP10(2017)179 | We present the complete set of vertex, wave function and charge
renormalisation constants in QCD in a general simple gauge group and with the
complete dependence on the covariant gauge parameter $\xi$ in the minimal
subtraction scheme of conventional dimensional regularisation. Our results
confirm all already known results, which were obtained in the Feynman gauge,
and allow the extraction of other useful gauges such as the Landau gauge. We
use these results to extract the Landau gauge five-loop anomalous dimensions of
the composite operator $A^2$ as well as the Landau gauge scheme independent
gluon, ghost and fermion propagators at five loops.Comment: 17 pages; FORM and Mathematica result files available with the
source; corrected minor typos, added references, journal ref, 1 remark, 1
note and 1 additional result fil | Five-loop renormalisation of QCD in covariant gauges | five-loop renormalisation of qcd in covariant gauges | renormalisation covariant subtraction regularisation. confirm feynman extraction gauges landau gauge. extract landau anomalous composite landau gluon ghost fermion propagators pages mathematica files corrected minor typos remark | non_dup | [] |
84328462 | 10.1007/JHEP10(2017)183 | In this paper, we study an SYK model and an SYK-like tensor model with global
symmetry. First, we study the large $N$ expansion of the bi-local collective
action for the SYK model with manifest global symmetry. We show that the global
symmetry is enhanced to a local symmetry at strong coupling limit, and the
corresponding symmetry algebra is the Kac-Moody algebra. The emergent local
symmetry together with the emergent reparametrization is spontaneously and
explicit broken. This leads to a low energy effective action. We evaluate four
point functions, and obtain spectrum of our model. We derive the low energy
effective action and analyze the chaotic behavior of the four point functions.
We also consider the recent 3D gravity conjecture for our model.
We also introduce an SYK-like tensor model with global symmetry. We first
study chaotic behavior of four point functions in various channels for the
rank-3 case, and generalize this into a rank-$(q-1)$ tensor model.Comment: 61 pages, 8 figures; v2: typos corrected, references added, appendix
D revised; v3: typos corrected, 1 figure added for clarification, substantial
revisions and clarifications (conclusions unchanged | SYK Models and SYK-like Tensor Models with Global Symmetry | syk models and syk-like tensor models with global symmetry | symmetry. collective manifest symmetry. moody algebra. emergent emergent reparametrization spontaneously broken. action. model. derive analyze chaotic functions. conjecture model. symmetry. chaotic generalize pages typos corrected revised typos corrected clarification substantial revisions clarifications unchanged | non_dup | [] |
86413889 | 10.1007/JHEP10(2017)185 | Anti-D3 branes and non-perturbative effects in flux compactifications
spontaneously break supersymmetry and stabilise moduli in a metastable de
Sitter vacua. The low energy 4D effective field theory description for such
models would be a supergravity theory with non-linearly realised supersymmetry.
Guided by string theory modular symmetry, we compute this non-linear
supergravity theory, including dependence on all bulk moduli. Using either a
constrained chiral superfield or a constrained vector field, the uplifting
contribution to the scalar potential from the anti-D3 brane can be
parameterised either as an F-term or Fayet-Iliopoulos D-term. Using again the
modular symmetry, we show that 4D non-linear supergravities that descend from
string theory have an enhanced protection from quantum corrections by
non-renormalisation theorems. The superpotential giving rise to metastable de
Sitter vacua is robust against perturbative string-loop and $\alpha'$
corrections.Comment: 33 page | Anti-D3 branes and moduli in non-linear supergravity | anti-d3 branes and moduli in non-linear supergravity | branes perturbative compactifications spontaneously break supersymmetry stabilise moduli metastable sitter vacua. supergravity linearly realised supersymmetry. guided modular supergravity moduli. constrained chiral superfield constrained uplifting brane parameterised fayet iliopoulos term. modular supergravities descend protection renormalisation theorems. superpotential giving metastable sitter vacua robust perturbative alpha | non_dup | [] |
83858103 | 10.1007/JHEP10(2017)186 | In this work we present for the first time predictions for top-quark pair
differential distributions at the LHC at NNLO QCD accuracy and including EW
corrections. For the latter we include not only contributions of ${\cal
O}(\alpha_s^2 \alpha)$, but also those of order ${\cal O}(\alpha_s \alpha^2)$
and ${\cal O}( \alpha^3)$. Besides providing phenomenological predictions for
all main differential distributions with stable top quarks, we also study the
following issues. 1) The effect of the photon PDF on top-pair spectra: we find
it to be strongly dependent on the PDF set used -- especially for the top $p_T$
distribution. 2) The difference between the additive and multiplicative
approaches for combining QCD and EW corrections: with our scale choice, we find
relatively small differences between the central predictions, but reduced scale
dependence within the multiplicative approach. 3) The potential effect from the
radiation of heavy bosons on inclusive top-pair spectra: we find it to be,
typically, negligible.Comment: 22 pages, 7 figures, version published in JHEP, results are attached
in electronic form, results and additional material available from this
website: http://www.precision.hep.phy.cam.ac.uk/results/ttbar-nnloqcd-nloew | Top-pair production at the LHC through NNLO QCD and NLO EW | top-pair production at the lhc through nnlo qcd and nlo ew | nnlo corrections. alpha alpha alpha alpha alpha besides phenomenological quarks issues. distribution. additive multiplicative combining multiplicative approach. bosons inclusive pages jhep attached website ttbar nnloqcd nloew | non_dup | [] |
