pinecone/core-2020-05-10-deduplication huggingface dataset:
5D UED: Flat and Flavorless

5D UED is not automatically minimally flavor violating. This is due to flavor
asymmetric counter-terms required on the branes. Additionally, there are likely
to be higher dimensional operators which directly contribute to flavor
observables. We document a mostly unsuccessful attempt at utilizing
localization in a flat extra dimension to resolve these flavor constraints
while maintaining KK-parity as a good quantum number. It is unsuccessful
insofar as we seem to be forced to add brane operators in such a way as to
precisely mimic the effects of a double throat warped extra dimension. In the
course of our efforts, we encounter and present solutions to a problem common
to many extra dimensional models in which fields are "doubly localized:"
ultra-light modes. Under scrutiny, this issue seems tied to an intrinsic
tension between maintaining Kaluza-Klein parity and resolving mass hierarchies
via localization.Comment: 27 pages, 6 figure
Short-cut to new anomalies in gravity duals to logarithmic conformal
  field theories

Various massive gravity theories in three dimensions are conjecturally dual
to logarithmic conformal field theories (LCFTs). We summarise the status of
these conjectures. LCFTs are characterised by the values of the central charges
and the so-called "new anomalies". We employ a short-cut to calculate these new
anomalies in generalised massive gravity and in the recently proposed
higher-derivative gravity theories with holographic c-theorem. Both cases
permit LCFTs exhibiting intriguing features, like rank three Jordan cells or
non-zero central charges. Finally, as an example we discuss in some detail the
partially massless version of new massive gravity, a theory with several
special properties that we call "partially massless gravity".Comment: 34 pages, 2 figures; v2: added references; v3: Several rewordings in
  the introduction and section 2, added references. Matches published versio
Correlators of Vertex Operators for Circular Strings with Winding
  Numbers in AdS5xS5

We compute semiclassically the two-point correlator of the marginal vertex
operators describing the rigid circular spinning string state with one large
spin and one windining number in AdS_5 and three large spins and three winding
numbers in S^5. The marginality condition and the conformal invariant
expression for the two-point correlator obtained by using an appropriate vertex
operator are shown to be associated with the diagonal and off-diagonal Virasoro
constraints respectively. We evaluate semiclassically the three-point
correlator of two heavy circular string vertex operators and one zero-momentum
dilaton vertex operator and discuss its relation with the derivative of the
dimension of the heavy circular string state with respect to the string
tension.Comment: 16 pages, LaTeX, no figure
Comments on Gaugino Mass and Landscape of Vacua

In direct gauge mediation, gaugino masses often vanish at the leading order
of supersymmetry breaking. Recently, this phenomenon is understood in
connection with the global structure of vacua in O'Raifeartaigh-type models. In
this note, we further explore a connection between gaugino masses and the
landscape of vacua in more general situations, focusing on a few examples which
demonstrate our idea. In particular, we present a calculable model with
non-vanishing leading order gaugino masses on the lowest energy vacuum.Comment: 9 pages; v2: reference added; v3: references added, minor changes,
  the version published in JHE
Hydrodynamics from charged black branes

We extend the recent work on fluid-gravity correspondence to charged
black-branes by determining the metric duals to arbitrary charged fluid
configuration up to second order in the boundary derivative expansion. We also
derive the energy-momentum tensor and the charge current for these
configurations up to second order in the boundary derivative expansion. We find
a new term in the charge current when there is a bulk Chern-Simons interaction
thus resolving an earlier discrepancy between thermodynamics of charged
rotating black holes and boundary hydrodynamics. We have also confirmed that
all our expressions are covariant under boundary Weyl-transformations as
expected.Comment: 0+ 31 Pages; v2: 0+33 pages, typos corrected and new sections (in
  appendix) added; v3:published versio
Vector boson plus one jet production in POWHEG

