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29567092 | 10.1007/JHEP11(2015)118 | We consider a right-handed scalar neutrino as the inflaton which carries a
gravitational coupling with a supersymmetric QCD sector responsible for
breaking supersymmetry dynamically. The framework suggests an inflaton
potential which is a deformed version of the quadratic chaotic inflation
leading to a flatter potential. We find that this deformation results a sizable
tensor to scalar ratio which falls within the allowed region by PLANCK 2015. At
the same time supersymmetry breaking at the end of inflation can naturally be
induced in this set-up. The symmetries required to construct the framework
allows the neutrino masses and mixing to be of right order.Comment: 24 pages, 3 figures; version to appear in JHE | A Dynamic Modification to Sneutrino Chaotic Inflation | a dynamic modification to sneutrino chaotic inflation | handed inflaton carries gravitational supersymmetric breaking supersymmetry dynamically. inflaton deformed quadratic chaotic inflation flatter potential. deformation sizable falls planck supersymmetry breaking inflation naturally symmetries pages | non_dup | [] |
29539809 | 10.1007/JHEP11(2015)119 | We investigate T-duality of a closed string moving in a weakly curved
background of the second order. A previously discussed weakly curved background
consisted of a flat metric and a linearly coordinate dependent Kalb-Ramond
field with an infinitesimal strength. The background here considered differs
from the above in a coordinate dependent metric of the second order.
Consequently, the corresponding Ricci tensor is nonzero. As this background
does not posses the global shift symmetry the generalized Buscher T-dualization
procedure is not applicable to it. We redefine it and make it applicable to
backgrounds without the global symmetry | T-dualization in a curved background in absence of a global symmetry | t-dualization in a curved background in absence of a global symmetry | duality moving weakly curved order. weakly curved consisted linearly coordinate kalb ramond infinitesimal strength. differs coordinate order. ricci nonzero. posses buscher dualization applicable redefine applicable backgrounds | non_dup | [] |
42643503 | 10.1007/JHEP11(2015)122 | We show how to extend systematically the FONLL scheme for inclusion of heavy
quark mass effects in DIS to account for the possible effects of an intrinsic
charm component in the nucleon. We show that when there is no intrinsic charm,
FONLL is equivalent to S-ACOT to any order in perturbation theory, while when
an intrinsic charm component is included FONLL is identical to ACOT, again to
all orders in perturbation theory. We discuss in detail the inclusion of top
and bottom quarks to construct a variable flavour number scheme, and give
explicit expressions for the construction of the structure functions $F^c_2$,
$F^c_L$ and $F^c_3$ to NNLO.Comment: 43 pages, 1 figure. Final JHEP versio | Charm in Deep-Inelastic Scattering | charm in deep-inelastic scattering | extend systematically fonll inclusion intrinsic charm nucleon. intrinsic charm fonll acot perturbation intrinsic charm fonll acot orders perturbation theory. inclusion quarks flavour expressions pages figure. jhep versio | non_dup | [] |
29532489 | 10.1007/JHEP11(2015)123 | We study compactification of 6 dimensional (1,0) theories on T^2. We use
geometric engineering of these theories via F-theory and employ mirror symmetry
technology to solve for the effective 4d N=2 geometry for a large number of the
(1,0) theories including those associated with conformal matter. Using this we
show that for a given 6d theory we can obtain many inequivalent 4d N=2 SCFTs.
Some of these respect the global symmetries of the 6d theory while others
exhibit SL(2,Z) duality symmetry inherited from global diffeomorphisms of the
T^2. This construction also explains the 6d origin of moduli space of 4d affine
ADE quiver theories as flat ADE connections on T^2. Among the resulting 4d N=2
CFTs we find theories whose vacuum geometry is captured by an LG theory (as
opposed to a curve or a local CY geometry). We obtain arbitrary genus curves of
class S with punctures from toroidal compactification of (1,0) SCFTs where the
curve of the class S theory emerges through mirror symmetry. We also show that
toroidal compactification of the little string version of these theories can
lead to class S theories with no punctures on arbitrary genus Riemann surface.Comment: 58 pages, 8 figures, v2: references added, typos fixed, table 2
update | Geometric Engineering, Mirror Symmetry and 6d (1,0) -> 4d, N=2 | geometric engineering, mirror symmetry and 6d (1,0) -> 4d, n=2 | compactification geometric employ mirror solve conformal matter. inequivalent scfts. symmetries exhibit duality inherited diffeomorphisms explains moduli affine quiver connections cfts captured opposed genus punctures toroidal compactification scfts emerges mirror symmetry. toroidal compactification punctures genus riemann pages typos update | non_dup | [] |
29531758 | 10.1007/JHEP11(2015)124 | Searching for Higgs bosons beyond the Standard Model (BSM) is one of the most
important missions for hadron colliders. As a landmark of BSM physics, the MSSM
Higgs sector at the LHC is expected to be tested up to the scale of the
decoupling limit of O(1) TeV, except for a wedge region centered around
$\tan\beta \sim 3 -10$, which has been known to be difficult to probe. In this
article, we present a dedicated study testing the decoupled MSSM Higgs sector,
at the LHC and a next-generation $pp$-collider, proposing to search in channels
with associated Higgs productions, with the neutral and charged Higgs further
decaying into $tt$ and $tb$, respectively. In the case of neutral Higgs we are
able to probe for the so far uncovered wedge region via $pp\to bb H/A \to
bbtt$. Additionally, we cover the the high $\tan\beta$ range with $pp\to bb H/A
\to bb\tau\tau$. The combination of these searches with channels dedicated to
the low $\tan\beta$ region, such as $pp\to H/A \to tt$ and $pp\to tt H/A \to
tttt$ potentially covers the full $\tan\beta$ range. The search for charged
Higgs has a slightly smaller sensitivity for the moderate $\tan\beta$ region,
but additionally probes for the higher and lower $\tan\beta$ regions with even
greater sensitivity, via $pp\to tb H^\pm \to tbtb$. While the LHC will be able
to probe the whole $\tan\beta$ range for Higgs masses of O(1) TeV by combining
these channels, we show that a future 100 TeV $pp$-collider has a potential to
push the sensitivity reach up to $\sim \mathcal O(10)$ TeV. In order to deal
with the novel kinematics of top quarks produced by heavy Higgs decays, the
multivariate Boosted Decision Tree (BDT) method is applied in our collider
analyses. The BDT-based tagging efficiencies of both hadronic and leptonic
top-jets, and their mutual fake rates as well as the faking rates by other jets
($h$, $Z$, $W$, $b$, etc.) are also presented.Comment: published versio | Heavy Higgs Bosons at 14 TeV and 100 TeV | heavy higgs bosons at 14 tev and 100 tev | searching bosons missions hadron colliders. landmark mssm decoupling wedge centered beta probe. dedicated decoupled mssm collider proposing productions neutral decaying respectively. neutral uncovered wedge bbtt additionally cover beta searches dedicated beta tttt potentially covers beta range. moderate beta additionally probes beta tbtb beta combining collider push mathcal tev. deal kinematics quarks decays multivariate boosted collider analyses. tagging efficiencies hadronic leptonic jets mutual fake faking jets etc. versio | non_dup | [] |
42637099 | 10.1007/JHEP11(2015)125 | We present an extensive study of non-minimal flavour violation in the squark
sector in the framework of the Minimal Supersymmetric Standard Model. We
investigate the effects of multiple non-vanishing flavour-violating elements in
the squark mass matrices by means of a Markov Chain Monte Carlo scanning
technique and identify parameter combinations that are favoured by both current
data and theoretical constraints. We then detail the resulting distributions of
the flavour-conserving and flavour-violating model parameters. Based on this
analysis, we propose a set of benchmark scenarios relevant for future studies
of non-minimal flavour violation in the Minimal Supersymmetric Standard Model.Comment: 31 pages, 12 figures, 6 tables; SLHA files for non-minimally
flavour-violating MSSM benchmark scenarios available as ancillary files;
version to appear in JHE | General squark flavour mixing: constraints, phenomenology and benchmarks | general squark flavour mixing: constraints, phenomenology and benchmarks | extensive flavour violation squark supersymmetric model. vanishing flavour violating squark markov monte carlo scanning combinations favoured constraints. flavour conserving flavour violating parameters. propose benchmark scenarios flavour violation supersymmetric pages tables slha files minimally flavour violating mssm benchmark scenarios ancillary files | non_dup | [] |
42637111 | 10.1007/JHEP11(2015)126 | The recently proposed ER=EPR correspondence postulates the existence of
wormholes (Einstein-Rosen bridges) between entangled states (such as EPR
pairs). Entanglement is famously known to be unobservable in quantum mechanics,
in that there exists no observable (or, equivalently, projector) that can
accurately pick out whether a generic state is entangled. Many features of the
geometry of spacetime, however, are observables, so one might worry that the
presence or absence of a wormhole could identify an entangled state in ER=EPR,
violating quantum mechanics, specifically, the property of state-independence
of observables. In this note, we establish that this cannot occur: there is no
measurement in general relativity that unambiguously detects the presence of a
generic wormhole geometry. This statement is the ER=EPR dual of the
undetectability of entanglement.Comment: 14 pages, 4 figure | Wormhole and Entanglement (Non-)Detection in the ER=EPR Correspondence | wormhole and entanglement (non-)detection in the er=epr correspondence | correspondence postulates wormholes einstein rosen bridges entangled entanglement famously unobservable mechanics observable equivalently projector accurately pick generic entangled. spacetime observables worry wormhole entangled violating mechanics independence observables. establish relativity unambiguously detects generic wormhole geometry. statement undetectability pages | non_dup | [] |
29558569 | 10.1007/JHEP11(2015)128 | We consider a generic framework where the Standard Model (SM) coexists with a
hidden sector endowed with some additional gauge symmetry. When this symmetry
is broken by a scalar field charged under the hidden gauge group, the
corresponding scalar boson generally mixes with the SM Higgs boson. In
addition, massive hidden gauge bosons emerge and via the mixing, the observed
Higgs-like mass eigenstate is the only known particle that couples to these
hidden gauge bosons directly.
We study the LHC monojet signatures of this scenario and the corresponding
constraints on the gauge coupling of the hidden gauge group as well as the
mixing of the Higgs scalars.Comment: 18 pages, 4 figure | Higgsophilic gauge bosons and monojets at the LHC | higgsophilic gauge bosons and monojets at the lhc | generic coexists hidden endowed symmetry. broken hidden boson mixes boson. massive hidden bosons emerge eigenstate couples hidden bosons directly. monojet signatures hidden pages | non_dup | [] |
29565193 | 10.1007/JHEP11(2015)129 | Warped conformal field theories (WCFTs) are a novel class of non-relativistic
theories. A simple, yet non-trivial, example of such theory is a massive Weyl
fermion in $(1+1)$-dimensions, which we study in detail. We derive general
properties of the spectrum and modular properties of partition functions of
WCFTs. The periodic (Ramond) sector of this fermionic system is non-trivial,
and we build two novel partition functions for this sector which have no
counterpart in a CFT$_2$. The thermodynamical properties of WCFTs are revisited
in the canonical and micro-canonical ensemble.Comment: 41 page | Warped Weyl fermion partition functions | warped weyl fermion partition functions | warped conformal wcfts relativistic theories. trivial massive weyl fermion detail. derive modular partition wcfts. ramond fermionic trivial build partition counterpart thermodynamical wcfts revisited canonical micro canonical | non_dup | [] |
42643575 | 10.1007/JHEP11(2015)130 | We consider the off-shell formulation of the 5D, $ {\cal N}$=1 super
Yang-Mills and super Chern-Simons theories in harmonic superspace. Using such a
formulation we develop a manifestly supersymmetric and gauge invariant approach
to constructing the one-loop effective action both in super Yang-Mills and
super Chern-Simons models. On the base of this approach we compute the leading
low-energy quantum contribution to the effective action on the Abelian vector
multiplet background. This contribution corresponds to $F^4$ invariant which is
given in 5D superfield form.Comment: 29 pages, minor modification, published versio | Effective actions in ${\cal N}$=1, D5 supersymmetric gauge theories:
harmonic superspace approach | effective actions in ${\cal n}$=1, d5 supersymmetric gauge theories: harmonic superspace approach | formulation super mills super chern simons harmonic superspace. formulation manifestly supersymmetric constructing super mills super chern simons models. abelian multiplet background. superfield pages minor modification versio | non_dup | [] |
29557442 | 10.1007/JHEP11(2015)131 | Double field theory is an approach for massless modes of string theory,
unifying and geometrizing all gauge invariance in manifest $\mathbf{O}(D,D)$
covariant manner. In this approach, we derive off-shell conserved Noether
current and corresponding Noether potential associated with unified gauge
invariance. We add Wald-type counter two-form to the Noether potential and
define conserved global charges as surface integral. We check our
$\mathbf{O}(D,D)$ covariant formula against various string backgrounds, both
geometric and non-geometric. In all cases we examined, we find perfect
agreements with previous results. Our formula facilitates to evaluate momenta
along not only ordinary spacetime directions but also dual spacetime directions
on equal footing. From this, we confirm recent assertion that null wave in
doubled spacetime is the same as macroscopic fundamental string in ordinary
spacetime.Comment: v2) 1+42 pages, Refs added, minor changes. To appear in JHE | $\mathbf{O}(D,D)$ Covariant Noether Currents and Global Charges in
Double Field Theory | $\mathbf{o}(d,d)$ covariant noether currents and global charges in double field theory | massless unifying geometrizing invariance manifest mathbf covariant manner. derive conserved noether noether unified invariance. wald counter noether conserved charges integral. check mathbf covariant backgrounds geometric geometric. perfect agreements results. facilitates momenta ordinary spacetime directions spacetime directions footing. confirm assertion doubled spacetime macroscopic ordinary pages refs minor changes. | non_dup | [] |
29551847 | 10.1007/JHEP11(2015)136 | Multi-loop scattering amplitudes in N=4 Yang-Mills theory possess cluster
algebra structure. In order to develop a computational framework which exploits
this connection, we show how to construct bases of Goncharov polylogarithm
functions, at any weight, whose symbol alphabet consists of cluster coordinates
on the $A_n$ cluster algebra. Using such a basis we present a new expression
for the 2-loop 6-particle NMHV amplitude which makes some of its cluster
structure manifest.Comment: 32 pages; v2: minor corrections and clarification | Hedgehog Bases for A_n Cluster Polylogarithms and An Application to
Six-Point Amplitudes | hedgehog bases for a_n cluster polylogarithms and an application to six-point amplitudes | amplitudes mills possess structure. exploits connection bases goncharov polylogarithm symbol alphabet algebra. nmhv pages minor clarification | non_dup | [] |
29563996 | 10.1007/JHEP11(2015)137 | We explore the phenomenological predictions of a supersymmetric standard
model, with a large extra dimension and unifying gauge couplings. The modified
five dimensional renormalisation group equations make it possible to obtain
light, maximally mixed stops, with a low scale of supersymmetry breaking and a
low unification scale. This allows the fine-tuning to be lowered right down to
the barrier coming directly from experimental lower limits on the stop masses.
