pinecone/core-2020-05-10-deduplication huggingface dataset:
Ward identities and relations between conductivities and viscosities in
  holography

We derive relations between viscosities and momentum conductivity in $2+1$
dimensions by finding a generalization of holographic Ward identities for the
energy-momentum tensor. The generalization is novel in the sense that it goes
beyond the usual identities obtained from holographic renormalization. Our
results are consistent with previous field theory analysis. The main tools we
use are a constant `probability current' in the gravity dual, that we are able
to define for any system of linear ODEs, and parity symmetry.Comment: 38 pages, to be published in JHE
From $r$-Spin Intersection Numbers to Hodge Integrals

Generalized Kontsevich Matrix Model (GKMM) with a certain given potential is
the partition function of $r$-spin intersection numbers. We represent this GKMM
in terms of fermions and expand it in terms of the Schur polynomials by
boson-fermion correspondence, and link it with a Hurwitz partition function and
a Hodge partition by operators in a $\widehat{GL}(\infty)$ group. Then, from a
$W_{1+\infty}$ constraint of the partition function of $r$-spin intersection
numbers, we get a $W_{1+\infty}$ constraint for the Hodge partition function.
The $W_{1+\infty}$ constraint completely determines the Schur polynomials
expansion of the Hodge partition function.Comment: 51 pages, 1 figur
Dynamical stability of the Holographic System with Two Competing Orders

We investigate the dynamical stability of the holographic system with two
order parameters, which exhibits competition and coexistence of condensations.
In the linear regime, we have developed the gauge dependent formalism to
calculate the quasi-normal modes by gauge fixing, which turns out be
considerably convenient. Furthermore, by giving different Gaussian wave packets
as perturbations at the initial time, we numerically evolve the full nonlinear
system until it arrives at the final equilibrium state. Our results show that
the dynamical stability is consistent with the thermodynamical stability.
Interestingly, the dynamical evolution, as well as the quasi-normal modes,
shows that the relaxation time of this model is generically much longer than
the simplest holographic system. We also find that the late time behavior can
be well captured by the lowest lying quasi-normal modes except for the
non-vanishing order towards the single ordered phase. To our knowledge, this
exception is the first counter example to the general belief that the late time
behavior towards a final stable state can be captured by the lowest lying
quasi-normal modes. In particular, a double relation is found for this
exception in certain cases.Comment: 19 pages, 15 figures; v2: minor correction
A Problem With delta-functions: Stress-Energy Constraints on Bulk-Brane
  Matching (with comments on arXiv:1508.01124)

We critically assess a recent assertion (arXiv:1508.01124) concerning using
delta-functions to analyze how higher-codimension branes back-react on their
environment. We also briefly summarize the state of the art: describing how
stress-energy balance dictates the components of off-brane stress energy in
terms brane tension; how this can modify the standard tension/defect-angle
relation for codimension-two sources when dilatons are present; and how it all
relates to extra-dimensional searches for a small cosmological constant.Comment: 8 pages + appendi
Limits on Neutrinophilic Two-Higgs-Doublet Models from Flavor Physics

We derive stringent limits on neutrinophilic two-Higgs-doublet models from
low-energy observables after the discovery of the Higgs boson and of the mixing
angle $\theta_{13}$. These decays can constrain the plane spanned by
$m_{H^\pm}$, the mass of the new charged Higgs, and $v_2$, the vacuum
expectation value of the new neutrinophilic scalar doublet. Lepton flavor
conserving decays are not able to set meaningful bounds, since they depend
strongly on the unknown neutrino absolute mass scale. On the other hand, loop
induced lepton flavor violating decays, such as $\mu \to e \gamma$, $\mu \to 3
e $ or $\mu \to e$ in nuclei are currently responsable for the best limits
today. If $v_2 \lesssim 1 \, (0.1)$ eV we get $m_{H^\pm} \gtrsim 250 \, (2500)$
GeV at 90% CL. In the foreseen future these limits can improve by at least a
factor of 100.Comment: 15 pages, 5 figures, references and comments added, conclusions
  unchanged, matches version to appear in JHE
Induced Gravity I: Real Scalar Field