86421047 | 10.1007/JHEP10(2017)187 | The butterfly velocity characterizes the spread of correlations in a quantum
system. Recent work has provided a method of calculating the butterfly velocity
of a class of boundary operators using holographic duality. Utilizing this and
a presumed extension of the canonical holographic correspondence of AdS/CFT, we
investigate the butterfly velocities of operators with bulk duals living in
general spacetimes. We analyze some ubiquitous issues in calculating butterfly
velocities using the bulk effective theory, and then extend the previously
proposed method to include operators in entanglement shadows. We explicitly
compute butterfly velocities for bulk local operators in the holographic theory
of flat Friedmann-Robertson-Walker spacetimes and find a universal scaling
behavior for the spread of operators in the boundary theory, independent of
dimension and fluid components. This result may suggest that a Lifshitz field
theory with z = 4 is the appropriate holographic dual for these spacetimes.Comment: 14 pages, 3 figures; fixed calculational error, removed the
associated erroneous discussions on monotonicit | Butterfly Velocities for Holographic Theories of General Spacetimes | butterfly velocities for holographic theories of general spacetimes | butterfly characterizes spread system. calculating butterfly holographic duality. utilizing presumed canonical holographic correspondence butterfly velocities duals living spacetimes. analyze ubiquitous calculating butterfly velocities extend entanglement shadows. explicitly butterfly velocities holographic friedmann robertson walker spacetimes universal spread components. lifshitz holographic pages calculational removed erroneous discussions monotonicit | non_dup | [] |
84093192 | 10.1007/JHEP10(2017)188 | We investigate the ability of the $S_3$ scalar leptoquark to address the
recent hints of lepton universality violation in $B$ meson decays. The $S_3$
leptoquark with quantum numbers $(\overline{\mathbf{3}},\mathbf{3},1/3)$
naturally emerges in the context of an $SU(5)$ GUT model without any conflict
with the stringent limits from observed nucleon stability. Scalar leptoquark
$S_3$ with left-handed couplings to 2nd and 3rd generations of charged leptons
and down-type quarks seems well-suited to address both $R_{K^{(*)}}$ and
$R_{D^{(*)}}$. We quantify this suitability with numerical fits to a plethora
of relevant flavor observables. The proposed $SU(5)$ model calls for a second
leptoquark state, i.e., $\tilde{R}_2$ with quantum numbers
$(\mathbf{3},\mathbf{2},1/6)$, if one is to generate gauge coupling unification
and neutrino mass. We accordingly include it in our study to investigate
$\tilde{R}_2$'s ability to offset adverse effects of $S_3$ and thus improve a
quality of numerical fits. A global fit of the leptoquark Yukawa couplings
shows that large couplings of light $S_3$ to $\tau$ leptons are preferred. We
furthermore identify $B \to K^{(*)} \bar\nu\nu$ as the most sensitive channel
to probe the preferred region of parameter space. Large couplings of $S_3$ to
$\tau$ leptons are finally confronted with the experimental searches for $\tau$
final states at the Large Hadron Collider. These searches comprise a study of
decay products of the leptoquark pair production, as well as, and more
importantly, an analysis of the high-mass $\tau\tau$ final states.Comment: Published version. 32 pages, 6 figure | The role of the $S_3$ GUT leptoquark in flavor universality and collider
searches | the role of the $s_3$ gut leptoquark in flavor universality and collider searches | leptoquark hints lepton universality violation meson decays. leptoquark overline mathbf mathbf naturally emerges conflict stringent nucleon stability. leptoquark handed couplings generations leptons quarks suited quantify suitability fits plethora flavor observables. calls leptoquark i.e. tilde mathbf mathbf unification mass. accordingly tilde offset adverse fits. leptoquark yukawa couplings couplings leptons preferred. preferred space. couplings leptons confronted searches hadron collider. searches comprise leptoquark importantly version. pages | non_dup | [] |
84332946 | 10.1007/JHEP10(2017)189 | We consider the structure of current and stress tensor two-point functions in
conformal field theory with a boundary. The main result of this paper is a
relation between a boundary central charge and the coefficient of a
displacement operator correlation function in the boundary limit. The boundary
central charge under consideration is the coefficient of the product of the
extrinsic curvature and the Weyl curvature in the conformal anomaly. Along the
way, we describe several auxiliary results. Three of the more notable are as
follows: (1) we give the bulk and boundary conformal blocks for the current
two-point function; (2) we show that the structure of these current and stress
tensor two-point functions is essentially universal for all free theories; (3)
we introduce a class of interacting conformal field theories with boundary
degrees of freedom, where the interactions are confined to the boundary. The
most interesting example we consider can be thought of as the infrared fixed
point of graphene. This particular interacting conformal model in four
dimensions provides a counterexample of a previously conjectured relation
between a boundary central charge and a bulk central charge. The model also
demonstrates that the boundary central charge can change in response to
marginal deformations.Comment: 75 pages, 4 figures; v2: references added. v3: comments on anomalous
dimension and references added. v4: minor corrections, published versio | Boundary Conformal Field Theory and a Boundary Central Charge | boundary conformal field theory and a boundary central charge | conformal boundary. displacement limit. consideration extrinsic curvature weyl curvature conformal anomaly. auxiliary results. notable conformal blocks essentially universal interacting conformal freedom confined boundary. thought infrared graphene. interacting conformal counterexample conjectured charge. demonstrates marginal pages added. comments anomalous added. minor versio | non_dup | [] |