We also show that attempts at modifying the SUSY breaking pattern to obtain
more natural soft terms at the high scale do not give the expected fine-tuning
relaxation, and only RGE effects turn out to be effective in generating a lower
fine-tuning | Features of electroweak symmetry breaking in five dimensional SUSY
models | features of electroweak symmetry breaking in five dimensional susy models | explore phenomenological supersymmetric extra unifying couplings. renormalisation maximally stops supersymmetry breaking unification scale. fine tuning lowered barrier coming stop masses. attempts modifying susy breaking fine tuning relaxation generating fine tuning | non_dup | [] |
29564178 | 10.1007/JHEP11(2015)138 | In the framework of the QCD light-cone sum rules (LCSRs) we present the
analysis of all $B, B_{s}\to \eta^{(\prime)}$ and $D, D_{s}\to \eta^{(\prime)}$
form factors ($f^+, f^0$ and $f^T$) by including $m_{\eta^{(\prime)}}^2$
corrections in the leading (up to the twist-four) and next-to-leading order (up
to the twist-three) in QCD, and two-gluon contributions to the form factors at
the leading twist. The SU(3)-flavour breaking corrections and the axial anomaly
contributions to the distribution amplitudes are also consistently taken into
account. The complete results for the $f^0$ and $f^T$ form factors of $B,B_s
\to \eta^{(\prime)}$ and $D, D_{s} \to \eta^{(\prime)}$ relevant for processes
like $B \to \eta^{(\prime)} \tau \nu_{\tau}$ or $B_{s} \to \eta^{(\prime)} l^+
l^-$ are given for the first time, as well as the two-gluon contribution to the
tensor form factors. The values obtained for the $f^+$ form factors are as
follows: $f^+_{B\eta}(0)= 0.168^{+0.042}_{-0.047}$, $|f^+_{B_s\eta}(0)|=
0.212^{+0.015}_{-0.013}$, $f^+_{B\eta^\prime}(0)= 0.130^{+0.036}_{-0.032}$,
$f^+_{B_s\eta^\prime}(0)= 0.252^{+0.023}_{-0.020}$ and $f^+_{D\eta}(0)=
0.429^{+0.165}_{-0.141}$, $|f^+_{D_s\eta}(0)|= 0.495^{+0.030}_{-0.029}$,
$f^+_{D\eta^\prime}(0)= 0.292^{+0.113}_{-0.104}$, $f^+_{D_s\eta^\prime}(0)=
0.558^{+0.047}_{-0.045}$. Also phenomenological predictions for semileptonic
$B, B_{s}\to \eta^{(\prime)}$ and $D, D_{s}\to \eta^{(\prime)}$ decay modes are
given.Comment: 36 pages, 9 figures, accepted for publication in JHE | Form factors of B, Bs -> eta, eta' and D, Ds -> eta, eta' transitions
from QCD light-cone sum rules | form factors of b, bs -> eta, eta' and d, ds -> eta, eta' transitions from qcd light-cone sum rules | cone lcsrs prime prime prime twist twist gluon twist. flavour breaking axial anomaly amplitudes consistently account. prime prime prime prime gluon factors. prime prime prime prime phenomenological semileptonic prime prime pages publication | non_dup | [] |
29556061 | 10.1007/JHEP11(2015)139 | We examine axino dark matter in the regime of a low reheating temperature T_R
after inflation and taking into account that reheating is a non-instantaneous
process. This can have a significant effect on the dark matter abundance,
mainly due to entropy production in inflaton decays. We study both thermal and
non-thermal production of axinos in the context of the MSSM with ten free
parameters. We identify the ranges of the axino mass and the reheating
temperature allowed by the LHC and other particle physics data in different
models of axino interactions. We confront these limits with cosmological
constraints coming the observed dark matter density, large structures formation
and big bang nucleosynthesis. We find a number of differences in the
phenomenologically acceptable values of the axino mass and the reheating
temperature relative to previous studies. In particular, an upper bound on the
axino mass becomes dependent on T_R, reaching a maximum value at T_R~10^2 GeV.
If the lightest ordinary supersymmetric particle is a wino or a higgsino, we
obtain lower a limit of approximately 10 GeV for the reheating temperature. We
demonstrate also that entropy production during reheating affects the maximum
allowed axino mass and lowest values of the reheating temperature.Comment: v2: improved discussion of warm dark matter bounds, results for stau
LOSP adde | Axino dark matter with low reheating temperature | axino dark matter with low reheating temperature | examine axino reheating inflation reheating instantaneous process. abundance inflaton decays. axinos mssm parameters. ranges axino reheating axino interactions. confront cosmological coming bang nucleosynthesis. phenomenologically acceptable axino reheating studies. axino reaching gev. lightest ordinary supersymmetric wino higgsino reheating temperature. reheating affects axino reheating warm bounds stau losp adde | non_dup | [] |
29568914 | 10.1007/JHEP11(2015)140 | The formalism of quantum state space geometry on manifolds of generalised
coherent states is proposed as a natural setting for the construction of
geometric dual descriptions of non-relativistic quantum systems. These state
manifolds are equipped with natural Riemannian and symplectic structures
derived from the Hilbert space inner product. This approach allows for the
systematic construction of geometries which reflect the dynamical symmetries of
the quantum system under consideration. We analyse here in detail the two
dimensional case and demonstrate how existing results in the AdS_2/CFT_1
context can be understood within this framework. We show how the radial/bulk
coordinate emerges as an energy scale associated with a regularisation
procedure and find that, under quite general conditions, these state manifolds
are asymptotically anti-de Sitter solutions of a class of classical dilaton
gravity models. For the model of conformal quantum mechanics proposed by de
Alfaro et. al. the corresponding state manifold is seen to be exactly AdS_2
with a scalar curvature determined by the representation of the symmetry
algebra. It is also shown that the dilaton field itself is given by the quantum
mechanical expectation values of the dynamical symmetry generators and as a
result exhibits dynamics equivalent to that of a conformal mechanical system.Comment: 25 Pages, References Adde | Duality constructions from quantum state manifolds | duality constructions from quantum state manifolds | formalism manifolds generalised coherent geometric descriptions relativistic systems. manifolds equipped riemannian symplectic hilbert product. geometries reflect symmetries consideration. analyse understood framework. coordinate emerges regularisation manifolds asymptotically sitter dilaton models. conformal mechanics alfaro manifold curvature algebra. dilaton expectation generators exhibits conformal pages adde | non_dup | [] |
29563698 | 10.1007/JHEP11(2015)141 | We study some aspects of asymmetric orbifolds of tori, with the orbifold
group being some $\mathbb{Z}_N$ subgroup of the T-duality group and, in
particular, provide a concrete understanding of certain phase factors that may
accompany the T-duality operation on the stringy Hilbert space in toroidal
compactification. We discuss how these T-duality twist phase factors are
related to the symmetry and locality properties of the closed string vertex
operator algebra, and clarify the role that they enact in the modular
covariance of the orbifold theory, mainly using asymmetric orbifolds of tori
which are root lattices as working examples.Comment: 67 pages. v2: references added and typos correcte | T-duality Twists and Asymmetric Orbifolds | t-duality twists and asymmetric orbifolds | asymmetric orbifolds tori orbifold mathbb subgroup duality concrete accompany duality stringy hilbert toroidal compactification. duality twist locality clarify enact modular covariance orbifold asymmetric orbifolds tori lattices pages. typos correcte | non_dup | [] |
42638808 | 10.1007/JHEP11(2015)142 | We propose a novel method to study flavor-changing neutral currents in the
$e^+e^-\to D^{*0}$ and $e^+e^-\to B_{s}^* $ transitions, tuning the energy of
$e^+e^-$- collisions to the mass of the narrow vector resonance $D^{*0}$ or $
B_{s}^*$. We present a thorough study of both short-distance and long-distance
contributions to $e^+e^-\to D^{*0}$ in the Standard Model and investigate
possible contributions of new physics in the charm sector. This process, albeit
very rare, has clear advantages with respect to the $D^0 \to e^+e^-$ decay: the
helicity suppression is absent, and a richer set of effective operators can be
probed. Implications of the same proposal for $B_{s}^*$ are also discussed.Comment: 24 pages, 2 figure | Direct probes of flavor-changing neutral currents in $e^+e^-$ collisions | direct probes of flavor-changing neutral currents in $e^+e^-$ collisions | propose flavor changing neutral currents tuning collisions narrow thorough charm sector. albeit rare advantages helicity suppression absent richer probed. proposal pages | non_dup | [] |
29563985 | 10.1007/JHEP11(2015)143 | We consider baryogenesis in a model which has a CP invariant Lagrangian, CP
invariant initial conditions and does not spontaneously break CP at any of the
minima. We utilize the fact that tunneling processes between CP invariant
minima can break CP to implement baryogenesis. CP invariance requires the
presence of two tunneling processes with opposite CP breaking phases and equal
probability of occurring. In order for the entire visible universe to see the
same CP violating phase, we consider a model where the field doing the
tunneling is the inflaton.Comment: 12 page | Baryogenesis in a CP invariant theory | baryogenesis in a cp invariant theory | baryogenesis lagrangian spontaneously break minima. utilize tunneling minima break implement baryogenesis. invariance tunneling opposite breaking occurring. visible universe violating tunneling | non_dup | [] |
29560092 | 10.1007/JHEP11(2015)145 | We discuss properties of interpolating geometries in three dimensional
gravity in the presence of a chiral anomaly. This anomaly, which introduces an
unbalance between left and right central charges, is protected under RG flows.
For this simple reason it is impossible to gap a system with such an anomaly.
Our goal is to discuss how holography captures this basic and robust feature.
We demonstrate the absence of a mass gap by analysing the linearized spectrum
and holographic entanglement entropy of these backgrounds in the context of
AdS$_3$/CFT$_2$.Comment: 22 pages + Appendices, v2 bibliography fixed + references adde | Fake gaps in AdS_3/CFT_2 | fake gaps in ads_3/cft_2 | interpolating geometries chiral anomaly. anomaly introduces unbalance charges protected flows. impossible anomaly. goal holography captures robust feature. analysing linearized holographic entanglement backgrounds .comment pages appendices bibliography adde | non_dup | [] |
29547868 | 10.1007/JHEP11(2015)146 | We conjecture an embedding operator which assigns, to any 2n+1 hermitian
matrices, a 2n-dimensional hypersurface in flat (2n + 1)-dimensional Euclidean
space. This corresponds to precisely defining a fuzzy D(2n)-brane corresponding
to N D0-branes. Points on the emergent hypersurface correspond to zero
eigenstates of the embedding operator, which have an interpretation as coherent
states underlying the emergent noncommutative geometry. Using this
correspondence, all physical properties of the emergent D(2n)-brane can be
computed. We apply our conjecture to noncommutative flat and spherical spaces.
As a by-product, we obtain a construction of a rotationally symmetric flat
noncommutative space in 4 dimensions.Comment: 14 pages, no figures. v2: added references and a clarificatio | Noncommutative spaces and matrix embeddings on flat R^{2n+1} | noncommutative spaces and matrix embeddings on flat r^{2n+1} | conjecture embedding assigns hermitian hypersurface euclidean space. precisely defining fuzzy brane branes. emergent hypersurface eigenstates embedding coherent emergent noncommutative geometry. correspondence emergent brane computed. conjecture noncommutative spherical spaces. rotationally noncommutative pages figures. clarificatio | non_dup | [] |
29556211 | 10.1007/JHEP11(2015)148 | A few years ago, it had been shown that effects stemming from renormalisation
group running can be quite large in the scotogenic model, where neutrinos
obtain their mass only via a 1-loop diagram (or, more generally, in many models
in which the light neutrino mass is generated via quantum corrections at
loop-level). We present a new computation of the renormalisation group
equations (RGEs) for the scotogenic model, thereby updating previous results.
We discuss the matching in detail, in particular in what regards the different
mass spectra possible for the new particles involved. We furthermore develop
approximate analytical solutions to the RGEs for an extensive list of
illustrative cases, covering all general tendencies that can appear in the
model. Comparing them with fully numerical solutions, we give a comprehensive
discussion of the running in the scotogenic model. Our approach is mainly
top-down, but we also discuss an attempt to get information on the values of
the fundamental parameters when inputting the low-energy measured quantities in
a bottom-up manner. This work serves the basis for a full parameter scan of the
model, thereby relating its low- and high-energy phenomenology, to fully
exploit the available information.Comment: 44 pages, 13 figures; continuation of 1205.0008 [hep-ph]; content
matches published version; v3 corrected a minor typo in Eq. (25 | Running of Radiative Neutrino Masses: The Scotogenic Model - REVISITED | running of radiative neutrino masses: the scotogenic model - revisited | stemming renormalisation running scotogenic neutrinos renormalisation rges scotogenic thereby updating results. matching regards involved. approximate rges extensive illustrative covering tendencies model. comprehensive running scotogenic model. attempt inputting quantities manner. serves scan thereby relating phenomenology exploit pages continuation matches corrected minor typo | non_dup | [] |
29563183 | 10.1007/JHEP11(2015)149 | Clarifying the locality properties of higher-spin gravity is a pressing task,
but notoriously difficult due to the absence of a weakly-coupled flat regime.
The simplest non-trivial case where this question can be addressed is the
quartic self-interaction of the AdS scalar field present in the higher-spin
multiplet. We investigate this issue in the context of the holographic duality
between the minimal bosonic higher-spin theory on AdS$_4$ and the free
$O\left(N\right)$ vector model in three dimensions. In particular, we determine
the exact explicit form of the derivative expansion of the bulk scalar quartic
vertex. The quartic vertex is obtained from the field theory four-point
function of the operator dual to the bulk scalar, by making use of our previous
results for the Witten diagrams of higher-spin exchanges. This is facilitated
by establishing the conformal block expansions of both the boundary four-point
function and the dual bulk Witten diagram amplitudes. We show that the vertex
we find satisfies a generalised notion of locality.Comment: 40 pages plus appendices, 8 figure | Quartic AdS Interactions in Higher-Spin Gravity from Conformal Field
Theory | quartic ads interactions in higher-spin gravity from conformal field theory | clarifying locality pressing notoriously weakly regime. simplest trivial addressed quartic multiplet. holographic duality bosonic dimensions. quartic vertex. quartic witten diagrams exchanges. facilitated establishing conformal expansions witten amplitudes. satisfies generalised notion pages appendices | non_dup | [] |
42642264 | 10.1007/JHEP11(2015)151 | Mandelbrot set is a closure of the set of zeroes of $resultant_x(F_n,F_m)$
for iterated maps $F_n(x)=f^{\circ n}(x)-x$ in the moduli space of maps $f(x)$.
The wonderful fact is that for a given $n$ all zeroes are not chaotically
scattered around the moduli space, but lie on smooth curves, with just a few
cusps, located at zeroes of $discriminant_x(F_n)$. We call this phenomenon the
Mandelbrot property. If approached by the cabling method, symmetrically-colored
HOMFLY polynomials $H^{\cal K}_n(A|q)$ can be considered as linear forms on the
$n$-th "power" of the knot ${\cal K}$, and one can wonder if zeroes of
$resultant_{q^2}(H_n,H_m)$ can also possess the Mandelbrot property. We present
and discuss such resultant-zeroes patterns in the complex-$A$ plane. Though $A$
is hardly an adequate parameter to describe the moduli space of knots, the
Mandelbrot-like structure is clearly seen -- in full accord with the vision of
arXiv:hep-th/0501235, that concrete slicing of the Universal Mandelbrot set is
not essential for revealing its structure.Comment: 16 page | Colored HOMFLY and Generalized Mandelbrot set | colored homfly and generalized mandelbrot set | mandelbrot closure zeroes resultant iterated circ moduli wonderful zeroes chaotically scattered moduli cusps zeroes discriminant call phenomenon mandelbrot property. approached cabling symmetrically colored homfly polynomials knot wonder zeroes resultant possess mandelbrot property. resultant zeroes plane. hardly adequate moduli knots mandelbrot accord vision concrete slicing universal mandelbrot revealing | non_dup | [] |
29563204 | 10.1007/JHEP11(2015)154 | We calculate the two-loop correction to the dispersion relation for
worldsheet modes of the BMN string in AdS(n) x S(n) x T(10-2n) for n=2,3,5. For
the massive modes the result agrees with the exact dispersion relation derived
from symmetry considerations with no correction to the interpolating function
h. For the massless modes in AdS(3) x S(3) x T(4) however our result does not
match what one expects from the corresponding symmetry based analysis. We also
derive the S-matrix for massless modes up to the one-loop order. The scattering
phase is given by the massless limit of the Hernandez-Lopez phase. In addition
we compute a certain massless S-matrix element at two loops and show that it
vanishes suggesting that the two-loop phase in the massless sector is zero.Comment: 30 pages, 6 figures; v2: References and comment on type IIB added,
acknowledgements updated; v3: Comparison to proposed exact massless S-matrix
in sec 5.3 corrected. Only non-trivial phase appears at one loop. Additional
minor clarification | The AdS(n) x S(n) x T(10-2n) BMN string at two loops | the ads(n) x s(n) x t(10-2n) bmn string at two loops | worldsheet massive agrees considerations interpolating massless match expects analysis. derive massless order. massless hernandez lopez phase. massless loops vanishes massless pages comment acknowledgements updated massless corrected. trivial loop. minor clarification | non_dup | [] |
29550158 | 10.1007/JHEP11(2015)155 | We study N=1 theories on Hermitian manifolds of the form M^4=S^1xM^3 with M^3
a U(1) fibration over S^2, and their 3d N=2 reductions. These manifolds admit
an Heegaard-like decomposition in solid tori D^2xT^2 and D^2xS^1. We prove that
when the 4d and 3d anomalies are cancelled the matrix integrands in the Coulomb
branch partition functions can be factorised in terms of 1-loop factors on
D^2xT^2 and D^2xS^1 respectively. By evaluating the Coulomb branch matrix
integrals we show that the 4d and 3d partition functions can be expressed as
sums of products of 4d and 3d holomorphic blocks.Comment: 57 page | Factorisation and holomorphic blocks in 4d | factorisation and holomorphic blocks in 4d | hermitian manifolds fibration reductions. manifolds admit heegaard decomposition tori anomalies cancelled integrands coulomb branch partition factorised respectively. evaluating coulomb branch integrals partition sums holomorphic | non_dup | [] |
29559360 | 10.1007/JHEP11(2015)156 | By compactifying gauge theories on a lower dimensional manifold, we often
find many interesting relationships between a geometry and a supersymmetric
quantum field theory. In this paper we consider conformal field theories
obtained from twisted compactification on a Riemann surface with a boundary.