We present an implementation of the next-to-leading order vector boson plus
one jet production process in hadronic collision in the framework of POWHEG,
which is a method to implement NLO calculations within a Shower Monte Carlo
context. All spin correlations in the vector boson decay products have been
taken into account. The process has been implemented in the framework of the
POWHEG-BOX, an automated computer code for turning a NLO calculation into a
shower Monte Carlo program. We present phenomenological results for the case of
the Z/gamma plus one jet production process, obtained by matching the POWHEG
calculation with the shower performed by PYTHIA, for the LHC, and we compare
our results with available Tevatron data.Comment: 25 pages, 17 figure
Excited Hexagon Wilson Loops for Strongly Coupled N=4 SYM

This work is devoted to the six-gluon scattering amplitude in strongly
coupled N=4 supersymmetric Yang-Mills theory. At weak coupling, an appropriate
high energy limit of the so-called remainder function, i.e. of the deviation
from the BDS formula, may be understood in terms of the lowest eigenvalue of
the BFKL hamiltonian. According to Alday et al., amplitudes in the strongly
coupled theory can be constructed through an auxiliary 1-dimensional quantum
system. We argue that certain excitations of this quantum system determine the
Regge limit of the remainder function at strong coupling and we compute its
precise value.Comment: 25 pages, 5 figures; published version -- added deeper interpretation
  of the result
Bi-galileon theory II: phenomenology

We continue to introduce bi-galileon theory, the generalisation of the single
galileon model introduced by Nicolis et al. The theory contains two coupled
scalar fields and is described by a Lagrangian that is invariant under Galilean
shifts in those fields. This paper is the second of two, and focuses on the
phenomenology of the theory. We are particularly interesting in models that
admit solutions that are asymptotically self accelerating or asymptotically
self tuning. In contrast to the single galileon theories, we find examples of
self accelerating models that are simultaneously free from ghosts, tachyons and
tadpoles, able to pass solar system constraints through Vainshtein screening,
and do not suffer from problems with superluminality, Cerenkov emission or
strong coupling. We also find self tuning models and discuss how Weinberg's no
go theorem is evaded by breaking Poincar\'e invariance in the scalar sector.
Whereas the galileon description is valid all the way down to solar system
scales for the self-accelerating models, unfortunately the same cannot be said
for self tuning models owing to the scalars backreacting strongly on to the
geometry.Comment: Erratum added presenting arguments similar in spirit to those
  presented in 1303.0274, and alluding to the inevitability of superluminality
  in the absence of strong coupling . We emphasize, however, that the generic
  formalism developed here, and extensively used in 1303.0274, is correc
Fermions and Type IIB Supergravity On Squashed Sasaki-Einstein Manifolds

We discuss the dimensional reduction of fermionic modes in a recently found
class of consistent truncations of type IIB supergravity compactified on
squashed five-dimensional Sasaki-Einstein manifolds. We derive the lower
dimensional equations of motion and effective action, and comment on the
supersymmetry of the resulting theory, which is consistent with N=4 gauged
supergravity in $d=5$, coupled to two vector multiplets. We compute fermion
masses by linearizing around two $AdS_{5}$ vacua of the theory: one that breaks
N=4 down to N=2 spontaneously, and a second one which preserves no
supersymmetries. The truncations under consideration are noteworthy in that
they retain massive modes which are charged under a U(1) subgroup of the
$R$-symmetry, a feature that makes them interesting for applications to
condensed matter phenomena via gauge/gravity duality. In this light, as an
application of our general results we exhibit the coupling of the fermions to
the type IIB holographic superconductor, and find a consistent further
truncation of the fermion sector that retains a single spin-1/2 mode.Comment: 43 pages, 2 figures, PDFLaTeX; v2: added references, typos corrected,
  minor change
Solitonic supersymmetry restoration

Q-balls are a possible feature of any model with a conserved, global U(1)
symmetry and no massless, charged scalars. It is shown that for a broad class
of models of metastable supersymmetry breaking they are extremely influential
on the vacuum lifetime and make seemingly viable vacua catastrophically short
lived. A net charge asymmetry is not required as there is often a significant
range of parameter space where statistical fluctuations alone are sufficient.
This effect is examined for two supersymmetry breaking scenarios. It is found
that models of minimal gauge mediation (which necessarily have a messenger
number U(1)) undergo a rapid, supersymmetry restoring phase transition unless
the messenger mass is greater than 10^8 GeV. Similarly the ISS model, in the
context of direct mediation, quickly decays unless the perturbative
superpotential coupling is greater than the Standard Model gauge couplings.Comment: 17 pages, 3 figures, minor comments added, accepted for publication
  in JHE
Two-Loop Leading Color Corrections to Heavy-Quark Pair Production in the
  Gluon Fusion Channel