86413714 | 10.1007/JHEP10(2017)190 | We derive the Bekenstein-Hawking entropy for a class of BPS black holes in
the massive type IIA supergravity background AdS$_4 \times S^6$ from a
microscopic counting of supersymmetric ground states in a holographically dual
field theory. The counting is performed by evaluating the topologically twisted
index of three-dimensional $\mathcal{N}=2$ Chern-Simons-matter gauge theories
in the large $N$ limit. The $\mathcal{I}$-extremization principle is shown to
match the attractor mechanism for the near-horizon geometries constructed in
the four-dimensional dyonic $\mathcal{N}=2$ gauged supergravity, that arises as
a consistent truncation of massive type IIA supergravity on $S^6$. In
particular, our results prove that the imaginary part of the three-dimensional
partition functions plays a crucial r\^ole in holography.Comment: 33 pages; v2: ref added, typos corrected; v3: published versio | Holographic microstate counting for AdS$_4$ black holes in massive IIA
supergravity | holographic microstate counting for ads$_4$ black holes in massive iia supergravity | derive bekenstein hawking holes massive supergravity microscopic counting supersymmetric holographically theory. counting evaluating topologically twisted mathcal chern simons limit. mathcal extremization match attractor horizon geometries dyonic mathcal gauged supergravity arises truncation massive supergravity imaginary partition plays crucial pages typos corrected versio | non_dup | [] |
93943229 | 10.1007/JHEP10(2017)191 | We calculate a class of three-loop Feynman diagrams which contribute to the
next-to-next-to-leading logarithmic approximation for the width difference
$\Delta\Gamma_{s}$ in the $B_s-\bar{B}_s$ system. The considered diagrams
contain a closed fermion loop in a gluon propagator and constitute the order
$\alpha_s^2 N_f$, where $N_f$ is the number of light quarks. Our results entail
a considerable correction in that order, if $\Delta\Gamma_{s}$ is expressed in
terms of the pole mass of the bottom quark. If the $\overline{MS}$ scheme is
used instead, the correction is much smaller. As a result, we find a decrease
of the scheme dependence. Our result also indicates that the usually quoted
value of the NLO renormalization scale dependence underestimates the
perturbative error.Comment: We corrected a typographical mistake in Eq. (4.18), made larger axis
labels in Fig.2. Version accepted by JHE | Towards next-to-next-to-leading-log accuracy for the width difference in
the $B_s-\bar{B}_s$ system: fermionic contributions to order $(m_c/m_b)^0$
and $(m_c/m_b)^1$ | towards next-to-next-to-leading-log accuracy for the width difference in the $b_s-\bar{b}_s$ system: fermionic contributions to order $(m_c/m_b)^0$ and $(m_c/m_b)^1$ | feynman diagrams logarithmic delta gamma system. diagrams fermion gluon propagator constitute alpha quarks. entail considerable delta gamma pole quark. overline smaller. dependence. quoted renormalization underestimates perturbative corrected typographical mistake labels fig. | non_dup | [] |
84329709 | 10.1007/JHEP10(2017)192 | An interesting result in particle astrophysics is the recent detection of an
unexplained 3.5 keV line from galaxy clusters. A promising model, which can
explain the morphology of the signal and its non-observation in dwarf
spheroidal galaxies, involves a 7 keV dark matter particle decaying into a pair
of ultra-light axions that convert into photons in the magnetic field of the
clusters. Given that light axions emerge naturally in 4D string vacua, in this
paper we present a microscopic realisation of this model within the framework
of type IIB flux compactifications. Dark matter is a local closed string axion
which develops a tiny mass due to subdominant poly-instanton corrections to the
superpotential and couples via kinetic mixing to an almost massless open string
axion living on a D3-brane at a singularity. The interaction of this
ultra-light axion with photons is induced by U(1) kinetic mixing. After
describing the Calabi-Yau geometry and the brane set-up, we discuss in depth
moduli stabilisation, the resulting mass spectrum and the strength of all
relevant couplings.Comment: 27 pages + appendices, 1 figure; typos corrected, references added,
additional comments on the cosmological history and DM production in the
conclusion | The 3.5 keV Line from Stringy Axions | the 3.5 kev line from stringy axions | astrophysics unexplained clusters. promising morphology dwarf spheroidal involves decaying ultra axions convert photons clusters. axions emerge naturally vacua microscopic realisation compactifications. axion develops tiny subdominant poly instanton superpotential couples massless axion living brane singularity. ultra axion photons mixing. describing calabi brane moduli stabilisation pages appendices typos corrected comments cosmological | non_dup | [] |
84327817 | 10.1007/JHEP10(2017)193 | We construct a new class of metastable de Sitter vacua of flux
compactifications of type IIB string theory. These solutions provide a natural
extension of the `Large Volume Scenario' anti-de Sitter vacua, and can
analogously be realised at parametrically large volume and weak string
coupling, using standard ${\cal N}=1$ supergravity. For these new vacua, a
positive vacuum energy is achieved from the inclusion of a small amount of
flux-induced supersymmetry breaking in the complex structure and axio-dilaton
sector, and no additional `uplift' contribution (e.g.~from anti-branes) is
required. We show that the approximate no-scale structure of the effective
theory strongly influences the spectrum of the stabilised moduli: one complex
structure modulus remains significantly lighter than the supersymmetry breaking
scale, and metastability requires only modest amounts of tuning. After
discussing these general results, we provide a recipe for constructing de
Sitter vacua on a given compactification manifold, and give an explicit example
of a de Sitter vacuum for the compactification on the Calabi-Yau orientifold
realised in $\mathbb{CP}^4_{11169}$. Finally, we note that these solutions have