Various kinds of supersymmetric boundary conditions are exchanged under
S-duality. To consider these transformations one need to take into account
boundary degrees of freedom. So we study how the degrees of freedom can be
added at the boundary of the Riemann surface. In this paper I show that this
introduction of the boundary fields can be done preserving supersymmetry by
means of 2-dimensional superfields.Comment: 14 pages, some typos corrected and introduction is rewritten, the
title and abstract were change | Construction of 4d SYM compactified on open Riemann surfaces by the
superfield formalism | construction of 4d sym compactified on open riemann surfaces by the superfield formalism | compactifying manifold supersymmetric theory. conformal twisted compactification riemann boundary. kinds supersymmetric exchanged duality. transformations freedom. freedom riemann surface. preserving supersymmetry pages typos corrected rewritten title | non_dup | [] |
29560202 | 10.1007/JHEP11(2015)157 | In this paper, we study massive gravity in the presence of Born-Infeld
nonlinear electrodynamics. First, we obtain metric function related to this
gravity and investigate the geometry of the solutions and find that there is an
essential singularity at the origin ($r=0$). It will be shown that due to
contribution of the massive part, the number, types and places of horizons may
be changed. Next, we calculate the conserved and thermodynamic quantities and
check the validation of the first law of thermodynamics. We also investigate
thermal stability of these black holes in context of canonical ensemble. It
will be shown that number, type and place of phase transition points are
functions of different parameters which lead to dependency of stability
conditions to these parameters. Also, it will be shown how the behavior of
temperature is modified due to extension of massive gravity and strong
nonlinearity parameter. Next, critical behavior of the system in extended phase
space by considering cosmological constant as pressure is investigated. A study
regarding neutral Einstein-massive gravity in context of extended phase space
is done. Geometrical approach is employed to study the thermodynamical behavior
of the system in context of heat capacity and extended phase space. It will be
shown that GTs, heat capacity and extended phase space have consistent results.
Finally, critical behavior of the system is investigated through use of another
method. It will be pointed out that the results of this method is in agreement
with other methods and follow the concepts of ordinary thermodynamics.Comment: 19 pages with 17 figures, Sections V, VI, VII, VIII with related
figures and discussions are added. arXiv admin note: text overlap with
arXiv:1507.0656 | Einstein-Born-Infeld-Massive Gravity: adS-Black Hole Solutions and their
Thermodynamical properties | einstein-born-infeld-massive gravity: ads-black hole solutions and their thermodynamical properties | massive born infeld electrodynamics. singularity massive places horizons changed. conserved thermodynamic quantities check validation thermodynamics. holes canonical ensemble. dependency parameters. massive nonlinearity parameter. cosmological investigated. neutral einstein massive done. geometrical thermodynamical space. results. method. pointed concepts ordinary pages viii discussions added. admin overlap | non_dup | [] |
29537996 | 10.1007/JHEP11(2015)158 | The presence of extra scalar singlets is a feature of several motivated
extensions of the Standard Model, and the mixing of such a singlet with the
Higgs boson is allowed to be quite large by current experiments. In this paper
we perform a thorough phenomenological study of this possibility. We consider
both direct and indirect searches, and we quantify the current constraints as
well as the prospects for future hadron and lepton machines - from the
forthcoming LHC run up to a futuristic 100 TeV proton-proton collider. The
direct reaches are obtained extrapolating the current limits with a technique
that we discuss and check with various tests. We find a strong complementarity
between direct and indirect searches, with the former dominating for lower
values of the singlet mass. We also find that the trilinear Higgs coupling can
have sizeable deviations from its Standard Model value, a fact for which we
provide an analytical understanding. The results are first presented in a
general scalar singlet extension of the Standard Model, taking advantage of the
very small number of parameters relevant for the phenomenology. Finally, we
specify the same analysis to a few most natural models, i.e. the
Next-to-Minimal Supersymmetric Standard Model, Twin Higgs and Composite Higgs.Comment: 30 pages, 12 figures, 2 tables. v2: discussion extended in sections 2
and 5, references added, matches version published in JHE | Singlet-like Higgs bosons at present and future colliders | singlet-like higgs bosons at present and future colliders | extra singlets motivated extensions singlet boson experiments. thorough phenomenological possibility. indirect searches quantify prospects hadron lepton machines forthcoming futuristic proton proton collider. reaches extrapolating check tests. complementarity indirect searches former dominating singlet mass. trilinear sizeable deviations understanding. singlet advantage phenomenology. specify i.e. supersymmetric twin composite pages tables. matches | non_dup | [] |
29566023 | 10.1007/JHEP11(2015)159 | We investigate QCD-like theory with exact center symmetry, with emphasis on
the finite-temperature phase transition concerning center and chiral
symmetries. On the lattice, we formulate center symmetric $SU(3)$ gauge theory
with three fundamental Wilson quarks by twisting quark boundary conditions in a
compact direction ($Z_3$-QCD model). We calculate the expectation value of
Polyakov loop and the chiral condensate as a function of temperature on 16^3 x
4 and 20^3 x 4 lattices along the line of constant physics realizing
$m_{PS}/m_{V}=0.70$. We find out the first-order center phase transition, where
the hysteresis of the magnitude of Polyakov loop exists depending on
thermalization processes. We show that chiral condensate decreases around the
critical temperature in a similar way to that of the standard three-flavor QCD,
as it has the hysteresis in the same range as that of Polyakov loop. We also
show that the flavor symmetry breaking due to the twisted boundary condition
gets qualitatively manifest in the high-temperature phase. These results are
consistent with the predictions based on the chiral effective model in the
literature. Our approach could provide novel insights to the nonperturbative
connection between the center and chiral properties.Comment: 25 pages, 6 figures, to apper in JHE | Lattice study on QCD-like theory with exact center symmetry | lattice study on qcd-like theory with exact center symmetry | emphasis concerning chiral symmetries. formulate wilson quarks twisting expectation polyakov chiral condensate lattices realizing hysteresis polyakov thermalization processes. chiral condensate flavor hysteresis polyakov loop. flavor breaking twisted gets qualitatively manifest phase. chiral literature. insights nonperturbative connection chiral pages apper | non_dup | [] |
29568282 | 10.1007/JHEP11(2015)160 | We elaborate on the Green's functions that appeared in [1,2] when
generalizing, from massless to massive particles, various equivalences between
soft theorems and Ward identities of large gauge symmetries. We analyze these
Green's functions in considerable detail and show that they form a hierarchy of
functions which describe `boundary to bulk' propagators for large $U(1)$ gauge
parameters, supertranslations and sphere vector fields respectively. As a
consistency check we verify that the Green's functions associated to the large
diffeomorphisms map the Poincare group at null infinity to the Poincare group
at time-like infinity.Comment: 16 page | Null to time-like infinity Green's functions for asymptotic symmetries
in Minkowski spacetime | null to time-like infinity green's functions for asymptotic symmetries in minkowski spacetime | elaborate appeared generalizing massless massive equivalences theorems ward identities symmetries. analyze considerable hierarchy propagators supertranslations sphere respectively. consistency check verify diffeomorphisms poincare infinity poincare | non_dup | [] |
29560088 | 10.1007/JHEP11(2015)162 | We present a symplectic rearrangement of the effective four-dimensional
non-geometric scalar potential resulting from type IIB superstring
compactification on Calabi Yau orientifolds. The strategy has two main steps.
In the first step, we rewrite the four dimensional scalar potential utilizing
some interesting flux combinations which we call new generalized flux orbits.
After invoking a couple of non-trivial symplectic relations, in the second
step, we further rearrange all the pieces of scalar potential into a completely
`symplectic-formulation' which involves only the symplectic ingredients (such
as period matrix etc.) without the need of knowing Calabi Yau metric. Moreover,
the scalar potential under consideration is induced by a generic tree level
K\"{a}hler potential and (non-geometric) flux superpotential for arbitrary
numbers of complex structure moduli, K\"ahler moduli and odd-axions. Finally,
we exemplify our symplectic formulation for the two well known toroidal
examples based on type IIB superstring compactification on ${\mathbb
T}^6/{({\mathbb Z}_2 \times {\mathbb Z}_2)}$-orientifold and ${\mathbb
T}^6/{{\mathbb Z}_4}$-orientifold.Comment: version 3: 43 pages, some improvements, to appear in JHE | A symplectic rearrangement of the four dimensional non-geometric scalar
potential | a symplectic rearrangement of the four dimensional non-geometric scalar potential | symplectic rearrangement geometric superstring compactification calabi orientifolds. steps. rewrite utilizing combinations call orbits. invoking couple trivial symplectic rearrange pieces symplectic formulation involves symplectic ingredients etc. knowing calabi metric. consideration generic hler geometric superpotential moduli ahler moduli axions. exemplify symplectic formulation toroidal superstring compactification mathbb mathbb mathbb orientifold mathbb mathbb pages improvements | non_dup | [] |
29549475 | 10.1007/JHEP11(2015)163 | We discuss reductions of general N=1 four dimensional gauge theories on S^2.
The effective two dimensional theory one obtains depends on the details of the
coupling of the theory to background fields, which can be translated to a
choice of R-symmetry. We argue that, for special choices of R-symmetry, the
resulting two dimensional theory has a natural interpretation as an N=(0,2)
gauge theory. As an application of our general observations, we discuss
reductions of N=1 and N=2 dualities and argue that they imply certain two
dimensional dualities | On the reduction of 4d N=1 theories on S^2 | on the reduction of 4d n=1 theories on s^2 | reductions obtains translated symmetry. argue choices theory. reductions dualities argue imply dualities | non_dup | [] |
29548003 | 10.1007/JHEP11(2015)164 | The target-space interpretation of the exact (in $\alpha'$) reflection
coefficient for scattering from Euclidean black-hole horizons in classical
string theory is studied. For concreteness, we focus on the solvable $SL(2,
\mathbb{R})_k/U(1)$ black hole. It is shown that it exhibits a fascinating
UV/IR mixing, dramatically modifying the late-time behavior of general
relativity. We speculate that this might play an important role in the
black-hole information puzzle, as well as in clarifying features related with
the non-locality of Little String Theory | Stringy Horizons and UV/IR Mixing | stringy horizons and uv/ir mixing | alpha reflection euclidean horizons studied. concreteness solvable mathbb hole. exhibits fascinating dramatically modifying relativity. speculate puzzle clarifying locality | non_dup | [] |
29558568 | 10.1007/JHEP11(2015)166 | The decays $K^+\to\pi^+\nu\bar\nu$ and $K_L\to\pi^0\nu\bar\nu$, being the
theoretically cleanest rare decays of mesons, are very sensitive probes of New
Physics. In view of the excellent prospects of reaching the Standard Model
sensitivity for $K^+\to\pi^+\nu\bar\nu$ by the NA62 experiment at CERN and for
$K_L\to\pi^0\nu\bar\nu$ by the KOTO experiment at J-PARC, we study them in the
simplest extensions of the SM in which stringent correlations between these two
decays and other flavour observables are present. We first consider simple
models with tree-level Z and Z' contributions in which either MFV or a $U(2)^3$
symmetry is imposed on the quark flavour-violating couplings. We then compare
the resulting correlations with those present in generic models in which the
latter couplings are arbitrary, subject to constraints from $\Delta F=2$
processes, electroweak and collider data. Of particular interest are the
correlations with $\epsilon'/\epsilon$ and $K_L\to\mu^+\mu^-$ which limit the
size of NP contributions to $K^+\to\pi^+\nu\bar\nu$ and
$K_L\to\pi^0\nu\bar\nu$, depending on the Dirac structure of couplings and the
relevant operators. But in MFV also the constraint from $B_s\to\mu^+\mu^-$
turns out to be important. We take into account the recent results from lattice
QCD and large N approach that indicate $\epsilon'/\epsilon$ in the SM to be
significantly below the data. While in many models the enhancement of
$\epsilon'/\epsilon$ implies a suppression of $K_L\to\pi^0\nu\bar\nu$, we
present two models in which these observables can be simultaneously enhanced
relative to SM predictions. A correlation between $K^+\to\pi^+\nu\bar\nu$ and
$B\to K(K^*)\mu^+\mu^-$, found by us in the simple models considered here,
should be of interest for NA62 and LHCb experimentalists at CERN in the coming
years. The one with $B\to K(K^*)\nu\bar\nu$ will be tested at Belle II.Comment: 32 pages, 6 figures, 1 table. v2: updated analysis in section 4,
matches version published in JHE | $K\to\pi\nu\bar\nu$ and $\epsilon'/\epsilon$ in Simplified New Physics
Models | $k\to\pi\nu\bar\nu$ and $\epsilon'/\epsilon$ in simplified new physics models | decays theoretically cleanest rare decays mesons probes physics. excellent prospects reaching cern koto parc simplest extensions stringent decays flavour observables present. imposed flavour violating couplings. generic couplings delta electroweak collider data. epsilon epsilon dirac couplings operators. turns important. epsilon epsilon data. enhancement epsilon epsilon suppression observables simultaneously predictions. lhcb experimentalists cern coming years. belle pages table. updated matches | non_dup | [] |
29548956 | 10.1007/JHEP11(2015)167 | It is well-known that there is a geometric correspondence between
high-frequency quasi-normal modes (QNMs) and null geodesics (spherical photon
orbits). In this paper, we generalize such correspondence to charged scalar
field in Kerr-Newman space-time. In our case, the particle and black hole are
all charged, so one should consider non-geodesic orbits. Using the WKB
approximation, we find that the real part of quasi-normal frequency corresponds
to the orbits frequency, the imaginary part of the frequency corresponds to the
Lyapunov exponent of these orbits and the eigenvalue of angular equation
corresponds to carter constant. From the properties of the imaginary part of
quasi-normal frequency of charged massless scalar field, we can still find that
the QNMs of charged massless scalar field possess the zero damping modes in
extreme Kerr-Newman spacetime under certain condition which has been fixed in
this paper.Comment: 30 pages, many figures, to appear in JHE | The Quasi-normal Modes of Charged Scalar Fields in Kerr-Newman black
hole and Its Geometric Interpretation | the quasi-normal modes of charged scalar fields in kerr-newman black hole and its geometric interpretation | geometric correspondence quasi qnms geodesics spherical orbits generalize correspondence kerr newman time. geodesic orbits. quasi orbits imaginary lyapunov exponent orbits eigenvalue carter constant. imaginary quasi massless qnms massless possess damping extreme kerr newman spacetime pages | non_dup | [] |
29567874 | 10.1007/JHEP11(2015)168 | Recently an orthogonal basis of $\mathcal{W}_N$-algebra (AFLT basis) labeled
by $N$-tuple Young diagrams was found in the context of 4D/2D duality.
Recursion relations among the basis are summarized in the form of an algebra
SH$^c$ which is universal for any $N$. We show that it has an $\mathfrak{S}_3$
automorphism which is referred to as triality. We study the level-rank duality
between minimal models, which is a special example of the automorphism. It is
shown that the nonvanishing states in both systems are described by $N$ or $M$
Young diagrams with the rows of boxes appropriately shuffled. The reshuffling
of rows implies there exists partial ordering of the set which labels them. For
the simplest example, one can compute the partition functions for the partially
ordered set (poset) explicitly, which reproduces the Rogers-Ramanujan
identities. We also study the description of minimal models by SH$^c$. Simple
analysis reproduces some known properties of minimal models, the structure of
singular vectors and the $N$-Burge condition in the Hilbert space.Comment: 1+38 pages and 12 figures. v2: typos corrected + comments adde | SH$^c$ Realization of Minimal Model CFT: Triality, Poset and Burge
Condition | sh$^c$ realization of minimal model cft: triality, poset and burge condition | orthogonal mathcal aflt labeled tuple diagrams duality. recursion summarized universal mathfrak automorphism referred triality. duality automorphism. nonvanishing diagrams rows boxes appropriately shuffled. reshuffling rows ordering labels them. simplest partition partially ordered poset explicitly reproduces rogers ramanujan identities. reproduces singular burge hilbert pages figures. typos corrected comments adde | non_dup | [] |
29541725 | 10.1007/JHEP11(2015)170 | We describe a one-parameter family of new holographic RG flows that start
from $AdS_4 \times S^7$ and go to $\widehat{AdS_5} \times {\cal B}_6$, where
${\cal B}_6$ is conformal to a K\"ahler manifold and $\widehat{AdS_5}$ is
Poincar\'e $AdS_5$ with one spatial direction compactified and fibered over
${\cal B}_6$. The new solutions "flow up dimensions," going from the
$(2+1)$-dimensional conformal field theory on M2 branes in the UV to a
$(3+1)$-dimensional field theory on intersecting M5 branes in the infra-red.
The M2 branes completely polarize into M5 branes along the flow and the
Poincar\'e sections of the $\widehat{AdS_5}$ are the $(3+1)$-dimensional common
intersection of the M5 branes. The emergence of the extra dimension in the
infra-red suggests a new strongly-coupled phase of the M2 brane and ABJM
theories in which charged solitons are becoming massless. The flow solution is
first analyzed by finding a four-dimensional $N \! = \! 2$ supersymmetric flow
in $N \! = \! 8$ gauged supergravity. This is then generalized to a one
parameter family of non-supersymmetric flows. The infra-red limit of the
solutions appears to be quite singular in four dimensions but the uplift to
eleven-dimensional supergravity is remarkable and regular (up to orbifolding).