We evaluate the two-loop QCD diagrams contributing to the leading color
coefficient of the heavy-quark pair production cross section in the gluon
fusion channel. We obtain an analytic expression, which is valid for any value
of the Mandelstam invariants s and t and of the heavy-quark mass m. Our
findings agree with previous analytic results in the small-mass limit and with
recent results for the coefficients of the IR poles.Comment: 15 pages, 3 figures, additional files with results and numerical
  progra
Discovering the constrained NMSSM with tau leptons at the LHC

The constrained Next-to-Minimal Supersymmetric Standard Model (cNMSSM) with
mSugra-like boundary conditions at the GUT scale implies a singlino-like LSP
with a mass just a few GeV below a stau NLSP. Hence, most of the squark/gluino
decay cascades contain two tau leptons. The gluino mass >~ 1.2 TeV is somewhat
larger than the squark masses of >~ 1 TeV. We simulate signal and background
events for such a scenario at the LHC, and propose cuts on the transverse
momenta of two jets, the missing transverse energy and the transverse momentum
of a hadronically decaying tau lepton. This dedicated analysis allows to
improve on the results of generic supersymmetry searches for a large part of
the parameter space of the cNMSSM. The distribution of the effective mass and
the signal rate provide sensitivity to distinguish the cNMSSM from the
constrained Minimal Supersymmetric Standard Model in the stau-coannihilation
region.Comment: 18 pages, 3 Figure
Towards a Two-Loop Matching of Gauge Couplings in Grand Unified Theories

We calculate the two-loop matching corrections for the gauge couplings at the
Grand Unification scale in a general framework that aims at making as few
assumptions on the underlying Grand Unified Theory (GUT) as possible. In this
paper we present an intermediate result that is general enough to be applied to
the Georgi-Glashow SU(5) as a "toy model". The numerical effects in this theory
are found to be larger than the current experimental uncertainty on $alpha_s$.
Furthermore, we give many technical details regarding renormalization
procedure, tadpole terms, gauge fixing and the treatment of group theory
factors, which is useful preparative work for the extension of the calculation
to supersymmetric GUTs.Comment: 36 pages, 2 figures. V2: References added, minor additions, corrected
  typos in eqs. (41),(70) and (71), version published in JHE
On the massive gluon propagator, the PT-BFM scheme and the low-momentum
  behaviour of decoupling and scaling DSE solutions

We study the low-momentum behaviour of Yang-Mills propagators obtained from
Landau-gauge Dyson-Schwinger equations (DSE) in the PT-BFM scheme. We compare
the ghost propagator numerical results with the analytical ones obtained by
analyzing the low-momentum behaviour of the ghost propagator DSE in Landau
gauge, assuming for the truncation a constant ghost-gluon vertex and a simple
model for a massive gluon propagator. The asymptotic expression obtained for
the regular or decoupling ghost dressing function up to the order ${\cal
O}(q^2)$ is proven to fit pretty well the numerical PT-BFM results.
Furthermore, when the size of the coupling renormalized at some scale
approaches some critical value, the numerical PT-BFM propagators tend to behave
as the scaling ones. We also show that the scaling solution, implying a
diverging ghost dressing function, cannot be a DSE solution in the PT-BFM
scheme but an unattainable limiting case.Comment: 16 pages, 2 figs., 2 tabs (updated version to be published in JHEP
Flavored Orbifold GUT - an SO(10) x S4 model

Orbifold grand unified theories (GUTs) solve several problems in GUT model
building. Therefore, it is intriguing to investigate similar constructions in
the flavor context. In this paper, we propose that a flavor symmetry might
emerge due to orbifold compactification of one orbifold and broken by boundary
conditions of another orbifold. The combination of the orbifold parities in
gauge and flavor space determines the zero modes. We demonstrate the
construction in a supersymmetric (SUSY) SO(10) x S_4 orbifold GUT model, which
predicts the tribimaximal mixing at leading order in the lepton sector as well
as the Cabibbo angle in the quark sector.Comment: 19 pages, 2 figures, version as published in journal, several
  changes, model extende
Chiral dynamics with strange quarks in the light of recent lattice
  simulations