intriguing implications for phenomenology, predicting no superpartners in the
spectrum below $\sim$50 TeV, and no WIMP dark matter.Comment: 34 page | A New Class of de Sitter Vacua in Type IIB Large Volume
Compactifications | a new class of de sitter vacua in type iib large volume compactifications | metastable sitter vacua compactifications theory. sitter vacua analogously realised parametrically supergravity. vacua inclusion supersymmetry breaking axio dilaton uplift e.g. branes required. approximate influences stabilised moduli modulus lighter supersymmetry breaking metastability modest amounts tuning. discussing recipe constructing sitter vacua compactification manifold sitter compactification calabi orientifold realised mathbb intriguing phenomenology predicting superpartners wimp | non_dup | [] |
93936478 | 10.1007/JHEP10(2017)194 | We compare the gauging of the Bargmann algebra, for the case of arbitrary
torsion, with the result that one obtains from a null-reduction of General
Relativity. Whereas the two procedures lead to the same result for
Newton-Cartan geometry with arbitrary torsion, the null-reduction of the
Einstein equations necessarily leads to Newton-Cartan gravity with zero
torsion. We show, for three space-time dimensions, how Newton-Cartan gravity
with arbitrary torsion can be obtained by starting from a Schroedinger field
theory with dynamical exponent z=2 for a complex compensating scalar and next
coupling this field theory to a z=2 Schroedinger geometry with arbitrary
torsion. The latter theory can be obtained from either a gauging of the
Schroedinger algebra, for arbitrary torsion, or from a null-reduction of
conformal gravity.Comment: 21 page | Newton-Cartan Gravity and Torsion | newton-cartan gravity and torsion | gauging bargmann torsion obtains relativity. newton cartan torsion einstein necessarily newton cartan torsion. newton cartan torsion schroedinger exponent compensating schroedinger torsion. gauging schroedinger torsion conformal | non_dup | [] |
83832162 | 10.1007/JHEP10(2017)196 | We perform a phenomenological analysis of the $\cos 2 \phi $ azimuthal
asymmetry in virtual photon plus jet production induced by the linear
polarization of gluons in unpolarized $pA$ collisions. Although the linearly
polarized gluon distribution becomes maximal at small $x$, TMD evolutionleads
to a Sudakov suppression of the asymmetry with increasing invariant mass of the
$\gamma^*$-jet pair. Employing a small-$x$ model input distribution, the
asymmetry is found to be strongly suppressed under TMD evolution, but still
remains sufficiently large to be measurable in the typical kinematical region
accessible at RHIC or LHC at moderate photon virtuality, whereas it is expected
to be negligible in $Z/W$-jet pair production at LHC. We point out the optimal
kinematics for RHIC and LHC studies, in order to expedite the first
experimental studies of the linearly polarized gluon distribution through this
process. We further argue that this is a particularly clean process to test the
$k_t$-resummation formalism in the small-$x$ regime.Comment: 11 pages, 6 figure | Suppression of maximal linear gluon polarization in angular asymmetries | suppression of maximal linear gluon polarization in angular asymmetries | phenomenological azimuthal asymmetry virtual gluons unpolarized collisions. linearly polarized gluon maximal evolutionleads sudakov suppression asymmetry gamma pair. employing asymmetry suppressed sufficiently measurable kinematical accessible rhic moderate virtuality negligible lhc. kinematics rhic expedite linearly polarized gluon process. argue clean resummation formalism pages | non_dup | [] |
86414519 | 10.1007/JHEP10(2017)197 | We consider the Regge limit of the CFT correlation functions $\langle {\cal
J} {\cal J} {\cal O}{\cal O}\rangle$ and $\langle TT {\cal O}{\cal O}\rangle$,
where ${\cal J}$ is a vector current, $T$ is the stress tensor and ${\cal O}$
is some scalar operator. These correlation functions are related by a type of
Fourier transform to the AdS phase shift of the dual 2-to-2 scattering process.
AdS unitarity was conjectured some time ago to be positivity of the imaginary
part of this bulk phase shift. This condition was recently proved using purely
CFT arguments. For large $N$ CFTs we further expand on these ideas, by
considering the phase shift in the Regge limit, which is dominated by the
leading Regge pole with spin $j(\nu)$, where $\nu$ is a spectral parameter. We
compute the phase shift as a function of the bulk impact parameter, and then
use AdS unitarity to impose bounds on the analytically continued OPE
coefficients $C_{{\cal J}{\cal J}j(\nu)}$ and $C_{TTj(\nu)}$ that describe the
coupling to the leading Regge trajectory of the current ${\cal J}$ and stress
tensor $T$. AdS unitarity implies that the OPE coefficients associated to
non-minimal couplings of the bulk theory vanish at the intercept value $\nu=0$,
for any CFT. Focusing on the case of large gap theories, this result can be
used to show that the physical OPE coefficients $C_{{\cal J}{\cal J}T}$ and
$C_{TTT}$, associated to non-minimal bulk couplings, scale with the gap
$\Delta_g$ as $\Delta_g^{-2}$ or $\Delta_g^{-4}$. Also, looking directly at the
unitarity condition imposed at the OPE coefficients $C_{{\cal J}{\cal J}T}$ and
$C_{TTT}$ results precisely in the known conformal collider bounds, giving a
new CFT derivation of these bounds. We finish with remarks on finite $N$
theories and show directly in the CFT that the spin function $j(\nu)$ is
convex, extending this property to the continuation to complex spin.Comment: 47 pages, 3 figures, v2: JHEP versio | Bounds for OPE coefficients on the Regge trajectory | bounds for ope coefficients on the regge trajectory | regge langle rangle langle rangle operator. fourier transform process. unitarity conjectured positivity imaginary shift. proved purely arguments. cfts expand ideas regge dominated regge pole parameter. unitarity impose bounds analytically continued regge trajectory unitarity couplings vanish intercept cft. focusing couplings delta delta delta looking unitarity imposed precisely conformal collider bounds giving derivation bounds. finish remarks convex extending continuation pages jhep versio | non_dup | [] |