Our construction is a non-trivial application of the recently derived uplift
formulae for fluxes, going well beyond the earlier constructions of stationary
points solutions. The eleven-dimensional supersymmetry is also analyzed and
shows how, for the supersymmetric flow, the M2-brane supersymmetry in the UV is
polarized entirely into M5-brane supersymmetry in the infra-red.Comment: 28 pages, 2 figures. Version 2 contains a discussion of new
non-supersymmetric flow | Flowing to Higher Dimensions: A New Strongly-Coupled Phase on M2 Branes | flowing to higher dimensions: a new strongly-coupled phase on m2 branes | holographic flows widehat conformal ahler manifold widehat poincar compactified fibered going conformal branes intersecting branes infra red. branes polarize branes poincar widehat intersection branes. emergence extra infra brane abjm solitons becoming massless. supersymmetric gauged supergravity. supersymmetric flows. infra singular uplift eleven supergravity remarkable orbifolding trivial uplift formulae fluxes going constructions stationary solutions. eleven supersymmetry supersymmetric brane supersymmetry polarized entirely brane supersymmetry infra pages figures. supersymmetric | non_dup | [] |
29568123 | 10.1007/JHEP11(2015)173 | We address the recent anomalies in semi-leptonic $B$-meson decays using a
model of fermion masses based on the $U(2)$ flavor symmetry. The new
contributions to $b \to s \ell \ell$ transitions arise due to a tree-level
exchange of a $Z^\prime$ vector boson gauging a $U(1)$ subgroup of the flavor
symmetry. They are controlled by a single parameter and are approximately
aligned to the Standard Model prediction, with constructive interference in the
$e$-channel and destructive interference in the $\mu$-channel. The current
experimental data on semi-leptonic $B$-meson decays can be very well reproduced
without violating existing constraints from flavor violation in the quark and
lepton sectors. Our model will be tested by new measurements of $b \to s \ell
\ell$ transitions and also by future electroweak precision tests, direct
$Z^\prime$ searches, and $\mu$-$e$ conversion in nuclei.Comment: 23 pages, 2 figures, references added, matches published versio | Lepton Flavor Non-Universality in B-meson Decays from a U(2) Flavor
Model | lepton flavor non-universality in b-meson decays from a u(2) flavor model | anomalies leptonic meson decays fermion flavor symmetry. arise prime boson gauging subgroup flavor symmetry. aligned constructive interference destructive interference channel. leptonic meson decays reproduced violating flavor violation lepton sectors. electroweak precision prime searches conversion pages matches versio | non_dup | [] |
29553960 | 10.1007/JHEP11(2015)175 | We show that compatibility of supersymmetry with exact semi-classics demands
that in calculating multi-instanton amplitudes, the "separation" quasi-zeromode
must be complexified and the integration cycles must be found by using complex
gradient flow (or Picard-Lefschetz equations.) As a non-trivial application, we
study $\mathcal N=2$ extended supersymmetric quantum mechanics. Even though in
this case supersymmetry is unbroken, the instanton-anti-instanton amplitude
(naively calculated) seems to contribute to the ground state energy. We show,
however, that the instanton-anti-instanton event consists of two parts: a
fermion-correlated and a scalar-correlated event. Although both of these
contributions are naively of the same sign and the latter is superficially
higher order in the perturbative coupling, we show that the two contributions
exactly cancel when they are evaluated on Lefschetz thimbles due to their
relative Hidden Topological Angles (HTAs). This gives strong evidence that the
semi-classical expansion using Lefschetz thimbles is not only a meaningful
prescription for higher order semi-classics, but a necessary one. This
deduction seems to be universal and applicable to both supersymmetric and
non-supersymmetric theories. In conclusion we speculate that similar
conspiracies are responsible for the non-formation of certain molecular
contributions in theories where instantons have more than two fermionic
zeromodes and do not contribute to the superpotential.Comment: 18 pages, 2 figures. Some extensions and minor corrections were
implemented. This version was accepted for publication at JHE | The curious incident of multi-instantons and the necessity of Lefschetz
thimbles | the curious incident of multi-instantons and the necessity of lefschetz thimbles | compatibility supersymmetry classics demands calculating instanton amplitudes quasi zeromode complexified cycles picard lefschetz equations. trivial mathcal supersymmetric mechanics. supersymmetry unbroken instanton instanton naively energy. instanton instanton fermion event. naively superficially perturbative cancel lefschetz thimbles hidden topological angles htas lefschetz thimbles meaningful prescription classics one. deduction universal applicable supersymmetric supersymmetric theories. speculate conspiracies instantons fermionic zeromodes pages figures. extensions minor implemented. publication | non_dup | [] |
42638827 | 10.1007/JHEP11(2015)176 | Horndeski gravities are theories of gravity coupled to a scalar field, in
which the action contains an additional non-minimal quadratic coupling of the
scalar, through its first derivative, to the Einstein tensor or the analogous
higher-derivative tensors coming from the variation of Gauss-Bonnet or Lovelock
terms. In this paper we study the thermodynamics of the static black hole
solutions in $n$ dimensions, in the simplest case of a Horndeski coupling to
the Einstein tensor. We apply the Wald formalism to calculate the entropy of
the black holes, and show that there is an additional contribution over and
above those that come from the standard Wald entropy formula. The extra
contribution can be attributed to unusual features in the behaviour of the
scalar field. We also show that a conventional regularisation to calculate the
Euclidean action leads to an expression for the entropy that disagrees with the
Wald results. This seems likely to be due to ambiguities in the subtraction
procedure. We also calculate the viscosity in the dual CFT, and show that the
viscosity/entropy ratio can violate the $\eta/S\ge 1/(4\pi)$ bound for
appropriate choices of the parameters.Comment: 30 pages, no figure, minor revision | Black Hole Entropy and Viscosity Bound in Horndeski Gravity | black hole entropy and viscosity bound in horndeski gravity | horndeski gravities quadratic einstein analogous tensors coming gauss bonnet lovelock terms. thermodynamics simplest horndeski einstein tensor. wald formalism holes come wald formula. extra attributed unusual field. regularisation euclidean disagrees wald results. ambiguities subtraction procedure. viscosity viscosity violate choices pages minor revision | non_dup | [] |
29555530 | 10.1007/JHEP11(2015)177 | The frequency dependence of the AC conductivity is studied in a holographic
model of a non-fermi liquid that is amenable to both analytical and numerical
computation. In the regime that dissipation dominates the DC conductivity, the
AC conductivity is described well in the IR by a Drude peak despite the absence
of quasiparticles. In the regime where pair-production-like processes dominate
the conductivity there is no Drude peak. A scaling tail is found for the AC
conductivity that is independent of the charge density and momentum
dissipation. Evidence is given that this scaling tail $\sigma_{AC}\sim
\omega^m$ appears generically in quantum critical holographic systems and the
associated scaling exponent $m$ is calculated in terms of the Lifshitz and
conduction critical exponents.Comment: 66 pages, 14 figures and 2 table | Scaling of the Holographic AC conductivity for non-Fermi liquids at
criticality | scaling of the holographic ac conductivity for non-fermi liquids at criticality | conductivity holographic fermi amenable computation. dissipation dominates conductivity conductivity drude quasiparticles. dominate conductivity drude peak. tail conductivity dissipation. tail sigma omega generically holographic exponent lifshitz conduction pages | non_dup | [] |
29566222 | 10.1007/JHEP11(2015)178 | We initiate the perturbative study of the S-matrix for the excitations on top
of the GKP vacuum at strong coupling. Using the string sigma model action
expanded around the null cusp classical solution, we compute the tree-level
S-matrix elements and compare them with the predictions from the asymptotic
Bethe Ansatz. We also check the factorization of the three-body S-matrix for
various bosonic processes, finding precise agreement with the constraints
imposed by integrability.Comment: 33 pages, 13 figure | Worldsheet scattering for the GKP string | worldsheet scattering for the gkp string | initiate perturbative excitations coupling. sigma expanded cusp asymptotic bethe ansatz. check factorization bosonic precise imposed pages | non_dup | [] |
29567729 | 10.1007/JHEP11(2015)179 | Models of 4D $\mathcal{N}=1$ supergravity coupled to chiral multiplets with
vanishing or positive scalar potential have been denoted as no-scale. Of
particular interest in the context of string theory are models which
additionally possess a shift-symmetry. In this case there exists a dual
description of chiral models in terms of real linear multiplets. We classify
all ungauged shift-symmetric no-scale supergravities in both formulations and
verify that they match upon dualization. Additionally, we comment on the
realizations within effective supergravities descending from string
compactifications.Comment: 31 pages; v2: References adde | Classification of Shift-Symmetric No-Scale Supergravities | classification of shift-symmetric no-scale supergravities | mathcal supergravity chiral multiplets vanishing denoted scale. additionally possess symmetry. chiral multiplets. classify ungauged supergravities formulations verify match dualization. additionally comment realizations supergravities descending pages adde | non_dup | [] |
33092579 | 10.1007/JHEP11(2015)180 | We derive a torsionfull version of three-dimensional N=2 Newton-Cartan supergravity using a non-relativistic notion of the superconformal tensor calculus. The “superconformal” theory that we start with is Schrödinger supergravity which we obtain by gauging the Schrödinger superalgebra. We present two non-relativistic N=2 matter multiplets that can be used as compensators in the superconformal calculus. They lead to two different off-shell formulations which, in analogy with the relativistic case, we call “old minimal” and “new minimal” Newton-Cartan supergravity. We find similarities but also point out some differences with respect to the relativistic case | Newton-Cartan supergravity with torsion and Schrödinger supergravity | newton-cartan supergravity with torsion and schrödinger supergravity | derive torsionfull newton cartan supergravity relativistic notion superconformal calculus. “superconformal” schrödinger supergravity gauging schrödinger superalgebra. relativistic multiplets compensators superconformal calculus. formulations analogy relativistic call “old minimal” “new minimal” newton cartan supergravity. similarities relativistic | non_dup | [] |
42641361 | 10.1007/JHEP11(2015)181 | AdS black holes with hyperbolic horizons provide strong-coupling descriptions
of thermal CFT states on hyperboloids. The low-temperature limit of these
systems is peculiar. In this note we show that, in addition to a large ground
state degeneracy, these states also have an anomalously large holographic
complexity, scaling logarithmically with the temperature. We speculate on
whether this fact generalizes to other systems whose extreme infrared regime is
formally controlled by Conformal Quantum Mechanics, such as various instances
of near-extremal charged black holes.Comment: Reference added. 14 pages, 3 figure | Holographic Complexity Of Cold Hyperbolic Black Holes | holographic complexity of cold hyperbolic black holes | holes hyperbolic horizons descriptions hyperboloids. peculiar. degeneracy anomalously holographic logarithmically temperature. speculate generalizes extreme infrared formally conformal mechanics instances extremal added. pages | non_dup | [] |
29549773 | 10.1007/JHEP11(2015)183 | We link the FDR treatment of ultraviolet (UV) divergences to dimensional
regularization up to two loops in QCD. This allows us to derive the one-loop
and two-loop coupling constant and quark mass shifts necessary to translate
infrared finite quantities computed in FDR to the MSbar renormalization scheme.
As a by-product of our analysis, we solve a problem analogous to the breakdown
of unitarity in the Four Dimensional Helicity (FDH) method beyond one loop. A
fix to FDH is then presented that preserves the renormalizability properties of
QCD without introducing evanescent quantities.Comment: 25 pages, 6 figure | Two-loop off-shell QCD amplitudes in FDR | two-loop off-shell qcd amplitudes in fdr | ultraviolet divergences regularization loops qcd. derive shifts translate infrared quantities msbar renormalization scheme. solve analogous breakdown unitarity helicity loop. preserves renormalizability introducing evanescent pages | non_dup | [] |
29570468 | 10.1007/JHEP11(2015)184 | Working within a five-dimensional consistent truncation of type IIB
supergravity dimensionally reduced on $T^{1,1}$, we consider supersymmetry
breaking solutions with the asymptotics of the supersymmetric
Klebanov-Strassler background. There exists a two-parameter family of such
solutions. Within this family, we show that those (and only those) solutions
related to antiD-branes at the tip of the conifold correspond to dual field
theory vacua where a goldstino mode is present and supercurrent Ward identities
hold. Our findings do not depend on the IR singularity of the dual backgrounds,
nor on its resolution. As such, they constitute an independent, necessary check
for the existence of supersymmetry breaking vacua in the conifold cascading
gauge theory. Our analysis relies on a holographic derivation of the Ward
identities which has a wider applicability, beyond the specific system and
symmetries considered here.Comment: 33+1 pages; v2: Slight rephrasing of the abstract, typos corrected
and a reference added; v3: More minor typos corrected, footnote 18 added,
version published in JHE | A goldstino at the bottom of the cascade | a goldstino at the bottom of the cascade | truncation supergravity dimensionally supersymmetry breaking asymptotics supersymmetric klebanov strassler background. solutions. antid branes conifold vacua goldstino supercurrent ward identities hold. singularity backgrounds resolution. constitute check supersymmetry breaking vacua conifold cascading theory. relies holographic derivation ward identities wider applicability symmetries pages slight rephrasing typos corrected minor typos corrected footnote | non_dup | [] |
29551529 | 10.1007/JHEP11(2015)185 | If large extra dimensions exist, the Planck scale may be as low as a TeV and
microscopic black holes may be produced in high-energy particle collisions at
this energy scale. We simulate microscopic black hole formation at the Large
Hadron Collider and compare the simulation results with recent experimental
data by the Compact Muon Solenoid collaboration. The absence of observed black
hole events in the experimental data allows us to set lower bounds on the
Planck scale and various parameters related to microscopic black hole formation
for a number ($3-6$) of extra dimensions. Our analysis sets lower bounds on the
fundamental Planck scale ranging from 0.6 TeV to 4.8 TeV for black holes fully
decaying into Standard Model particles and 0.3 TeV to 2.8 TeV for black holes
settling down to a remnant, depending on the minimum allowed black hole mass at
formation. Formation of black holes with mass less than 5.2 TeV to 6.5 TeV (SM
decay) and 2.2 TeV to 3.4 TeV (remnant) is excluded at 95\% C.L. Our analysis
shows consistency with and difference from the CMS results.Comment: 15 pages, 5 figure | Bounds on large extra dimensions from the simulation of black hole
events at the LHC | bounds on large extra dimensions from the simulation of black hole events at the lhc | extra planck microscopic holes collisions scale. simulate microscopic hadron collider muon solenoid collaboration. bounds planck microscopic extra dimensions. bounds planck ranging holes decaying holes settling remnant formation. holes remnant excluded c.l. consistency pages | non_dup | [] |
29541135 | 10.1007/JHEP11(2015)186 | We discuss consequences of assuming ($i$) that the (Majorana) neutrino mass
matrix $M_\nu$ displays flavour antisymmetry, $S_\nu^T M_\nu S_\nu=-M_\nu$ with
respect to some discrete symmetry $S_\nu$ contained in $SU(3)$ and ($ii$)
$S_\nu$ together with a symmetry $T_l$ of the Hermitian combination
$M_lM_l^\dagger$ of the charged lepton mass matrix forms a finite discrete
subgroup $G_f$ of $SU(3)$ whose breaking generates these symmetries. Assumption
($i$) leads to at least one massless neutrino and allows only four textures for
the neutrino mass matrix in a basis with a diagonal $S_\nu$ if it is assumed
that the other two neutrinos are massive. Two of these textures contain a
degenerate pair of neutrinos.Assumption ($ii$) can be used to determine the
neutrino mixing patterns. We work out these patterns for two major group series
$\Delta(3 N^2)$ and $\Delta(6 N^2)$ as $G_f$. It is found that all $\Delta(6
N^2)$ and $\Delta(3 N^2)$ groups with even $N$ contain some elements which can
provide appropriate $S_\nu$. Mixing patterns can be determined analytically for
these groups and it is found that only one of the four allowed neutrino mass
textures is consistent with the observed values of the mixing angles
$\theta_{13}$ and $\theta_{23}$. This texture corresponds to one massless and a
degenerate pair of neutrinos which can provide the solar pair in the presence
of some perturbations. The well-known groups $A_4$ and $S_4$ provide examples
of the groups in respective series allowing correct $\theta_{13}$ and
$\theta_{23}$. An explicit example based on $A_4$ and displaying a massless and
two quasi degenerate neutrinos is discussed.Comment: 22 pages, 1 figur | Neutrino masses and mixing from flavour antisymmetry | neutrino masses and mixing from flavour antisymmetry | consequences majorana displays flavour antisymmetry hermitian dagger lepton subgroup breaking generates symmetries. massless textures diagonal neutrinos massive. textures degenerate neutrinos.assumption patterns. delta delta delta delta analytically textures angles theta theta texture massless degenerate neutrinos perturbations. respective allowing theta theta displaying massless quasi degenerate neutrinos pages figur | non_dup | [] |
29558147 | 10.1007/JHEP11(2015)187 | We show that the classical S-matrix calculated from the recently proposed
superstring field theories give the correct perturbative S-matrix. In the proof
we exploit the fact that the vertices are obtained by a field redefinition in
the large Hilbert space. The result extends to include the NS-NS subsector of
type II superstring field theory and the recently found equations of motions
for the Ramond fields. In addition, our proof implies that the S-matrix
obtained from Berkovits' WZW-like string field theory then agrees with the
perturbative S-matrix to all orders.Comment: 19 pages, 2 figure | The S-Matrix of superstring field theory | the s-matrix of superstring field theory | superstring perturbative matrix. exploit redefinition hilbert space. extends subsector superstring motions ramond fields. berkovits agrees perturbative pages | non_dup | [] |
29543965 | 10.1007/JHEP11(2015)188 | We study an extension of the Standard Model featuring a hidden sector that
consists of a new scalar charged under a new SU$(N)_D$ gauge group, singlet
under all Standard Model gauge interactions, and coupled with the Standard
Model only via a Higgs portal. We assume that the theory is classically
conformal, with electroweak symmetry breaking dynamically induced via the
Coleman-Weinberg mechanism operating in the hidden sector. Due to the symmetry
breaking pattern, the SU$(N)_D$ gauge group is completely Higgsed and the
resulting massive vectors of the hidden sector constitute a stable dark matter
candidate. We perform a thorough scan over the parameter space of the model at
different values of $N=2$, $3$, and $4$, and investigate the phenomenological
constraints. We find that $N=2,3$ provide the most appealing model setting in
light of present data from colliders and dark matter direct search experiments.