Several lattice collaborations performing simulations with 2+1 light
dynamical quarks have experienced difficulties in fitting their data with
standard Nf=3 chiral expansions at next-to-leading order, yielding low values
of the quark condensate and/or the decay constant in the Nf=3 chiral limit. A
reordering of these expansions seems required to analyse these data in a
consistent way. We discuss such a reordering, known as Resummed Chiral
Perturbation Theory, in the case of pseudoscalar masses and decay constants,
pion and kaon electromagnetic form factors and Kl3} form factors. We show that
it provides a good fit of the recent results of two lattice collaborations
(PACS-CS and RBC/UKQCD). We describe the emerging picture for the pattern of
chiral symmetry breaking, marked by a strong dependence of the observables on
the strange quark mass and thus a significant difference between chiral
symmetry breaking in the Nf=2 and Nf=3 chiral limits. We discuss the
consequences for the ratio of decay constants F_K/F_pi and the Kl3 form factor
at vanishing momentum transfer.Comment: 31 pages. Published versio
Local Spacetime Physics from the Grassmannian

A duality has recently been conjectured between all leading singularities of
n-particle N^(k-2)MHV scattering amplitudes in N=4 SYM and the residues of a
contour integral with a natural measure over the Grassmannian G(k,n). In this
note we show that a simple contour deformation converts the sum of Grassmannian
residues associated with the BCFW expansion of NMHV tree amplitudes to the CSW
expansion of the same amplitude. We propose that for general k the same
deformation yields the (k-2) parameter Risager expansion. We establish this
equivalence for all MHV-bar amplitudes and show that the Risager degrees of
freedom are non-trivially determined by the GL(k-2) "gauge" degrees of freedom
in the Grassmannian. The Risager expansion is known to recursively construct
the CSW expansion for all tree amplitudes, and given that the CSW expansion
follows directly from the (super) Yang-Mills Lagrangian in light-cone gauge,
this contour deformation allows us to directly see the emergence of local
space-time physics from the Grassmannian.Comment: 22 pages, 13 figures; v2: minor updates, typos correcte
Chiral anomalies and AdS/CMT in two dimensions

I clarify some recent confusion regarding the holographic description of
finite-density systems in two dimensions. Notably, the chiral anomaly for
symmetry currents in 2d conformal field theories (CFT) completely determines
their correlators. The important exception is a CFT with a gauge theory to
which we may couple an external current, as in the probe D3/D3 system or the
putative dual to the charged BTZ black hole. These systems are analyzed with an
eye for potential condensed matter applications.Comment: 1+25 page
Beyond Logarithmic Corrections to Cardy Formula

As shown by Cardy modular invariance of the partition function of a given
unitary non-singular 2d CFT with left and right central charges c_L and c_R,
implies that the density of states in a microcanonical ensemble, at excitations
Delta and Delta-bar and in the saddle point approximation, is
\rho_0(\Delta,\bar\Delta;c_L, c_R)=c_L c_R
\exp(2\pi\sqrt{{c_L\Delta}/{6}})\exp(2\pi\sqrt{{c_R\bar\Delta}/{6}}). In this
paper, we extend Cardy's analysis and show that in the saddle point
approximation and up to contributions which are exponentially suppressed
compared to the leading Cardy's result, the density of states takes the form
\rho(\Delta,\bar\Delta; c_L,c_R)= f(c_L\Delta)
f(c_R\bar\Delta)\rho_0(\Delta,\bar\Delta; c_L, c_R), for a function f(x) which
we specify. In particular, we show that (i) \rho (\Delta,\bar\Delta; c_L, c_R)
is the product of contributions of left and right movers and hence, to this
approximation, the partition function of any modular invariant, non-singular
unitary 2d CFT is holomorphically factorizable and (ii) \rho(\Delta,\bar\Delta;
c_L, c_R)/(c_Lc_R) is only a function of $c_R\bar\Delta$ and $c_L\Delta$. In
addition, treating \rho(\Delta,\bar\Delta; c_L, c_R) as the density of states
of a microcanonical ensemble, we compute the entropy of the system in the
canonical counterpart and show that the function f(x) is such that the
canonical entropy, up to exponentially suppressed contributions, is simply
given by the Cardy's result \ln\rho_0(\Delta,\bar\Delta; c_L, c_R).Comment: 30 pages, no figures; v2: minor improvements, one reference added,
  v3: minor corrections to match the published versio
Constraining noncommutative field theories with holography