We show that classically scale invariant gravity coupled to a single scalar
field can undergo dimensional transmutation and generate an effective
Einstein-Hilbert action for gravity, coupled to a massive dilaton. The same
theory has an ultraviolet fixed point for coupling constant ratios such that
all couplings are asymptotically free. However the catchment basin of this
fixed point does not include regions of coupling constant parameter space
compatible with locally stable dimensional transmutation. In a companion paper
we will explore whether this more desirable outcome does obtain in more
complicated theories with non-Abelian gauge interactions.Comment: 17 pages, 3 figures. v2, additional references; slight changes in
  wordng; no changes in results. v3, additional reference
Spectral Sum Rules and Magneto-Roton as Emergent Graviton in Fractional
  Quantum Hall Effect

We consider gapped fractional quantum Hall states on the lowest Landau level
when the Coulomb energy is much smaller than the cyclotron energy. We introduce
two spectral densities, \rho_T(\omega) and \bar \rho_T(\omega), which are
proportional to the probabilities of absorption of circularly polarized
gravitons by the quantum Hall system. We prove three sum rules relating these
spectral densities with the shift S, the q^4 coefficient of the static
structure factor S_4, and the high-frequency shear modulus of the ground state
\mu_\infty, which is precisely defined. We confirm an inequality, first
suggested by Haldane, that S_4 is bounded from below by |S-1|/8. The Laughlin
wavefunction saturates this bound, which we argue to imply that systems with
ground state wavefunctions close to Laughlin's absorb gravitons of
predominantly one circular polarization. We consider a nonlinear model where
the sum rules are saturated by a single magneto-roton mode. In this model, the
magneto-roton arises from the mixing between oscillations of an internal metric
and the hydrodynamic motion. Implications for experiments are briefly
discussed.Comment: 17 pages, 2 figure
Tachyon field theory description of (thermo)dynamics in dS space

In this work, we present a few pieces of evidence in support of a possible
connection of the gravitational theory in dS space to the worldvolume theory of
unstable D-branes. We show that the action describing the geodesic motion of a
massive particle (or point-like object) in static dS space turns out to be the
same as that of the tachyon field theory for an unstable particle. The motion
along the radial direction from the origin, a locally Minkowski spacetime, to
the horizon, a locally Rindler space times a sphere, represents just the
tachyon condensation process, therefore providing a geometric picture of
tachyon condensation. We further study a scalar in global or flat dS and the
tachyon fluctuations in a homogeneous tachyon background, representing either
the full or half S-brane, on unstable D-branes and find that certain dynamics
of the dS universe corresponds to that of the homogeneous full or half S-brane.
The thermal temperature of tachyon radiation is found to agree with that felt
by any timelike observer in dS space. In string theory context, this
temperature is just the Hagedorn one, signaling a phase transition to closed
strings. An understanding of this transition in the bulk dS space is also
given.Comment: 25 pages, minor corrections, two references adde
Bootstrapping ${\mathcal N}=2$ chiral correlators

We apply the numerical bootstrap program to chiral operators in
four-dimensional ${\mathcal N}=2$ SCFTs. In the first part of this work we
study four-point functions in which all fields have the same conformal
dimension. We give special emphasis to bootstrapping a specific theory: the
simplest Argyres-Douglas fixed point with no flavor symmetry. In the second
part we generalize our setup and consider correlators of fields with unequal
dimension. This is an example of a mixed correlator and allows us to probe new
regions in the parameter space of ${\mathcal N}=2$ SCFTs. In particular, our
results put constraints on relations in the Coulomb branch chiral ring and on
the curvature of the Zamolodchikov metric.Comment: 35 pages (26 pages plus three appendices), 13 figures; v2: minor
  typos corrected, citations adde
OPTIMASS: A Package for the Minimization of Kinematic Mass Functions
  with Constraints

Reconstructed mass variables, such as $M_2$, $M_{2C}$, $M_T^\star$, and
$M_{T2}^W$, play an essential role in searches for new physics at hadron
colliders. The calculation of these variables generally involves constrained
minimization in a large parameter space, which is numerically challenging. We
provide a C++ code, OPTIMASS, which interfaces with the MINUIT library to
perform this constrained minimization using the Augmented Lagrangian Method.
The code can be applied to arbitrarily general event topologies and thus allows
the user to significantly extend the existing set of kinematic variables. We
describe this code and its physics motivation, and demonstrate its use in the
analysis of the fully leptonic decay of pair-produced top quarks using the
$M_2$ variables.Comment: 39 pages, 12 figures, (1) minor revision in section 3, (2) figure
  added in section 4.3, (3) reference added and (4) matched with published
  versio
Instanton induced Yukawa couplings from distant E3 and E(-1) instantons