We expect a heavy Higgs to be discovered at LHC by the end of Run II or the
$N=3$ model to be ruled out.Comment: 17 pages, 4 figures (8 plots); typos corrected, previous results do
not change; new section with new figure added before conclusions, few
sentences added to abstract and conclusions; two citations adde | A minimal model for ${\rm SU}(N)$ vector dark matter | a minimal model for ${\rm su}(n)$ vector dark matter | featuring hidden singlet portal. classically conformal electroweak breaking dynamically coleman weinberg operating hidden sector. breaking higgsed massive hidden constitute candidate. thorough scan phenomenological constraints. appealing colliders experiments. discovered ruled pages plots typos corrected sentences citations adde | non_dup | [] |
29558170 | 10.1007/JHEP11(2015)191 | The ATLAS collaboration has recently reported a 2.6 sigma excess in the
search for a heavy resonance decaying into a pair of weak gauge bosons. Only
fully hadronic final states are being looked for in the analysis. If the
observed excess really originates from the gauge bosons' decays, other decay
modes of the gauge bosons would inevitably leave a trace on other exotic
searches. In this paper, we propose the use of the Z boson decay into a pair of
neutrinos to test the excess. This decay leads to a very large missing energy
and can be probed with conventional dark matter searches at the LHC. We discuss
the current constraints from the dark matter searches and the prospects. We
find that optimizing these searches may give a very robust probe of the
resonance, even with the currently available data of the 8 TeV LHC.Comment: 10 pages, 2 figures; v2: added references, fixed typos; v3: added
some clarifications and figures showing MET distributions, published versio | Testing ATLAS Diboson Excess with Dark Matter Searches at LHC | testing atlas diboson excess with dark matter searches at lhc | atlas sigma excess decaying bosons. hadronic looked analysis. excess really originates bosons decays bosons inevitably leave trace exotic searches. propose boson neutrinos excess. missing probed searches lhc. searches prospects. optimizing searches robust pages typos clarifications versio | non_dup | [] |
29564223 | 10.1007/JHEP11(2015)192 | We give a complete analysis of indirect determinations of the top quark mass
in the Standard Model by introducing a systematic procedure to identify
observables that receive quantum corrections enhanced by powers of $M_t$. We
propose to use flavour physics as a tool to extract the top quark mass.
Although present data give only a poor determination, we show how future
theoretical and experimental progress in flavour physics can lead to an
accuracy in $M_t$ well below 2 GeV. We revisit determinations of $M_t$ from
electroweak data, showing how an improved measurement of the $W$ mass leads to
an accuracy well below 1 GeV.Comment: 31 pages, 6 figures. v2: final version to appear on JHE | Indirect determinations of the top quark mass | indirect determinations of the top quark mass | indirect determinations introducing observables receive powers propose flavour extract mass. progress flavour gev. revisit determinations electroweak pages figures. | non_dup | [] |
29567803 | 10.1007/JHEP11(2015)193 | We study quantum gravity with the Einstein-Hilbert action including the
cosmological constant on the Euclidean Einstein universe $S^1\times S^3$. We
compute exactly the spectra and the heat kernels of the relevant operators on
$S^3$ and use these results to compute the heat trace of the graviton and ghost
operators and the exact one-loop effective action on $S^1\times S^3$. We show
that the system is unstable in the infrared limit due to the presence of the
negative modes of the graviton and the ghost operators. We study the thermal
properties of the model with the temperature $T=(2\pi a_1)^{-1}$ determined by
the radius $a_1$ of the circle $S^1$. We show that the heat capacity $C_v$ is
well defined and behaves like $\sim T^3$ in the high temperature limit and has
a singularity of the type $\sim (T-T_c)^{-1}$, indicating a second-order phase
transition, with the critical temperature $T_c$ determined by the cosmological
constant $\Lambda$ and the radius $a$ of the sphere $S^3$. We also discuss some
peculiar properties of the model such as the negative heat capacity as well as
possible physical applications.Comment: 50 pages, 2 figures; misprints in eqs. (5.114), (5.115), (5.181),
(5.186), (5.187) corrected; final results not affecte | One-Loop quantum gravity in the Einstein universe | one-loop quantum gravity in the einstein universe | einstein hilbert cosmological euclidean einstein universe kernels trace graviton ghost unstable infrared graviton ghost operators. circle behaves singularity cosmological lambda sphere peculiar pages misprints eqs. corrected affecte | non_dup | [] |
29565893 | 10.1007/JHEP11(2015)194 | In this paper we discuss the effect of the complete leading-order QED
corrections to the DGLAP equations in the perturbative evolution of parton
distribution functions (PDFs). This requires the extension of the purely QCD
DGLAP evolution, including a PDF for the photons and, consistently, also for
the charged leptons $e^{\pm}$, $\mu^\pm$ and $\tau^\pm$. We present the
implementation of the QED-corrected DGLAP evolution in the presence of photon
and lepton PDFs in the APFEL program and, by means of different assumptions for
the initial scale PDFs, we produce for the first time PDF sets containing
charged lepton distributions. We also present phenomenological studies that aim
to assess the impact of the presence of lepton PDFs in the proton for some
relevant SM (and BSM) processes at the LHC at 13 TeV and the FCC-hh at 100 TeV.
The impact of the photon PDF is also outlined for those processes.Comment: 32 pages, 19 figures, matches published version in JHE | On the Impact of Lepton PDFs | on the impact of lepton pdfs | dglap perturbative parton pdfs purely dglap photons consistently leptons corrected dglap lepton pdfs apfel assumptions pdfs lepton distributions. phenomenological lepton pdfs proton tev. outlined pages matches | non_dup | [] |
29566918 | 10.1007/JHEP11(2015)195 | We continue an examination of the microstate geometries program begun in
arXiv:1409.6017, focussing on the role of branes that wrap the cycles which
degenerate when a throat in the geometry deepens and a horizon forms. An
associated quiver quantum mechanical model of minimally wrapped branes exhibits
a non-negligible fraction of the gravitational entropy, which scales correctly
as a function of the charges. The results suggest a picture of AdS_3/CFT_2
duality wherein the long string that accounts for BTZ black hole entropy in the
CFT description, can also be seen to inhabit the horizon of BPS black holes on
the gravity side.Comment: 50 pages, 4 figures. v2: minor corrections, reference adde | Hair-brane Ideas on the Horizon | hair-brane ideas on the horizon | continue examination microstate geometries begun focussing branes wrap cycles degenerate throat deepens horizon forms. quiver minimally wrapped branes exhibits negligible gravitational correctly charges. picture duality wherein accounts inhabit horizon holes pages figures. minor adde | non_dup | [] |
29562179 | 10.1007/JHEP11(2015)196 | We use a systematic effective field theory setup to derive the $b\bar{b}H$
production cross section. Our result combines the merits of both fixed 4-flavor
and 5-flavor schemes. It contains the full 4-flavor result, including the exact
dependence on the $b$-quark mass, and improves it with a resummation of
collinear logarithms of $m_b/m_H$. In the massless limit, it corresponds to a
reorganized 5-flavor result. While we focus on $b\bar{b}H$ production, our
method applies to generic heavy-quark initiated processes at hadron colliders.
Our setup resembles the variable flavor number schemes known from heavy-flavor
production in deep-inelastic scattering, but also differs in some key aspects.
Most importantly, the effective $b$-quark PDF appears as part of the
perturbative expansion of the final result where it effectively counts as an
$O(\alpha_s)$ object. The transition between the fixed-order (4-flavor) and
resummation (5-flavor) regimes is governed by the low matching scale at which
the $b$-quark is integrated out. Varying this scale provides a systematic way
to assess the perturbative uncertainties associated with the resummation and
matching procedure and reduces by going to higher orders. We discuss the
practical implementation and present numerical results for the $b\bar{b}H$
production cross section at NLO+NLL. We also provide a comparison to the
corresponding predictions in the fixed 4-flavor and 5-flavor results and the
Santander matching prescription. Compared to the latter, we find a slightly
reduced uncertainty and a larger central value, with its central value lying at
the lower edge of our uncertainty band.Comment: 54 pages, 16 figures. Final version to be published in JHEP (one ref
added | Resummation and Matching of $b$-quark Mass Effects in $b\bar{b}H$
Production | resummation and matching of $b$-quark mass effects in $b\bar{b}h$ production | setup derive section. combines merits flavor flavor schemes. flavor improves resummation collinear logarithms massless reorganized flavor result. applies generic initiated hadron colliders. setup resembles flavor schemes flavor inelastic differs aspects. importantly perturbative effectively counts alpha object. flavor resummation flavor regimes governed matching out. perturbative resummation matching reduces going orders. practical nll. flavor flavor santander matching prescription. lying pages figures. jhep | non_dup | [] |
29525841 | 10.1007/JHEP11(2015)197 | We use the techniques of supersymmetric localization to compute the BPS black
hole entropy in N=2 supergravity. We focus on the n_v+1 vector multiplets on
the black hole near horizon background which is AdS_2 x S^2 space. We find the
localizing saddle point of the vector multiplets by solving the localization
equations, and compute the exact one loop partition function on the saddle
point. Furthermore, we propose the appropriate functional integration measure.
Through this measure, the one loop determinant is written in terms of the
radius of the physical metric, which depends on the localizing saddle point
value of the vector multiplets. The result for the one loop determinant is
consistent with the logarithmic corrections to the BPS black hole entropy from
vector multiplets.Comment: 28+16 pages, improved discussion on the boundary mode in the 4.2 and
conclusion sectio | Supersymmetric Localization for BPS Black Hole Entropy: 1-loop Partition
Function from Vector Multiplets | supersymmetric localization for bps black hole entropy: 1-loop partition function from vector multiplets | supersymmetric localization supergravity. multiplets horizon space. localizing saddle multiplets solving localization partition saddle point. propose measure. determinant localizing saddle multiplets. determinant logarithmic pages sectio | non_dup | [] |
29504300 | 10.1007/JHEP11(2015)200 | We show that in 2d CFTs at large central charge, the coupling of the stress
tensor to heavy operators can be re-absorbed by placing the CFT in a
non-trivial background metric. This leads to a more precise computation of the
Virasoro conformal blocks between heavy and light operators, which are shown to
be equivalent to global conformal blocks evaluated in the new background. We
also generalize to the case where the operators carry U(1) charges. The refined
Virasoro blocks can be used as the seed for a new Virasoro block recursion
relation expanded in the heavy-light limit. We comment on the implications of
our results for the universality of black hole thermality in $AdS_3$, or
equivalently, the eigenstate thermalization hypothesis for $CFT_2$ at large
central charge.Comment: 27+7 pages, 3 figures; typos corrected, citations adde | Virasoro Conformal Blocks and Thermality from Classical Background
Fields | virasoro conformal blocks and thermality from classical background fields | cfts absorbed placing trivial metric. precise virasoro conformal blocks conformal blocks background. generalize carry charges. refined virasoro blocks seed virasoro recursion expanded limit. comment universality thermality equivalently eigenstate thermalization pages typos corrected citations adde | non_dup | [] |
29552180 | 10.1007/JHEP11(2015)201 | We present a phenomenological theory of scalar particles that transform as a
sextet and an octet of QCD interactions. These particles may arise as light
bound states of a fundamental dynamics giving rise to a composite Higgs boson
and partial compositeness for the top. As a concrete example, we discuss an
explicit UV completion based on the SU(4)/Sp(4) coset, where QCD colour is
carried by additional fundamental fermions charged under the confining gauge
group. Top partners, as well as potentially even lighter coloured scalars,
arise as bound states of the coloured fermions. We study production and
detection at LHC Run I and II of the octet and sextet, setting lower limits on
masses and couplings to Standard Model particles using existing 8 TeV analyses.
We finally explore prospects for the ongoing 13 TeV Run II: we focus on final
states with two same sign leptons, that have the potential to discriminate the
sextet.Comment: 39 pages, 9 figures, 4 tables. Agrees with version published in JHEP.
Changes w.r.t. v1: Fig. 1 added for illustration, U(1) charge in Tab. 1
corrected, references adde | Composite scalars at the LHC: the Higgs, the Sextet and the Octet | composite scalars at the lhc: the higgs, the sextet and the octet | phenomenological transform sextet octet interactions. arise giving composite boson compositeness top. concrete completion coset colour fermions confining group. partners potentially lighter coloured scalars arise coloured fermions. octet sextet couplings analyses. explore prospects ongoing leptons discriminate pages tables. agrees jhep. w.r.t. fig. illustration tab. corrected adde | non_dup | [] |
29556242 | 10.1007/JHEP11(2015)202 | We present a new analysis of the ratio epsilon'/epsilon within the Standard
Model (SM) using a formalism that is manifestly independent of the values of
leading (V-A)x(V-A) QCD penguin, and EW penguin hadronic matrix elements of the
operators Q_4, Q_9, and Q_10, and applies to the SM as well as extensions with
the same operator structure. It is valid under the assumption that the SM
exactly describes the data on CP-conserving K -> pi pi amplitudes. As a result
of this and the high precision now available for CKM and quark mass parameters,
to high accuracy epsilon'/epsilon depends only on two non-perturbative
parameters, B_6^(1/2) and B_8^(3/2), and perturbatively calculable Wilson
coefficients. Within the SM, we are separately able to determine the hadronic
matrix element <Q_4>_0 from CP-conserving data, significantly more precisely
than presently possible with lattice QCD. Employing B_6^(1/2) = 0.57+-0.19 and
B_8^(3/2) = 0.76+-0.05, extracted from recent results by the RBC-UKQCD
collaboration, we obtain epsilon'/epsilon = (1.9+-4.5) 10^-4, substantially
more precise than the recent RBC-UKQCD prediction and 2.9 sigma below the
experimental value (16.6+-2.3) 10^-4, with the error being fully dominated by
that on B_6^(1/2). Even discarding lattice input completely, but employing the
recently obtained bound B_6^(1/2) <= B_8^(3/2) <= 1 from the large-N approach,
the SM value is found more than 2 sigma below the experimental value. At
B_6^(1/2) = B_8^(3/2) = 1, varying all other parameters within one sigma, we
find epsilon'/epsilon = (8.6+-3.2) 10^-4. We present a detailed anatomy of the
various SM uncertainties, including all sub-leading hadronic matrix elements,
briefly commenting on the possibility of underestimated SM contributions as
well as on the impact of our results on new physics models.Comment: 32 pages, 2 figures, systematic uncertainty for lattice B_6^(1/2)
included, treatment of isospin breaking improved; some remarks added, version
to appear in JHE | Improved anatomy of epsilon'/epsilon in the Standard Model | improved anatomy of epsilon'/epsilon in the standard model | epsilon epsilon formalism manifestly penguin penguin hadronic applies extensions structure. valid describes conserving amplitudes. precision epsilon epsilon perturbative perturbatively calculable wilson coefficients. separately hadronic conserving precisely presently qcd. employing ukqcd epsilon epsilon substantially precise ukqcd sigma dominated discarding employing sigma value. sigma epsilon epsilon anatomy hadronic briefly commenting underestimated pages isospin breaking remarks | non_dup | [] |
29565459 | 10.1007/JHEP11(2015)203 | We find new type II backgrounds with non-relativistic symmetries via
non-Abelian T-duality. First we consider geometries with Galilean symmetries in
type IIA, which have been identified as non-relativistic generalizations of the
ABJM background and massive IIA supergravities. We then consider the
non-Abelian T-duality transformation on the backgrounds with Lifshitz symmetry
constructed by Donos and Gauntlett. Using gauge/gravity duality we study
aspects of the field theory dual to these backgrounds.Comment: 43 pages, 4 figures; typos and one eq. corrected, references adde | Non-Abelian T-duality for nonrelativistic holographic duals | non-abelian t-duality for nonrelativistic holographic duals | backgrounds relativistic symmetries abelian duality. geometries galilean symmetries relativistic generalizations abjm massive supergravities. abelian duality backgrounds lifshitz donos gauntlett. duality pages typos corrected adde | non_dup | [] |
29562188 | 10.1007/JHEP11(2015)207 | We investigate stability of the Higgs effective potential in curved
spacetime. To this end, we consider the gauge-less top-Higgs sector with an
additional scalar field. Explicit form of the terms proportional to the squares
of the Ricci scalar, the Ricci tensor and the Riemann tensor that arise at the
one-loop level in the effective action has been determined. We have
investigated the influence of these terms on the stability of the scalar
effective potential. The result depends on background geometry. In general, the
potential becomes modified both in the region of the electroweak minimum and in
the region of large field strength.Comment: 32 pages, 13 figures; version accepted for publication in JHE | Stability of the effective potential of the gauge-less top-Higgs model
in curved spacetime | stability of the effective potential of the gauge-less top-higgs model in curved spacetime | curved spacetime. field. squares ricci ricci riemann arise determined. potential. geometry. electroweak pages publication | non_dup | [] |
29568674 | 10.1007/JHEP11(2015)208 | We study neutrinoless double beta decay in left-right symmetric extension of
the standard model with type I and type II seesaw origin of neutrino masses.