83869750 | 10.1007/JHEP10(2017)198 | We determine the small-$x$ asymptotics of the gluon helicity distribution in
a proton at leading order in perturbative QCD at large $N_c$. To achieve this,
we begin by evaluating the dipole gluon helicity TMD at small $x$. In the
process we obtain an interesting new result: in contrast to the unpolarized
dipole gluon TMD case, the operator governing the small-$x$ behavior of the
dipole gluon helicity TMD is different from the operator corresponding to the
polarized dipole scattering amplitude (used in our previous work to determine
the small-$x$ asymptotics of the quark helicity distribution). We then
construct and solve novel small-$x$ large-$N_c$ evolution equations for the
operator related to the dipole gluon helicity TMD. Our main result is the
small-$x$ asymptotics for the gluon helicity distribution: $\Delta G \sim
\left( \tfrac{1}{x} \right)^{\alpha_h^G}$ with $\alpha_h^G = \tfrac{13}{4
\sqrt{3}} \, \sqrt{\tfrac{\alpha_s \, N_c}{2 \pi}} \approx 1.88 \,
\sqrt{\tfrac{\alpha_s \, N_c}{2 \pi}}$. We note that the power $\alpha_h^G$ is
approximately 20$\%$ lower than the corresponding power $\alpha_h^q$ for the
small-$x$ asymptotics of the quark helicity distribution defined by $\Delta q
\sim \left( \tfrac{1}{x} \right)^{\alpha_h^q}$ with $\alpha_h^q =
\tfrac{4}{\sqrt{3}} \, \sqrt{\tfrac{\alpha_s \, N_c}{2 \pi}} \approx 2.31 \,
\sqrt{\tfrac{\alpha_s \, N_c}{2 \pi}}$ found in our earlier work.Comment: 36 pages, 9 figures; v3: minus signs and factors of 2 corrected, main
results remained the sam | Small-$x$ Asymptotics of the Gluon Helicity Distribution | small-$x$ asymptotics of the gluon helicity distribution | asymptotics gluon helicity proton perturbative begin evaluating dipole gluon helicity unpolarized dipole gluon governing dipole gluon helicity polarized dipole asymptotics helicity solve dipole gluon helicity tmd. asymptotics gluon helicity delta tfrac alpha alpha tfrac sqrt sqrt tfrac alpha approx sqrt tfrac alpha alpha alpha asymptotics helicity delta tfrac alpha alpha tfrac sqrt sqrt tfrac alpha approx sqrt tfrac alpha pages minus signs corrected remained | non_dup | [] |
84093933 | 10.1007/JHEP10(2017)199 | Relativistic quantum systems that admit scattering experiments are
quantitatively described by effective field theories, where $S$-matrix
kinematics and symmetry considerations are encoded in the operator spectrum of
the EFT. In this paper we use the $S$-matrix to derive the structure of the EFT
operator basis, providing complementary descriptions in (i) position space
utilizing the conformal algebra and cohomology and (ii) momentum space via an
algebraic formulation in terms of a ring of momenta with kinematics implemented
as an ideal. These frameworks systematically handle redundancies associated
with equations of motion (on-shell) and integration by parts (momentum
conservation).
We introduce a partition function, termed the Hilbert series, to enumerate
the operator basis--correspondingly, the $S$-matrix--and derive a matrix
integral expression to compute the Hilbert series. The expression is general,
easily applied in any spacetime dimension, with arbitrary field content and
(linearly realized) symmetries.
In addition to counting, we discuss construction of the basis. Simple
algorithms follow from the algebraic formulation in momentum space. We
explicitly compute the basis for operators involving up to $n=5$ scalar fields.
This construction universally applies to fields with spin, since the operator
basis for scalars encodes the momentum dependence of $n$-point amplitudes.
We discuss in detail the operator basis for non-linearly realized symmetries.
In the presence of massless particles, there is freedom to impose additional
structure on the $S$-matrix in the form of soft limits. The most na\"ive
implementation for massless scalars leads to the operator basis for pions,
which we confirm using the standard CCWZ formulation for non-linear
realizations.Comment: 75 pages plus appendice | Operator bases, $S$-matrices, and their partition functions | operator bases, $s$-matrices, and their partition functions | relativistic admit quantitatively kinematics considerations encoded eft. derive complementary descriptions utilizing conformal cohomology algebraic formulation momenta kinematics implemented ideal. frameworks systematically handle redundancies conservation partition termed hilbert enumerate correspondingly derive hilbert series. spacetime linearly realized symmetries. counting basis. algebraic formulation space. explicitly involving fields. universally applies scalars encodes amplitudes. linearly realized symmetries. massless freedom impose limits. massless scalars pions confirm ccwz formulation pages appendice | non_dup | [] |
93942870 | 10.1007/JHEP10(2017)200 | We study the finite temperature properties of a recently introduced string
bit model designed to capture some features of the emergent string in the
tensionless limit. The model consists of a pair of bosonic and fermionic bit
operators transforming in the adjoint representation of the color group SU(N).
Color confinement is not achieved as a dynamical effect, but instead is
enforced by an explicit singlet projection. At large N and finite temperature,
the model has a non trivial thermodynamics. In particular, there is a Hagedorn
type transition at a finite temperature $T=T_H$ where the string degrees of
freedom are liberated and the free energy gets a large contribution $\sim
N^{2}$ that plays the role of an order parameter. For $T>T_H$, the low
temperature phase becomes unstable. In the new phase, the thermodynamically
favoured configurations are characterized by a non-trivial gapped density of
the SU(N) angles associated with the singlet projection. We present an accurate
algorithm for the determination of the density profile at $N=\infty$. In
particular, we determine the gap endpoint at generic temperature and analytical
expansions valid near the Hagedorn transition as well as at high temperature.