An important window to quantum gravity phenomena in low energy noncommutative
(NC) quantum field theories (QFTs) gets represented by a specific form of UV/IR
mixing. Yet another important window to quantum gravity, a holography,
manifests itself in effective QFTs as a distinct UV/IR connection. In matching
these two principles, a useful relationship connecting the UV cutoff
$\Lambda_{\rm UV}$, the IR cutoff $\Lambda_{\rm IR}$ and the scale of
noncommutativity $\Lambda_{\rm NC}$, can be obtained. We show that an effective
QFT endowed with both principles may not be capable to fit disparate
experimental bounds simultaneously, like the muon $g-2$ and the masslessness of
the photon. Also, the constraints from the muon $g-2$ preclude any possibility
to observe the birefringence of the vacuum coming from objects at cosmological
distances. On the other hand, in NC theories without the UV completion, where
the perturbative aspect of the theory (obtained by truncating a power series in
$ \Lambda_{\rm NC}^{-2}$) becomes important, a heuristic estimate of the region
where the perturbative expansion is well-defined $E/ \Lambda_{\rm NC} \lesssim
1$, gets affected when holography is applied by providing the energy of the
system $E$ a $\Lambda_{\rm NC}$-dependent lower limit. This may affect models
which try to infer the scale $\Lambda_{\rm NC}$ by using data from low-energy
experiments.Comment: 4 pages, version to be published in JHE
Vacuum misalignment corrections to tri-bimaximal mixing and form
  dominance

Tri-bimaximal neutrino mixing may arise from see-saw models based on family
symmetry which is spontaneously broken by flavons with particular vacuum
alignments. However recent analyses hint that tri-bimaximal mixing may be
insensitive to the precise form of vacuum alignment. In this paper we derive
approximate analytic results which express the deviations from tri-bimaximal
neutrino mixing due to vacuum misalignment. We also relate vacuum misalignment
to departures from form dominance, corresponding to deviations from the real
orthogonal $R$ matrix, where such corrections are necessary to allow for
successful leptogenesis. The analytic results show that the corrections to
tri-bimaximal mixing and form dominance depend on the pattern of the vacuum
misalignment, with the two effects being uncorrelated.Comment: Published version, 29 page
Instanton Corrected Non-Supersymmetric Attractors

We discuss non-supersymmetric attractors with an instanton correction in Type
IIA string theory compactified on a Calabi-Yau three-fold at large volume. For
a stable non-supersymmetric black hole, the attractor point must minimize the
effective black hole potential. We study the supersymmetric as well as
non-supersymmetric attractors for the D0-D4 system with instanton corrections.
We show that in simple models, like the STU model, the flat directions of the
mass matrix can be lifted by a suitable choice of the instanton parameters.Comment: Minor modifications, Corrected typos, 38 pages, 1 figur
Holographic metals at finite temperature

A holographic dual description of a 2+1 dimensional system of strongly
interacting fermions at low temperature and finite charge density is given in
terms of an electron cloud suspended over the horizon of a charged black hole
in asymptotically AdS spacetime. The electron star of Hartnoll and Tavanfar is
recovered in the limit of zero temperature, while at higher temperatures the
fraction of charge carried by the electron cloud is reduced and at a critical
temperature there is a second order phase transition to a configuration with
only a charged black hole. The geometric structure implies that finite
temperature transport coefficients, including the AC electrical conductivity,
only receive contributions from bulk fermions within a finite band in the
radial direction.Comment: LaTex 16 pages, 12 figures, v2: Added reference. Error in free energy
  corrected. Phase transition to AdS-RN black brane is third order rather than
  second order as was claimed previousl