Due to the enhanced gauge symmetry as well as extended scalar sector, there are
several new physics sources of neutrinoless double beta decay in this model.
Ignoring the left-right gauge boson mixing and heavy-light neutrino mixing, we
first compute the contributions to neutrinoless double beta decay for type I
and type II dominant seesaw separately and compare with the standard light
neutrino contributions. We then repeat the exercise by considering the presence
of both type I and type II seesaw, having non-negligible contributions to light
neutrino masses and show the difference in results from individual seesaw
cases. Assuming the new gauge bosons and scalars to be around a TeV, we
constrain different parameters of the model including both heavy and light
neutrino masses from the requirement of keeping the new physics contribution to
neutrinoless double beta decay amplitude below the upper limit set by the GERDA
experiment and also satisfying bounds from lepton flavor violation, cosmology
and colliders.Comment: v2: 30 pages, 14 figures, Accepted for publication in JHE | Neutrinoless Double Beta Decay in Type I+II Seesaw Models | neutrinoless double beta decay in type i+ii seesaw models | neutrinoless beta seesaw masses. neutrinoless beta model. ignoring boson neutrinoless beta seesaw separately contributions. repeat exercise seesaw negligible seesaw cases. bosons scalars constrain requirement keeping neutrinoless beta gerda satisfying bounds lepton flavor violation cosmology pages publication | non_dup | [] |
29548128 | 10.1007/JHEP11(2015)209 | We compute the hadronic production of top-antitop pairs in association with a
Higgs boson at next-to-leading-order QCD, including the decay of the top and
antitop quark into bottom quarks and leptons. Our computation is based on full
leading and next-to-leading-order matrix elements for $e^+ \nu_e
\mu^-\bar{\nu}_\mu b \bar{b} H(j)$ and includes all non-resonant contributions,
off-shell effects and interferences. Numerical results for the integrated cross
section and several differential distributions are given for the LHC operating
at 13 TeV using a fixed and a dynamical factorization and renormalization
scale. The use of the dynamical instead of the fixed scale improves the
perturbative stability in high-energy tails of most distributions, while the
integrated cross section is hardly affected differing by only about one per
cent and leading to the same K factor of 1.17.Comment: 18 pages, 1 table, 30 figures, version to appear in JHEP, numerical
analysis somewhat extende | NLO QCD corrections to off-shell top-antitop production with leptonic
decays in association with a Higgs boson at the LHC | nlo qcd corrections to off-shell top-antitop production with leptonic decays in association with a higgs boson at the lhc | hadronic antitop boson antitop quarks leptons. resonant interferences. operating factorization renormalization scale. improves perturbative tails hardly differing cent pages jhep somewhat extende | non_dup | [] |
29558555 | 10.1007/JHEP11(2015)210 | The Witten index counts the difference in the number of bosonic and fermionic
states of a quantum mechanical system. The Schur index, which can be defined
for theories with at least $\mathcal{N}=2$ supersymmetry in four dimensions is
a particular refinement of the index, dependent on one parameter $q$ serving as
the fugacity for a particular set of charges which commute with the hamiltonian
and some supersymmetry generators. This index has a known expression for all
Lagrangian and some non-Lagrangian theories as a finite dimensional integral or
a complicated infinite sum. In the case of $\mathcal{N}=4$ SYM with gauge group
$U(N)$ we rewrite this as the partition function of a gas of $N$ non
interacting and translationally invariant fermions on a circle. This allows us
to perform the integrals and write down explicit expressions for fixed $N$ as
well as the exact all orders large $N$ expansion.Comment: 11 pages; v2: typos correcte | The exact Schur index of $\mathcal{N}=4$ SYM | the exact schur index of $\mathcal{n}=4$ sym | witten counts bosonic fermionic system. schur mathcal supersymmetry refinement serving fugacity charges commute supersymmetry generators. lagrangian lagrangian complicated infinite sum. mathcal rewrite partition interacting translationally fermions circle. integrals expressions orders pages typos correcte | non_dup | [] |
29562263 | 10.1007/JHEP11(2015)211 | A direct search for lepton-flavour-violating (LFV) $H\to\mu\tau$ decays of
the recently discovered Higgs boson with the ATLAS detector at the LHC is
presented. The analysis is performed in the $H\to\mu\tau_{\mathrm{had}}$
channel, where $\tau_{\mathrm{had}}$ is a hadronically decaying $\tau$-lepton.
The search is based on the data sample of proton--proton collisions collected
by the ATLAS experiment corresponding to an integrated luminosity of 20.3
fb$^{-1}$ at a centre-of-mass energy of $\sqrt{s}=8$ TeV. No statistically
significant excess of data over the predicted background is observed. The
observed (expected) 95% confidence-level upper limit on the branching fraction,
Br($H\to\mu\tau$), is 1.85% (1.24%).Comment: Comments: 15 pages plus author list + cover pages (31 pages total), 3
figures, 3 tables, submitted to JHEP. All figures including auxiliary figures
are available at
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-08 | Search for lepton-flavour-violating $H\to\mu\tau$ decays of the Higgs
boson with the ATLAS detector | search for lepton-flavour-violating $h\to\mu\tau$ decays of the higgs boson with the atlas detector | lepton flavour violating decays discovered boson atlas presented. mathrm mathrm hadronically decaying lepton. proton proton collisions atlas luminosity sqrt tev. statistically excess observed. confidence branching .comment comments pages cover pages pages tables submitted jhep. auxiliary | non_dup | [] |
29571160 | 10.1007/JHEP11(2015)212 | We use non-Abelian T-duality to construct new N=1 solutions of type IIA
supergravity (and their M-theory lifts) that interpolate between AdS_5
geometries. We initiate a study of the holographic interpretation of these
backgrounds as RG flows between conformal fixed points. Along the way we give
an elegant formulation of non-Abelian T-duality when acting on a wide class of
backgrounds, including those corresponding to such flows, in terms of their
SU(2) structure.Comment: 28 pages plus appendixes. Version to appear in JHE | Holographic Flows in non-Abelian T-dual Geometries | holographic flows in non-abelian t-dual geometries | abelian duality supergravity lifts interpolate geometries. initiate holographic backgrounds flows conformal points. elegant formulation abelian duality acting backgrounds flows pages appendixes. | non_dup | [] |
29546872 | 10.1007/JHEP11(2015)213 | We investigate the supersymmetric Wilson loops in $d=3$ $\mathcal{N}=4$ super
Chern-Simons-matter theory obtained from non-chiral orbifold of ABJM theory. We
work in both Minkowski spacetime and Euclidean space, and we construct 1/4 and
1/2 BPS Wilson loops. We also provide a complete proof that the difference
between 1/4 and 1/2 Wilson loops is $Q$-exact with $Q$ being some supercharge
that is preserved by both the 1/4 and 1/2 Wilson loops. This plays an important
role in applying the localization techniques to compute the vacuum expectation
values of Wilson loops. We also study the M-theory dual of the 1/2 BPS circular
Wilson loop.Comment: V1, 35 pages; V2, 36 pages, references added; V3, 36 pages, typos
corrected, more or less published versio | Supersymmetric Wilson loops in N=4 super Chern-Simons-matter theory | supersymmetric wilson loops in n=4 super chern-simons-matter theory | supersymmetric wilson loops mathcal super chern simons chiral orbifold abjm theory. minkowski spacetime euclidean wilson loops. wilson loops supercharge preserved wilson loops. plays localization expectation wilson loops. circular wilson pages pages pages typos corrected versio | non_dup | [] |
29535791 | 10.1007/JHEP11(2015)215 | The quark-connected leading-order hadronic contributions to the running of
the electromagnetic fine structure constant, $\alpha_{\rm QED}$, and the weak
mixing angle, $\theta_W$, are determined by a four-flavour lattice QCD
computation with twisted mass fermions. Full agreement of the results with a
phenomenological analysis is observed with an even comparable statistical
uncertainty. We show that the uncertainty of the lattice calculation is
dominated by systematic effects which then leads to significantly larger errors
than obtained by the phenomenological analysis.Comment: 15 pages, 13 figures, 6 tables; matches the published versio | Leading hadronic contributions to the running of the electroweak
coupling constants from lattice QCD | leading hadronic contributions to the running of the electroweak coupling constants from lattice qcd | hadronic running electromagnetic fine alpha theta flavour twisted fermions. phenomenological comparable uncertainty. dominated phenomenological pages tables matches versio | non_dup | [] |
29560101 | 10.1007/JHEP11(2015)216 | The Hamilton-Jacobi method in holography has produced important results both
at a renormalization group (RG) fixed point and away from it. In this paper we
use the Hamilton-Jacobi method to compute the holographic trace anomaly for
four- and six-dimensional boundary conformal field theories (CFTs), assuming
higher-derivative gravity and interactions of scalar fields in the bulk. The
scalar field contributions to the anomaly appear in CFTs with exactly marginal
operators. Moving away from the fixed point, we show that the Hamilton-Jacobi
formalism provides a deep connection between the holographic and the local RG.
We derive the local RG equation holographically, and verify explicitly that it
satisfies Weyl consistency conditions stemming from the commutativity of Weyl
scalings. We also consider massive scalar fields in the bulk corresponding to
boundary relevant operators, and comment on their effects to the local RG
equation.Comment: 27 pages. v3: References adde | Holographic Trace Anomaly and Local Renormalization Group | holographic trace anomaly and local renormalization group | hamilton jacobi holography renormalization away hamilton jacobi holographic trace anomaly conformal cfts bulk. anomaly cfts marginal operators. moving away hamilton jacobi formalism connection holographic derive holographically verify explicitly satisfies weyl consistency stemming commutativity weyl scalings. massive comment pages. adde | non_dup | [] |
29565448 | 10.1007/JHEP11(2015)217 | In this paper we construct a CHY representation for all tree-level primitive
QCD amplitudes. The quarks may be massless or massive. We define a generalised
cyclic factor $\hat{C}(w,z)$ and a generalised permutation invariant function
$\hat{E}(z,p,\varepsilon)$. The amplitude is then given as a contour integral
encircling the solutions of the scattering equations with the product $\hat{C}
\hat{E}$ as integrand. Equivalently, it is given as a sum over the inequivalent
solutions of the scattering equations, where the summand consists of a Jacobian
times the product $\hat{C} \hat{E}$. This representation separates information:
The generalised cyclic factor does not depend on the helicities of the external
particles, the generalised permutation invariant function does not depend on
the ordering of the external particles.Comment: 32 pages, version to be publishe | The CHY representation of tree-level primitive QCD amplitudes | the chy representation of tree-level primitive qcd amplitudes | primitive amplitudes. quarks massless massive. generalised cyclic generalised permutation varepsilon contour encircling integrand. equivalently inequivalent summand jacobian separates generalised cyclic helicities generalised permutation ordering pages publishe | non_dup | [] |
73371971 | 10.1007/JHEP11(2016)001 | We compute the hadronic matrix elements of the four-quark operators relevant
for $K^0-{\bar K^0}$ mixing beyond the Standard Model. Our results are from
lattice QCD simulations with $n_f=2+1$ flavours of domain-wall fermion, which
exhibit continuum-like chiral-flavour symmetry. The simulations are performed
at two different values of the lattice spacing ($a\sim0.08$ and $a\sim 0.11 \,
\fm $) and with lightest unitary pion mass $\sim 300\, \MeV$. For the first
time, the full set of relevant four-quark operators is renormalised
non-perturbatively through RI-SMOM schemes; a detailed description of the
renormalisation procedure is presented in a companion paper. We argue that the
intermediate renormalisation scheme is responsible for the discrepancies found
by different collaborations. We also study different normalisations and
determine the matrix elements of the relevant four-quark operators with a
precision of $\sim 5\%$ or better.Comment: 38 page | Neutral Kaon Mixing Beyond the Standard Model with $n_f=2+1$ Chiral
Fermions Part 1: Bare Matrix Elements and Physical Results | neutral kaon mixing beyond the standard model with $n_f=2+1$ chiral fermions part 1: bare matrix elements and physical results | hadronic model. flavours fermion exhibit continuum chiral flavour symmetry. spacing lightest unitary pion renormalised perturbatively smom schemes renormalisation companion paper. argue renormalisation discrepancies collaborations. normalisations precision | non_dup | [] |
73362164 | 10.1007/JHEP11(2016)003 | We introduce three right-handed neutrinos and three sterile neutrinos, and
consider an inverse seesaw mechanism for neutrino mass generation. From
naturalness point of view, their Majorana masses should be small, while it
induces a large neutrino Yukawa coupling. Then, a neutrinoless double beta
decay rate can be enhanced, and a sizable Higgs mass correction is inevitable.