The leading order corrections are characterized by non-trivial exponents that
are determined analytically and compared with explicit numerical calculations.Comment: 15 pages, 8 pdf figure | Thermal properties of a string bit model at large N | thermal properties of a string bit model at large n | capture emergent tensionless limit. bosonic fermionic transforming adjoint confinement enforced singlet projection. trivial thermodynamics. hagedorn freedom liberated gets plays parameter. unstable. thermodynamically favoured configurations trivial gapped angles singlet projection. infty endpoint generic expansions valid hagedorn temperature. trivial exponents analytically pages | non_dup | [] |
42723284 | 10.1007/JHEP10(2017)201 | Logarithmic conformal field theories have a vast range of applications, from
critical percolation to systems with quenched disorder. In this paper we
thoroughly examine the structure of these theories based on their symmetry
properties. Our analysis is model-independent and holds for any spacetime
dimension. Our results include a determination of the general form of
correlation functions and conformal block decompositions, clearing the path for
future bootstrap applications. Several examples are discussed in detail,
including logarithmic generalized free fields, holographic models,
self-avoiding random walks and critical percolation.Comment: 55 pages + appendice | The ABC (in any D) of Logarithmic CFT | the abc (in any d) of logarithmic cft | logarithmic conformal vast percolation quenched disorder. thoroughly examine properties. spacetime dimension. conformal decompositions clearing bootstrap applications. logarithmic holographic avoiding walks pages appendice | non_dup | [] |
84091476 | 10.1007/JHEP10(2017)202 | We study correlation functions in the one-dimensional $\mathcal{N}=2$
supersymmetric SYK model. The leading order 4-point correlation functions are
computed by summing over ladder diagrams expanded in a suitable basis of
conformal eigenfunctions. A novelty of the $\mathcal{N}=2$ model is that both
symmetric and antisymmetric eigenfunctions are required. Although we use a
component formalism, we verify that the operator spectrum and 4-point functions
are consistent with $\mathcal{N}=2$ supersymmetry. We also confirm the
maximally chaotic behavior of this model and comment briefly on its 6-point
functions.Comment: 31 pages, 3 figures, v2: several minor typos correcte | Correlators in the $\mathcal{N}=2$ Supersymmetric SYK Model | correlators in the $\mathcal{n}=2$ supersymmetric syk model | mathcal supersymmetric model. summing ladder diagrams expanded conformal eigenfunctions. novelty mathcal antisymmetric eigenfunctions required. formalism verify mathcal supersymmetry. confirm maximally chaotic comment briefly pages minor typos correcte | non_dup | [] |
93939685 | 10.1007/JHEP10(2017)203 | We consider different sets of AdS$_2$ boundary conditions for the
Jackiw-Teitelboim model in the linear dilaton sector where the dilaton is
allowed to fluctuate to leading order at the boundary of the Poincar\'e disk.
The most general set of boundary condtions is easily motivated in the gauge
theoretic formulation as a Poisson sigma model and has an $\mathfrak{sl}(2)$
current algebra as asymptotic symmetries. Consistency of the variational
principle requires a novel boundary counterterm in the holographically
renormalized action, namely a kinetic term for the dilaton. The on-shell action
can be naturally reformulated as a Schwarzian boundary action. While there can
be at most three canonical boundary charges on an equal-time slice, we consider
all Fourier modes of these charges with respect to the Euclidean boundary time
and study their associated algebras. Besides the (centerless)
$\mathfrak{sl}(2)$ current algebra we find for stricter boundary conditions a
Virasoro algebra, a warped conformal algebra and a $\mathfrak{u}(1)$ current
algebra. In each of these cases we get one half of a corresponding symmetry
algebra in three-dimensional Einstein gravity with negative cosmological
constant and analogous boundary conditions. However, on-shell some of these
algebras reduce to finite-dimensional ones, reminiscent of the on-shell
breaking of conformal invariance in SYK. We conclude with a discussion of
thermodynamical aspects, in particular the entropy and some Cardyology.Comment: 42 pp, 5 figs, v2: added ref | Menagerie of AdS$\boldsymbol{_2}$ boundary conditions | menagerie of ads$\boldsymbol{_2}$ boundary conditions | jackiw teitelboim dilaton dilaton fluctuate poincar disk. condtions motivated theoretic formulation poisson sigma mathfrak asymptotic symmetries. consistency variational counterterm holographically renormalized dilaton. naturally reformulated schwarzian action. canonical charges slice fourier charges euclidean algebras. besides centerless mathfrak stricter virasoro warped conformal mathfrak algebra. einstein cosmological analogous conditions. algebras reminiscent breaking conformal invariance syk. thermodynamical figs | non_dup | [] |
86419067 | 10.1007/JHEP10(2017)204 | Recent discovery of transport anomaly in graphene demonstrated that a system
known to be weakly interacting may become strongly correlated if system
parameter(s) can be tuned such that fermi surface is sufficiently small. We
study the strong correlation effects in the transport coefficients of Dirac
materials doped with magnetic impurity under the magnetic field using
holographic method. The experimental data of magneto-conductivity are well fit
by our theory, however, not much data are available for other transports of
Dirac material in such regime. Therefore, our results on heat
transport,thermo-electric power and Nernst coefficients are left as predictions
of holographic theory for generic Dirac materials in the vicinity of charge
neutral point with possible surface gap. We give detailed look over each
magneto-transport observable and 3Dplots to guide future experiments.Comment: 32 pages, 24 figure | Small Fermi Surfaces and Strong Correlation Effects in Dirac Materials
with Holography | small fermi surfaces and strong correlation effects in dirac materials with holography | discovery anomaly graphene weakly interacting tuned fermi sufficiently small. dirac doped impurity holographic method. magneto conductivity transports dirac regime. thermo nernst holographic generic dirac vicinity neutral gap. look magneto observable dplots guide pages | non_dup | [] |
73960295 | 10.1007/JHEP10(2017)205 | I explore the phenomenology of Supersymmetry models in which the gauginos are
much heavier then that scalar particles of the MSSM. In these models, the
gauginos are inaccessible to colliders while the scalar spectrum is compressed.