We find that the enhancement rate can be more than ten times compared with a
standard prediction from light neutrino contribution alone, and an analytic
form of heavy neutrino contributions to the Higgs mass correction. In addition,
we numerically analyze the model, and find almost all parameter space of the
model can be complementarily searched by future experiments of neutrinoless
double beta decay and $\mu \to e$ conversion.Comment: 19 pages, 6 figures: version accepted for publication in JHE | Naturalness and lepton number/flavor violation in inverse seesaw models | naturalness and lepton number/flavor violation in inverse seesaw models | handed neutrinos sterile neutrinos seesaw generation. naturalness majorana induces yukawa coupling. neutrinoless beta sizable inevitable. enhancement analytic correction. numerically analyze complementarily searched neutrinoless beta pages publication | non_dup | [] |
73362452 | 10.1007/JHEP11(2016)004 | We provide a set of tools for analyzing the geometry of elliptically fibered
Calabi-Yau manifolds, starting with a description of the total space rather
than with a Weierstrass model or a specified type of fiber/base. Such an
approach to the subject of F-theory compactification makes certain geometric
properties, which are usually hidden, manifest. Specifically, we review how to
isolate genus-one fibrations in such geometries and then describe how to find
their sections explicitly. This includes a full parameterization of the
Mordell-Weil group where non-trivial. We then describe how to analyze the
associated Weierstrass models, Jacobians and resolved geometries. We illustrate
our discussion with concrete examples which are complete intersections in
products of projective spaces (CICYs). The examples presented include cases
exhibiting non-abelian symmetries and higher rank Mordell-Weil group. We also
make some comments on non-flat fibrations in this context. In a companion paper
[1] to this one, these results will be used to analyze the consequences for
string dualities of the ubiquity of multiple fibrations in known constructions
of Calabi-Yau manifolds.Comment: 49 pages, 3 figure | Tools for CICYs in F-theory | tools for cicys in f-theory | analyzing elliptically fibered calabi manifolds weierstrass specified fiber base. compactification geometric hidden manifest. isolate genus fibrations geometries explicitly. parameterization mordell weil trivial. analyze weierstrass jacobians resolved geometries. illustrate concrete intersections projective cicys exhibiting abelian symmetries mordell weil group. comments fibrations context. companion analyze consequences dualities ubiquity fibrations constructions calabi pages | non_dup | [] |
73373848 | 10.1007/JHEP11(2016)005 | We construct a world-sheet action for Green-Schwarz superstring in terms of
doubled-yet-gauged spacetime coordinates. For an arbitrarily curved NS-NS
background, the action possesses $\mathbf{O}(10,10)$ T-duality,
$\mathbf{Spin}(1,9)\times\mathbf{Spin}(9,1)$ Lorentz symmetry, coordinate gauge
symmetry, spacetime doubled-yet-gauged diffeomorphisms, world-sheet
diffeomorphisms and Weyl symmetry. Further, restricted to flat backgrounds, it
enjoys maximal spacetime supersymmetry and kappa-symmetry. After the auxiliary
coordinate gauge symmetry potential being integrated out, our action can
consistently reduce to the original undoubled Green-Schwarz action. Thanks to
the twofold spin groups, the action is unique: it is specific choices of the
NS-NS backgrounds that distinguish IIA or IIB, as well as lead to
non-Riemannian or non-relativistic superstring a la Gomis-Ooguri which might
deserve the nomenclature, type IIC.Comment: 1+27 pages. No figure. v2) Wess-Zumino term identified, More Refs. To
be published in JHE | Green-Schwarz superstring on doubled-yet-gauged spacetime | green-schwarz superstring on doubled-yet-gauged spacetime | sheet schwarz superstring doubled gauged spacetime coordinates. arbitrarily curved possesses mathbf duality mathbf mathbf lorentz coordinate spacetime doubled gauged diffeomorphisms sheet diffeomorphisms weyl symmetry. restricted backgrounds enjoys maximal spacetime supersymmetry kappa symmetry. auxiliary coordinate consistently undoubled schwarz action. thanks twofold choices backgrounds distinguish riemannian relativistic superstring gomis ooguri deserve nomenclature pages. figure. wess zumino refs. | non_dup | [] |
42684445 | 10.1007/JHEP11(2016)006 | We construct an extremal chiral $\mathcal N=4$ superconformal field theory
with central charge 24 from a $\mathbb Z_2$ orbifold of the chiral bosonic
theory with target $\mathbb R^{24}/\Lambda$, where $\Lambda$ is the Niemeier
lattice with root system $A_2^{12}$. This construction is analogous to
constructions of extremal chiral $\mathcal N=1$ and $\mathcal N=2$ CFTs with
$c=24$, where $\Lambda = \Lambda_{Leech}$ and the Niemeier lattice with root
system $A_1^{24}$, respectively. The theory has a discrete symmetry group
related to the sporadic group $M_{11}$.Comment: 18 pages + 12 pages of appendice | Extremal chiral $\mathcal N=4$ SCFT with $c=24$ | extremal chiral $\mathcal n=4$ scft with $c=24$ | extremal chiral mathcal superconformal mathbb orbifold chiral bosonic mathbb lambda lambda niemeier analogous constructions extremal chiral mathcal mathcal cfts lambda lambda leech niemeier respectively. sporadic .comment pages pages appendice | non_dup | [] |
42723135 | 10.1007/JHEP11(2016)007 | In this paper we investigate the ratio of shear viscosity to entropy density,
$\eta/s$, in hyperscaling violating geometry with lattice structure. We show
that the scaling relation with hyperscaling violation gives a strong constraint
to the mass of graviton and usually leads to a power law of temperature,
$\eta/s\sim T^\kappa$. We find the exponent $\kappa$ can be greater than two
such that the new bound for viscosity raised in arXiv:1601.02757 is violated.
Our above observation is testified by constructing specific solutions with UV
completion in various holographic models. Finally, we compare the boundedness
of $\kappa$ with the behavior of entanglement entropy and conjecture a relation
between them.Comment: 38 pages, 8 figures: 1 appendix added, 2 figures added, 1 references
adde | Holographic Shear Viscosity in Hyperscaling Violating Theories without
Translational Invariance | holographic shear viscosity in hyperscaling violating theories without translational invariance | viscosity hyperscaling violating structure. hyperscaling violation graviton kappa exponent kappa viscosity raised violated. testified constructing completion holographic models. boundedness kappa entanglement conjecture pages adde | non_dup | [] |
42670922 | 10.1007/JHEP11(2016)009 | Tensor networks provide a natural framework for exploring holographic duality
because they obey entanglement area laws. They have been used to construct
explicit toy models realizing many interesting structural features of the
AdS/CFT correspondence, including the non-uniqueness of bulk operator
reconstruction in the boundary theory. In this article, we explore the
holographic properties of networks of random tensors. We find that our models
naturally incorporate many features that are analogous to those of the AdS/CFT
correspondence. When the bond dimension of the tensors is large, we show that
the entanglement entropy of boundary regions, whether connected or not, obey
the Ryu-Takayanagi entropy formula, a fact closely related to known properties
of the multipartite entanglement of assistance. Moreover, we find that each
boundary region faithfully encodes the physics of the entire bulk entanglement
wedge. Our method is to interpret the average over random tensors as the
partition function of a classical ferromagnetic Ising model, so that the
minimal surfaces of Ryu-Takayanagi appear as domain walls. Upon including the
analog of a bulk field, we find that our model reproduces the expected
corrections to the Ryu-Takayanagi formula: the minimal surface is displaced and
the entropy is augmented by the entanglement of the bulk field. Increasing the
entanglement of the bulk field ultimately changes the minimal surface
topologically in a way similar to creation of a black hole. Extrapolating bulk
correlation functions to the boundary permits the calculation of the scaling
dimensions of boundary operators, which exhibit a large gap between a small
number of low-dimension operators and the rest. While we are primarily
motivated by AdS/CFT duality, our main results define a more general form of
bulk-boundary correspondence which could be useful for extending holography to
other spacetimes.Comment: 57 pages, 13 figure | Holographic duality from random tensor networks | holographic duality from random tensor networks | exploring holographic duality obey entanglement laws. realizing correspondence uniqueness reconstruction theory. explore holographic tensors. naturally incorporate analogous correspondence. bond tensors entanglement obey takayanagi closely multipartite entanglement assistance. faithfully encodes entanglement wedge. interpret tensors partition ferromagnetic ising takayanagi walls. analog reproduces takayanagi displaced augmented entanglement field. entanglement ultimately topologically creation hole. extrapolating permits exhibit rest. primarily motivated duality correspondence extending holography pages | non_dup | [] |
73375386 | 10.1007/JHEP11(2016)010 | The baryon asymmetry of the Universe should have been produced after the
inflation era. We consider the possibility that the asymmetry is generated by
the flavor oscillations in the reheating process after inflation, so that the
baryon asymmetry is realized already at the beginning of the radiation
dominated era. In the seesaw model, we show that the propagators of the
left-handed leptons generically have flavor mixings in the thermal background,
that can generate flavor-dependent lepton asymmetry through the $CP$ violation
in the oscillation phenomena. The flavor dependent rates for the wash-out
process can leave the net asymmetry today.Comment: 10 pages; published version(v2 | Primordial Lepton Oscillations and Baryogenesis | primordial lepton oscillations and baryogenesis | baryon asymmetry universe inflation era. asymmetry flavor oscillations reheating inflation baryon asymmetry realized beginning dominated era. seesaw propagators handed leptons generically flavor mixings flavor lepton asymmetry violation oscillation phenomena. flavor wash leave asymmetry pages | non_dup | [] |
42660285 | 10.1007/JHEP11(2016)011 | The process $pp \to W^-c$ produces polarized charm quarks. The polarization
is expected to be partly retained in $\Lambda_c$ baryons when those form in the
$c$-quark hadronization. We argue that it will likely be possible for ATLAS and
CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ samples in Run 2 of
the LHC. This can become the first measurement ever of a longitudinal
polarization of charm quarks. Its results will provide a unique input to the
understanding of polarization transfer in fragmentation. They will also allow
applying the same measurement technique to other (e.g., new physics) samples of
charm quarks in which the polarization is a priori unknown. The proposed
analysis is similar to the ATLAS and CMS measurements of the $W$+$c$ cross
section in the 7 TeV run that used reconstructed $D$-meson decays for charm
tagging.Comment: 18 pages, 3 figures; v2: minor improvements; published versio | Measuring c-quark polarization in W+c samples at ATLAS and CMS | measuring c-quark polarization in w+c samples at atlas and cms | produces polarized charm quarks. partly retained lambda baryons hadronization. argue atlas lambda lhc. ever longitudinal charm quarks. fragmentation. e.g. charm quarks priori unknown. atlas reconstructed meson decays charm pages minor improvements versio | non_dup | [] |
42733746 | 10.1007/JHEP11(2016)012 | Lysov, Pasterski and Strominger have shown how Low's subleading soft photon
theorem can be understood as Ward identities of new symmetries of massless QED.
In this paper we offer a different perspective and show that there exists a
class of large $U(1)$ gauge transformations such that (i) the associated
(electric and magnetic) charges can be computed from first principles (ii)
their Ward identities are equivalent to Low's theorem. Our framework paves the
way to analyze the sub-subleading theorem in gravity in terms of Ward
identities associated to large diffeomorphisms.Comment: 17 page | Subleading soft photons and large gauge transformations | subleading soft photons and large gauge transformations | lysov pasterski strominger subleading understood ward identities symmetries massless qed. offer perspective transformations charges principles ward identities theorem. paves analyze subleading ward identities | non_dup | [] |
73393723 | 10.1007/JHEP11(2016)015 | Interacting theories of N relativistic fermion flavors in reducible spinor
representations in 2+1 spacetime dimensions are formulated on a lattice using
domain wall fermions (DWF), for which a U(2N) global symmetry is recovered in
the limit that the wall separation $L_s$ is made large. The Gross-Neveu (GN)
model is studied in the large-N limit and an exponential acceleration of
convergence to the large-$L_s$ limit is demonstrated if the usual
parity-invariant mass $m\bar\psi\psi$ is replaced by the U(2N)-equivalent
$im_3\bar\psi\gamma_3\psi$. The GN model and two lattice variants of the
Thirring model are simulated for N = 2 using a hybrid Monte Carlo algorithm,
and studies made of the symmetry-breaking bilinear condensate and its
associated susceptibility, the axial Ward identity, and the mass spectrum of
both fermion and meson excitations. Comparisons are made with existing results
obtained using staggered fermions. For the GN model a symmetry-breaking phase
transition is observed, the Ward identity is recovered, and the spectrum found
to be consistent with large-N expectations. There appears to be no obstruction
to the study of critical UV fixed-point physics using DWF. For the Thirring
model the Ward identity is not recovered, the spectroscopy measurements are
inconclusive, and no symmetry breaking is observed all the way up to the
effective strong coupling limit. This is consistent with a critical Thirring
flavor number $N_c<2$, contradicting earlier staggered fermion results.Comment: 31 pages, 15 figure | Towards Critical Physics in 2+1d with U(2N)-Invariant Fermions | towards critical physics in 2+1d with u(2n)-invariant fermions | interacting relativistic fermion flavors reducible spinor representations spacetime formulated fermions recovered large. gross neveu exponential acceleration usual parity replaced gamma variants thirring hybrid monte carlo breaking bilinear condensate susceptibility axial ward fermion meson excitations. comparisons staggered fermions. breaking ward recovered expectations. obstruction dwf. thirring ward recovered spectroscopy inconclusive breaking limit. thirring flavor contradicting staggered fermion pages | non_dup | [] |
42748599 | 10.1007/JHEP11(2016)016 | We describe the infinitesimal moduli space of pairs $(Y, V)$ where $Y$ is a
manifold with $G_2$ holonomy, and $V$ is a vector bundle on $Y$ with an
instanton connection. These structures arise in connection to the moduli space
of heterotic string compactifications on compact and non-compact seven
dimensional spaces, e.g. domain walls. Employing the canonical $G_2$ cohomology
developed by Reyes-Carri\'on and Fern\'andez and Ugarte, we show that the
moduli space decomposes into the sum of the bundle moduli
$H^1_{\check{d}_A}(Y,\mathrm{End}(V))$ plus the moduli of the $G_2$ structure
preserving the instanton condition. The latter piece is contained in
$H^1_{\check{d}_\theta}(Y,TY)$, and is given by the kernel of a map
${\cal\check F}$ which generalises the concept of the Atiyah map for
holomorphic bundles on complex manifolds to the case at hand. In fact, the map
${\cal\check F}$ is given in terms of the curvature of the bundle and maps
$H^1_{\check{d}_\theta}(Y,TY)$ into $H^2_{\check{d}_A}(Y,\mathrm{End}(V))$, and
moreover can be used to define a cohomology on an extension bundle of $TY$ by
$\mathrm{End}(V)$. We comment further on the resemblance with the holomorphic
Atiyah algebroid and connect the story to physics, in particular to heterotic
compactifications on $(Y,V)$ when $\alpha'=0$.Comment: 51 pages, minor corrections, references adde | Infinitesimal moduli of G2 holonomy manifolds with instanton bundles | infinitesimal moduli of g2 holonomy manifolds with instanton bundles | infinitesimal moduli manifold holonomy bundle instanton connection. arise connection moduli heterotic compactifications seven e.g. walls. employing canonical cohomology reyes carri fern andez ugarte moduli decomposes bundle moduli check mathrm moduli preserving instanton condition. piece check theta kernel check generalises atiyah holomorphic bundles manifolds hand. check curvature bundle check theta check mathrm cohomology bundle mathrm comment resemblance holomorphic atiyah algebroid connect story heterotic compactifications alpha .comment pages minor adde | non_dup | [] |
42725792 | 10.1007/JHEP11(2016)017 | We study the fate of weakly coupled dual QED3 in the infrared, that is, a
single two-component Dirac fermion coupled to an emergent U(1) gauge field, but
without Chern-Simons term. This theory has recently been proposed as a dual
description of 2D surfaces of certain topological insulators. Using the
renormalization group, we find that the interplay of gauge fluctuations with
generated interactions in the four-fermi sector stabilizes an interacting
conformal field theory (CFT) with finite four-fermi coupling in the infrared.
The emergence of this CFT is due to cancellations in the $\beta$-function of
the four-fermi coupling special to "NF = 1/2". We also quantify how a possible
"strong" Dirac fermion duality between a free Dirac cone and dual QED3 would
constrain the universal constants of the topological current correlator of the
latter.Comment: 21 pages, 8 figures; v2 minor typos fixe | Dual QED3 at "NF = 1/2" is an interacting CFT in the infrared | dual qed3 at "nf = 1/2" is an interacting cft in the infrared | fate weakly infrared dirac fermion emergent chern simons term. topological insulators. renormalization interplay fermi stabilizes interacting conformal fermi infrared. emergence cancellations beta fermi quantify dirac fermion duality dirac cone constrain universal topological correlator pages minor typos fixe | non_dup | [] |
42750573 | 10.1007/JHEP11(2016)018 | In this paper, we investigate predictions of the SO(10) Grand Unified Theory
(GUT), where an extra U(1)$^\prime$ gauge symmetry remains up to the
supersymmetry (SUSY) breaking scale. The minimal setup of SO(10) GUT unifies
quarks and leptons into a ${\bf 16}$-representational field in each
generations. The setup, however, suffers from the realization of the realistic
Yukawa couplings at the electroweak scale. In order to solve this problem, we
introduce ${\bf 10}$-representational matter fields, and then the two kinds of
matter fields mix with each other at the SUSY breaking scale, where the extra
U(1)$^\prime$ gauge symmetry breaks down radiatively. One crucial prediction is
that the Standard Model quarks and leptons are given by the linear combinations
of the fields with two different U(1)$^\prime$ charges. The mixing also depends
on the flavor. Consequently, the U(1)$^\prime$ interaction becomes flavor
violating, and the flavor physics is the smoking-gun signal of our GUT model.
The flavor violating $Z'$ couplings are related to the fermion masses and the
CKM matrix, so that we can derive some explicit predictions in flavor physics.
We especially discuss $K$-$\overline{K}$ mixing, $B_{(s)}$-$\overline{B_{(s)}}$
mixing, and the (semi)leptonic decays of $K$ and $B$ in our model. We also
study the flavor violating $\mu$ and $\tau$ decays and discuss the correlations
among the physical observables in this SO(10) GUT framework.Comment: 30 pages, 20 figures, v2 : texts are improved, comments and
references are adde | Flavor physics induced by light $Z'$ from SO(10) GUT | flavor physics induced by light $z'$ from so(10) gut | grand unified extra prime supersymmetry susy breaking scale. setup unifies quarks leptons representational generations. setup suffers realization realistic yukawa couplings electroweak scale. solve representational kinds susy breaking extra prime breaks radiatively. crucial quarks leptons combinations prime charges. flavor. prime flavor violating flavor smoking model. flavor violating couplings fermion derive flavor physics. overline overline leptonic decays model. flavor violating decays observables pages texts comments adde | non_dup | [] |
42753467 | 10.1007/JHEP11(2016)020 | We study N = 2* theories with gauge group U(N) and use equivariant
localization to calculate the quantum expectation values of the simplest chiral
ring elements. These are expressed as an expansion in the mass of the adjoint
hypermultiplet, with coefficients given by quasi-modular forms of the S-duality
group. Under the action of this group, we construct combinations of chiral ring
elements that transform as modular forms of definite weight. As an independent
check, we confirm these results by comparing the spectral curves of the
associated Hitchin system and the elliptic Calogero-Moser system. We also
propose an exact and compact expression for the 1-instanton contribution to the
expectation value of the chiral ring elements.Comment: 37 page | Chiral observables and S-duality in N = 2* U(N) gauge theories | chiral observables and s-duality in n = 2* u(n) gauge theories | equivariant localization expectation simplest chiral elements. adjoint hypermultiplet quasi modular duality group. combinations chiral transform modular definite weight. check confirm hitchin elliptic calogero moser system. propose instanton expectation chiral | non_dup | [] |
42739828 | 10.1007/JHEP11(2016)022 | We discuss a left-right symmetric extension of the Standard Model in which
the three additional right-handed neutrinos play a central role in explaining
the baryon asymmetry of the Universe, the dark matter abundance and the ultra
energetic signal detected by the IceCube experiment. The energy spectrum and
neutrino flux measured by IceCube are ascribed to the decays of the lightest
right-handed neutrino $N_1$, thus fixing its mass and lifetime, while the
production of $N_1$ in the primordial thermal bath occurs via a freeze-in
mechanism driven by the additional $SU(2)_R$ interactions. The constraints
imposed by IceCube and the dark matter abundance allow nonetheless the heavier
right-handed neutrinos to realize a standard type-I seesaw leptogenesis, with
the $B-L$ asymmetry dominantly produced by the next-to-lightest neutrino $N_2$.