I give several examples of models which exhibit this phenomenology built in the
class of General Gauge Mediated Models. I explore possible LSP and NLSP
candidates in these scenarios including Higgsino, stau, and sneutrino
candidates. Collider signatures for these models include multi-particle decay
chains, many taus in the final state, and possible displaced vertices with
semi-long lived sparticles. I enumerate the most likely collider smoking gun
collider signatures for each general LSP/NLSP scenario.Comment: 26 pages, 7 figures, 6 table | Antisplit Supersymmetry | antisplit supersymmetry | explore phenomenology supersymmetry gauginos heavier mssm. gauginos inaccessible colliders compressed. exhibit phenomenology built models. explore nlsp candidates scenarios higgsino stau sneutrino candidates. collider signatures chains taus displaced lived sparticles. enumerate collider smoking collider signatures nlsp pages | non_dup | [] |
78511939 | 10.1007/JHEP10(2017)206 | When starting with a static, spherically-symmetric ansatz, there are two
types of black hole solutions in dRGT massive gravity: (i) exact Schwarzschild
solutions which exhibit no Yukawa suppression at large distances and (ii)
solutions in which the dynamical metric and the reference metric are
simultaneously diagonal and which inevitably exhibit coordinate-invariant
singularities at the horizon. In this work we investigate the possibility of
black hole solutions which can accommodate both a non-singular horizon and
Yukawa asymptotics. In particular, by adopting a time-dependent ansatz, we
derive perturbative analytic solutions which possess non-singular horizons.
These black hole solutions are indistinguishable from Schwarzschild black holes
in the limit of zero graviton mass. At finite graviton mass, they depend
explicitly on time. However, we demonstrate that the location of the apparent
horizon is not necessarily time-dependent, indicating that these black holes
are not necessarily accreting or evaporating (classically). In deriving these
results, we also review and extend known results about static black hole
solutions in massive gravity.Comment: 19 pages, 2 figure | Non-Singular Black Holes in Massive Gravity: Time-Dependent Solutions | non-singular black holes in massive gravity: time-dependent solutions | spherically ansatz drgt massive schwarzschild exhibit yukawa suppression distances simultaneously diagonal inevitably exhibit coordinate singularities horizon. accommodate singular horizon yukawa asymptotics. adopting ansatz derive perturbative analytic possess singular horizons. indistinguishable schwarzschild holes graviton mass. graviton explicitly time. apparent horizon necessarily holes necessarily accreting evaporating classically deriving extend massive pages | non_dup | [] |
86415795 | 10.1007/JHEP10(2017)207 | In supersymmetric theories, the gravitino is abundantly produced in the early
Universe from thermal scattering, resulting in a strong upper bound on the
reheat temperature after inflation. We point out that the gravitino problem may
be absent or very mild due to the early dynamics of a supersymmetry breaking
field, i.e. a sgoldstino. In models of low scale mediation, the field value of
the sgoldstino determines the mediation scale and is in general different in
the early Universe from the present one. A large initial field value since the
era of the inflationary reheating suppresses the gravitino production
significantly. We investigate in detail the cosmological evolution of the
sgoldstino and show that the reheat temperature may be much higher than the
conventional upper bound, restoring the compatibility with thermal
leptogenesis.Comment: 23 pages, 3 figures; v2: discussions added and one figure updated,
matches version published in JHE | Gravitino Production Suppressed by Dynamics of Sgoldstino | gravitino production suppressed by dynamics of sgoldstino | supersymmetric gravitino abundantly universe reheat inflation. gravitino absent mild supersymmetry breaking i.e. sgoldstino. mediation sgoldstino determines mediation universe one. inflationary reheating suppresses gravitino significantly. cosmological sgoldstino reheat restoring compatibility pages discussions updated matches | non_dup | [] |
86419059 | 10.1007/JHEP10(2017)208 | There is significant evidence suggesting that continuous global symmetries
are always gauged in quantum gravity. However, very weakly gauged symmetries
seem global to an effective field theory expansion in powers of Newton's
constant. We show that, at least for Einsteinian quantum gravity on AdS, such
extremely weak gaugings are indeed in the Swampland: Consistency with AdS black
hole thermodynamics requires the bulk gauge coupling $g^2$ not to vanish faster
than $\sim\exp(\ell^{d-1}/G)$, where $\ell$ is the $AdS_{d+1}$ radius and $G$
is Newton's constant as we take the $G\rightarrow0$ limit. This translates to a
constraint in the dual large $N$ CFT, namely, that the two-point function
coefficient of the current $C_J$ cannot grow faster than $\exp(N^2)$ in the
large $N$ limit. We also recover a previously known logarithmic relationship
between the cutoff of the effective field theory in AdS, Planck's mass, and the
AdS radius.Comment: 22 page | Are tiny gauge couplings out of the Swampland? | are tiny gauge couplings out of the swampland? | symmetries gauged gravity. weakly gauged symmetries seem powers newton constant. einsteinian extremely gaugings swampland consistency thermodynamics vanish faster newton rightarrow limit. translates grow faster limit. recover logarithmic cutoff planck | non_dup | [] |
86421826 | 10.1007/JHEP10(2017)209 | A Cachazo-He-Yuan (CHY) type formula is derived for the leading gluon,