Further consequences and predictions of the model are that: the $N_1$
production implies a specific power-law relation between the reheating
temperature of the Universe and the vacuum expectation value of the $SU(2)_R$
triplet; leptogenesis imposes a lower bound on the reheating temperature of the
Universe at $7\times10^9\,\mbox{GeV}$. Additionally, the model requires a
vanishing absolute neutrino mass scale $m_1\simeq0$.Comment: 19 pages, 4 figures. Constraints from cosmic-ray antiprotons and
gamma rays added, with hadrophobic assignment of the matter multiplets to
satisfy bounds. References added. Matches version published in JHE | A consistent model for leptogenesis, dark matter and the IceCube signal | a consistent model for leptogenesis, dark matter and the icecube signal | handed neutrinos explaining baryon asymmetry universe abundance ultra energetic icecube experiment. icecube ascribed decays lightest handed fixing lifetime primordial bath freeze interactions. imposed icecube abundance nonetheless heavier handed neutrinos realize seesaw leptogenesis asymmetry dominantly lightest consequences reheating universe expectation triplet leptogenesis imposes reheating universe mbox additionally vanishing simeq .comment pages figures. cosmic antiprotons gamma rays hadrophobic assignment multiplets satisfy bounds. added. matches | non_dup | [] |
42727970 | 10.1007/JHEP11(2016)024 | Higgs mechanism to massive higher-spin gauge fields is an outstanding open
problem. We investigate this issue in the context of Kaluza-Klein
compactification. Starting from a free massless higher-spin field in
$(d+2)$-dimensional anti-de Sitter space and compactifying over a finite
angular wedge, we obtain an infinite tower of heavy, light and massless
higher-spin fields in $(d+1)$-dimensional anti-de Sitter space. All massive
higher-spin fields are described gauge invariantly in terms of St\"ueckelberg
fields. The spectrum depends on the boundary conditions imposed at both ends of
the wedges. We obseved that higher-derivative boundary condition is inevitable
for spin greater than three. For some higher-derivative boundary conditions,
equivalently, spectrum-dependent boundary conditions, we get a non-unitary
representation of partially-massless higher-spin fields of varying depth. We
present intuitive picture which higher-derivative boundary conditions yield
non-unitary system in terms of boundary action. We argue that isotropic
Lifshitz interfaces in $O(N)$ Heisenberg magnet or $O(N)$ Gross-Neveu model
provides the holographic dual conformal field theory and propose experimental
test of (inverse) Higgs mechanism for massive and partially massless
higher-spin fields.Comment: v1. 62 pages, 7 figures, v2. 68 pages, 8 figures, published versio | Massless and Massive Higher Spins from Anti-de Sitter Space Waveguide | massless and massive higher spins from anti-de sitter space waveguide | massive outstanding problem. kaluza klein compactification. massless sitter compactifying wedge infinite tower massless sitter space. massive invariantly ueckelberg fields. imposed ends wedges. obseved inevitable three. equivalently unitary partially massless depth. intuitive picture unitary action. argue isotropic lifshitz interfaces heisenberg magnet gross neveu holographic conformal propose massive partially massless pages pages versio | non_dup | [] |
73367920 | 10.1007/JHEP11(2016)026 | We fit the next-to-leading order unitarity conditions to the
Two-Higgs-Doublet model with a softly broken $\mathbb{Z}_2$ symmetry. In doing
so, we alleviate the existing uncertainty on how to treat higher order
corrections to quartic couplings of its Higgs potential. A simplified approach
to implementing the next-to-leading order unitarity conditions is presented.
These new bounds are then combined with all other relevant constraints,
including the complete set of LHC Run I data. The upper $95\%$ bounds we find
are $4.2$ on the absolute values of the quartic couplings, and $235$ GeV ($100$
GeV) for the mass degeneracies between the heavy Higgs particles in the type I
(type II) scenario. In type II, we exclude an unbroken $\mathbb{Z}_2$ symmetry
with a probability of $95\%$. All fits are performed using the open-source code
HEPfit.Comment: 33 pages, 13 figures, 5 tables. Comments are welcom | Next-to-leading order unitarity fits in Two-Higgs-Doublet models with
soft $\mathbb{Z}_2$ breaking | next-to-leading order unitarity fits in two-higgs-doublet models with soft $\mathbb{z}_2$ breaking | unitarity doublet softly broken mathbb symmetry. alleviate treat quartic couplings potential. simplified implementing unitarity presented. bounds data. bounds quartic couplings degeneracies scenario. exclude unbroken mathbb fits pages tables. comments welcom | non_dup | [] |
42751613 | 10.1007/JHEP11(2016)027 | We propose a non-associative phase space algebra for M-theory backgrounds
with locally non-geometric fluxes based on the non-associative algebra of
octonions. Our proposal is based on the observation that the non-associative
algebra of the non-geometric R-flux background in string theory can be obtained
by a proper contraction of the simple Malcev algebra generated by imaginary
octonions. Furthermore, by studying a toy model of a four-dimensional locally
non-geometric M-theory background which is dual to a twisted torus, we show
that the non-geometric background is "missing" a momentum mode. The resulting
seven-dimensional phase space can thus be naturally identified with the
imaginary octonions. This allows us to interpret the full uncontracted algebra
of imaginary octonions as the uplift of the string theory R-flux algebra to
M-theory, with the contraction parameter playing the role of the string
coupling constant $g_s$.Comment: 27 page | Non-associativity in non-geometric string and M-theory backgrounds, the
algebra of octonions, and missing momentum modes | non-associativity in non-geometric string and m-theory backgrounds, the algebra of octonions, and missing momentum modes | propose associative backgrounds locally geometric fluxes associative octonions. proposal associative geometric proper contraction malcev imaginary octonions. studying locally geometric twisted torus geometric missing mode. seven naturally imaginary octonions. interpret uncontracted imaginary octonions uplift contraction playing .comment | non_dup | [] |
42752645 | 10.1007/JHEP11(2016)028 | We provide a gravitational argument in favour of the covariant holographic
entanglement entropy proposal. In general time-dependent states, the proposal
asserts that the entanglement entropy of a region in the boundary field theory
is given by a quarter of the area of a bulk extremal surface in Planck units.
The main element of our discussion is an implementation of an appropriate
Schwinger-Keldysh contour to obtain the reduced density matrix (and its powers)
of a given region, as is relevant for the replica construction. We map this
contour into the bulk gravitational theory, and argue that the saddle point
solutions of these replica geometries lead to a consistent prescription for
computing the field theory Renyi entropies. In the limiting case where the
replica index is taken to unity, a local analysis suffices to show that these
saddles lead to the extremal surfaces of interest. We also comment on various
properties of holographic entanglement that follow from this construction.Comment: 39 pages. 9 figure | Deriving covariant holographic entanglement | deriving covariant holographic entanglement | gravitational argument favour covariant holographic entanglement proposal. proposal asserts entanglement quarter extremal planck units. schwinger keldysh contour powers replica construction. contour gravitational argue saddle replica geometries prescription renyi entropies. limiting replica unity suffices saddles extremal interest. comment holographic entanglement pages. | non_dup | [] |
42746783 | 10.1007/JHEP11(2016)029 | We construct renormalizable Standard Model extensions, valid up to the Planck
scale, that give a composite Higgs from a new fundamental strong force acting
on fermions and scalars. Yukawa interactions of these particles with Standard
Model fermions realize the partial compositeness scenario. Under certain
assumptions on the dynamics of the scalars, successful models exist because
gauge quantum numbers of Standard Model fermions admit a minimal enough 'square
root'. Furthermore, right-handed SM fermions have an SU(2)$_R$-like structure,
yielding a custodially-protected composite Higgs. Baryon and lepton numbers
arise accidentally. Standard Model fermions acquire mass at tree level, while
the Higgs potential and flavor violations are generated by quantum corrections.
We further discuss accidental symmetries and other dynamical features stemming
from the new strongly interacting scalars. If the same phenomenology can be
obtained from models without our elementary scalars, they would reappear as
composite states.Comment: 36 pages, 3 figures, 5 tables. v2: final published version, expanded
discussion about neutrino masses, dark matter and flavou | Fundamental partial compositeness | fundamental partial compositeness | renormalizable extensions valid planck composite acting fermions scalars. yukawa fermions realize compositeness scenario. assumptions scalars successful fermions admit handed fermions yielding custodially protected composite higgs. baryon lepton arise accidentally. fermions acquire flavor violations corrections. accidental symmetries stemming interacting scalars. phenomenology elementary scalars reappear composite pages tables. expanded flavou | non_dup | [] |
42742910 | 10.1007/JHEP11(2016)030 | We use the numerical conformal bootstrap in two dimensions to search for
finite, closed sub-algebras of the operator product expansion (OPE), without
assuming unitarity. We find the minimal models as special cases, as well as
additional lines of solutions that can be understood in the Coulomb gas
formalism. All the solutions we find that contain the vacuum in the operator
algebra are cases where the external operators of the bootstrap equation are
degenerate operators, and we argue that this follows analytically from the
expressions in arXiv:1202.4698 for the crossing matrices of Virasoro conformal
blocks. Our numerical analysis is a special case of the "Gliozzi" bootstrap
method, and provides a simpler setting in which to study technical challenges
with the method.
In the supplementary material, we provide a Mathematica notebook that
automates the calculation of the crossing matrices and OPE coefficients for
degenerate operators using the formulae of Dotsenko and Fateev.Comment: 11 figures, 24+19 page | Closure of the Operator Product Expansion in the Non-Unitary Bootstrap | closure of the operator product expansion in the non-unitary bootstrap | conformal bootstrap algebras unitarity. understood coulomb formalism. bootstrap degenerate argue analytically expressions crossing virasoro conformal blocks. gliozzi bootstrap simpler challenges method. supplementary mathematica notebook automates crossing degenerate formulae dotsenko | non_dup | [] |
73390677 | 10.1007/JHEP11(2016)032 | We study butterfly effect in $D$-dimensional gravitational theories
containing terms quadratic in Ricci scalar and Ricci tensor. One observes that
due to higher order derivatives in the corresponding equations of motion there
are two butterfly velocities. The velocities are determined by the dimension of
operators whose sources are provided by the metric. The three dimensional TMG
model is also studied where we get two butterfly velocities at generic point of
the moduli space of parameters. At critical point two velocities coincide.Comment: 16 pages, references adde | On Butterfly effect in Higher Derivative Gravities | on butterfly effect in higher derivative gravities | butterfly gravitational quadratic ricci ricci tensor. observes derivatives butterfly velocities. velocities metric. butterfly velocities generic moduli parameters. velocities pages adde | non_dup | [] |
42741081 | 10.1007/JHEP11(2016)036 | In this paper we present the null string origin of the ambitwistor string.
Classically, the null string is the tensionless limit of string theory, and so
too is the Ambitwistor string. Both have as constraint algebra the Galilean
Conformal Algebra in two dimensions. But something interesting happens in the
quantum theory since there is an ambiguity in quantizing the null string. We
show that, given a particular choice of quantization scheme and a particular
gauge, the null string coincides with the ambitwistor string both classically
and quantum mechanically. We also show that the same holds for the spinning
versions of the null string and Ambitwistor string. With these results we
clarify the relationship between the Ambitwistor string, the null string, the
usual string and the Hohm-Siegel-Zwiebach theory.Comment: 22 pages, 1 figur | On the null origin of the ambitwistor string | on the null origin of the ambitwistor string | ambitwistor string. classically tensionless ambitwistor string. galilean conformal dimensions. something happens ambiguity quantizing string. quantization coincides ambitwistor classically mechanically. spinning versions ambitwistor string. clarify ambitwistor usual hohm siegel zwiebach pages figur | non_dup | [] |
73366066 | 10.1007/JHEP11(2016)040 | Double trace deformations, that is products of two local operators, define
perturbations of conformal field theories that can be studied exactly in the
large-N limit. Even when the double trace deformation is irrelevant in the
infrared, it is believed to flow to an ultraviolet fixed point. In this note we
define the Kallen-Lehmann representation of the two-point function of a local
operator O in a theory perturbed by the square of such operator. We use such
representation to discover potential pathologies at intermediate points in the
flow that may prevent to reach the UV fixed point. We apply the method to an
"extremal" deformation that naively would flow to a UV fixed point where the
operator O would saturate the unitarity bound. We find that the UV fixed point
is not conformal and that the deformed two-point function propagates unphysical
modes. We interpret the result as showing that the flow to the UV fixed point
does not exist. This resolves a potential puzzle in the holographic
interpretation of the deformation.Comment: 20 pages. Accepted by JHEP, extended discussion in Summary, added
references and fixed minor typo | Notes on Relevant, Irrelevant, Marginal and Extremal Double Trace
Perturbations | notes on relevant, irrelevant, marginal and extremal double trace perturbations | trace deformations perturbations conformal limit. trace deformation irrelevant infrared believed ultraviolet point. kallen lehmann perturbed operator. discover pathologies prevent point. extremal deformation naively saturate unitarity bound. conformal deformed propagates unphysical modes. interpret exist. resolves puzzle holographic pages. jhep minor typo | non_dup | [] |
73360978 | 10.1007/JHEP11(2016)042 | We revisit the fundamental string (F1) solution in the doubled formalism. We
show that the wave-like solution of double field theory (DFT) corresponding to
the F1/pp-wave duality pair is more properly a solution of the DFT action
coupled to a doubled sigma model action. The doubled string configuration which
sources the pp-wave can be thought of as static gauge with the string oriented
in a dual direction. We also discuss the DFT solution corresponding to a
vibrating string, carrying both winding and momentum. We further show that the
solution dual to the F1 in both time and space can be viewed as a "negative
string" solution. Negative branes are closely connected to certain exotic
string theories which involve unusual signatures for both spacetime and brane
worldvolumes. In order to better understand this from the doubled point of
view, we construct a variant of DFT suitable for describing theories in which
the fundamental string has a Euclidean worldsheet, for which T-dualities appear
to change the spacetime signature.Comment: 37 pages including 2 appendices, v2: version to appear in JHEP (typos
fixed, some minor comments added | Doubled strings, negative strings and null waves | doubled strings, negative strings and null waves | revisit doubled formalism. duality properly doubled sigma action. doubled thought oriented direction. vibrating carrying winding momentum. viewed solution. branes closely exotic involve unusual signatures spacetime brane worldvolumes. doubled variant describing euclidean worldsheet dualities spacetime pages appendices jhep typos minor comments | non_dup | [] |
73359833 | 10.1007/JHEP11(2016)044 | We generalize the boundary value problem with a mixed boundary condition that
involves the gauge and scalar fields in the context of Einstein-Maxwell-Dilaton
theories. In particular, the expectation value of the dual scalar operator can
be a function of the expectation value of the current operator. The properties
are prevalent in a fixed charge ensemble because the conserved charge is shared
by both fields through the dilaton coupling, which is also responsible for
non-Fermi liquid properties. We study the on-shell action and the stress energy
tensor to note practical importances of the boundary value problem. In the
presence of the scalar fields, physical quantities are not fully fixed due to
the finite boundary terms that manifest in the massless scalar or the scalar
with mass saturating the Breitenlohner-Freedman bound.Comment: 39+1 pages. Improved discussions, typos fixed and references adde | Holographic Renormalization of Einstein-Maxwell-Dilaton Theories | holographic renormalization of einstein-maxwell-dilaton theories | generalize involves einstein maxwell dilaton theories. expectation expectation operator. prevalent ensemble conserved shared dilaton fermi properties. practical importances problem. quantities manifest massless saturating breitenlohner freedman pages. discussions typos adde | non_dup | [] |