bi-adjoint scalar $\phi^3$, Yang-Mills-scalar and non-linear sigma model
$m$-soft factors $S_m$ in arbitrary dimension. The general formula is used to
evaluate explicit examples for up to three soft legs analytically and up to
four soft legs numerically via comparison with amplitude ratios under soft
kinematics. A structural pattern for gluon $m$-soft factor is inferred and a
simpler formula for its calculation is conjectured. In four dimensions, a
Cachazo-Svr\v{c}ek-Witten (CSW) recursive procedure producing the leading
$m$-soft gluon factor in spinor helicity formalism is developed as an
alternative, and Britto-Cachazo-Feng-Witten (BCFW) recursion is used to obtain
the leading four-soft gluon factor for all analytically distinct helicity
configurations.Comment: 27 pages, 1 paragraph change | Leading multi-soft limits from scattering equations | leading multi-soft limits from scattering equations | cachazo yuan gluon adjoint mills sigma dimension. legs analytically legs numerically kinematics. gluon inferred simpler conjectured. cachazo witten recursive producing gluon spinor helicity formalism britto cachazo feng witten bcfw recursion gluon analytically helicity pages paragraph | non_dup | [] |
84332102 | 10.1007/JHEP10(2017)210 | Dark Matter might be an accidentally stable baryon of a new confining gauge
interaction. We extend previous studies exploring the possibility that the DM
is made of dark quarks heavier than the dark confinement scale. The resulting
phenomenology contains new unusual elements: a two-stage DM cosmology
(freeze-out followed by dark condensation), a large DM annihilation cross
section through recombination of dark quarks (allowing to fit the positron
excess). Light dark glue-balls are relatively long lived and give extra
cosmological effects; DM itself can remain radioactive.Comment: New version published in JHE | Dark Matter as a weakly coupled Dark Baryon | dark matter as a weakly coupled dark baryon | accidentally baryon confining interaction. extend exploring quarks heavier confinement scale. phenomenology unusual cosmology freeze condensation annihilation recombination quarks allowing positron excess glue balls lived extra cosmological | non_dup | [] |
86415201 | 10.1007/JHEP10(2017)212 | A multi-parameter integrable deformation of the principal chiral model is
presented. The Yang-Baxter and bi-Yang-Baxter sigma-models, the principal
chiral model plus a Wess-Zumino term and the TsT transformation of the
principal chiral model are all recovered when the appropriate deformation
parameters vanish. When the Lie group is SU(2), we show that this
four-parameter integrable deformation of the SU(2) principal chiral model
corresponds to the Lukyanov model.Comment: 20 pages, published versio | Combining the bi-Yang-Baxter deformation, the Wess-Zumino term and TsT
transformations in one integrable sigma-model | combining the bi-yang-baxter deformation, the wess-zumino term and tst transformations in one integrable sigma-model | integrable deformation principal chiral presented. baxter baxter sigma principal chiral wess zumino principal chiral recovered deformation vanish. integrable deformation principal chiral lukyanov pages versio | non_dup | [] |
84091519 | 10.1007/JHEP10(2017)213 | Hamiltonian Truncation (a.k.a. Truncated Spectrum Approach) is an efficient
numerical technique to solve strongly coupled QFTs in d=2 spacetime dimensions.
Further theoretical developments are needed to increase its accuracy and the
range of applicability. With this goal in mind, here we present a new variant
of Hamiltonian Truncation which exhibits smaller dependence on the UV cutoff
than other existing implementations, and yields more accurate spectra. The key
idea for achieving this consists in integrating out exactly a certain class of
high energy states, which corresponds to performing renormalization at the
cubic order in the interaction strength. We test the new method on the strongly
coupled two-dimensional quartic scalar theory. Our work will also be useful for
the future goal of extending Hamiltonian Truncation to higher dimensions d >=
3.Comment: 8 pages, 4 figures; v2: published versio | High-Precision Calculations in Strongly Coupled Quantum Field Theory
with Next-to-Leading-Order Renormalized Hamiltonian Truncation | high-precision calculations in strongly coupled quantum field theory with next-to-leading-order renormalized hamiltonian truncation | truncation a.k.a. truncated solve qfts spacetime dimensions. developments applicability. goal mind variant truncation exhibits cutoff implementations spectra. achieving integrating performing renormalization cubic strength. quartic theory. goal extending truncation pages versio | non_dup | [] |
93939280 | 10.1007/JHEP10(2017)214 | We continue to study the BPS gauge five-brane solutions of codimension two in
ten-dimensional heterotic supergravity. The geometry including the dilaton and
the NS-NS $B$-field are sourced from the monopole chain in $\mathbb{R}^2 \times
S^1$. We find that the geometry is asymptotically Ricci flat and the dilaton is
no longer imaginary valued. These properties are contrasted with the smeared
counterpart discussed in our previous paper. We perform the T-duality
transformations of the solution and find that it never results in a
non-geometric object.Comment: 24 pages, 4 figures, typos corrected, version published in JHE | Gauge Five-brane Solutions of Co-dimension Two in Heterotic Supergravity | gauge five-brane solutions of co-dimension two in heterotic supergravity | continue brane codimension heterotic supergravity. dilaton sourced monopole mathbb asymptotically ricci dilaton imaginary valued. contrasted smeared counterpart paper. duality transformations never geometric pages typos corrected | non_dup | [] |