We calculate non-perturbative contributions to Yukawa couplings on D3-branes
at orbifold singularities due to E3 and fractional E(-1) instantons which do
not intersect the visible sector branes. While distant E3 instantons on bulk
cycles typically contribute to Yukawa couplings, we find that distant
fractional E(-1) can also give rise to new Yukawa couplings. However,
fractional E(-1) instantons only induce Yukawa couplings if they are located at
a singularity which shares a collapsed homologous two-cycle with the
singularity supporting the visible sector. The non-perturbative contributions
to Yukawa couplings exhibit a different flavour structure than the tree-level
Yukawa couplings and, as a result, they can be sources of flavour violation.
This is particularly relevant for schemes of moduli stabilisation which rely on
superpotential contributions from E3 instantons, such as KKLT or the Large
Volume Scenario. As a byproduct of our analysis, we shed some new light on the
properties of annulus diagrams with matter field insertions in stringy
instanton calculus.Comment: 41 pages, 2 figures; v2: references adde
Strong-coupling scales and the graph structure of multi-gravity theories

In this paper we consider how the strong-coupling scale, or perturbative
cutoff, in a multi-gravity theory depends upon the presence and structure of
interactions between the different fields. This can elegantly be rephrased in
terms of the size and structure of the `theory graph' which depicts the
interactions in a given theory. We show that the question can be answered in
terms of the properties of various graph-theoretical matrices, affording an
efficient way to estimate and place bounds on the strong-coupling scale of a
given theory. In light of this we also consider the problem of relating a given
theory graph to a discretised higher dimensional theory, a la dimensional
deconstruction.Comment: 23 pages, 7 figures; v2: additional references included, and minor
  typos corrected; version published in JHE
ATLAS on-Z Excess via gluino-Higgsino-singlino decay chains in the NMSSM

Recently the ATLAS experiment has reported 3.0 sigma excess in an on-Z signal
region in searches for supersymmetric particles. We find that the
next-to-minimal supersymmetric standard model can explain this excess by the
production of gluinos which mainly decay via $\tilde{g} \to g
\tilde{\chi}^0_{2,3} \to g Z \tilde{\chi}^0_{1}$ where $\tilde{\chi}^0_{2,3}$
and $\tilde{\chi}^0_1$ are the Higgsino and the singlino-like neutralinos,
respectively. We show that the observed dark matter density is explained by the
thermal relic density of the singlino-like neutralino, simultaneously. We also
discuss the searches for the Higgs sector of this scenario at the Large Hadron
Collider.Comment: 16 pages, 2 figures, 1 tabl
Renormalization-Scale Uncertainty in the Decay Rate of False Vacuum

We study radiative corrections to the decay rate of false vacua, paying
particular attention to the renormalization-scale dependence of the decay rate.
The decay rate exponentially depends on the bounce action. The bounce action
itself is renormalization scale dependent. To make the decay rate
scale-independent, radiative corrections, which are due to the field
fluctuations around the bounce, have to be included. We show quantitatively
that the inclusion of the fluctuations suppresses the scale dependence, and
hence is important for the precise calculation of the decay rate. We also apply
our analysis to a supersymmetric model and show that the radiative corrections
are important for the Higgs-stau system with charge breaking minima.Comment: 15 pages, 2 figures; added reference
Contact interactions between particle worldlines

We construct contact interactions for bosonic and fermionic point particles.
We first relate the resulting theories to classical electrostatics by taking
functional averages over worldlines whose endpoints are fixed to charged
particles. Counting those paths which pass through a space-time point $x^{\mu}$
gives the static electric field at that point, provided we take the limit where
the length measured along the worldlines is large. We also investigate
corrections to the classical field that arise beyond leading order in this
limit before constructing a theory of point particles that interact when their
worldlines intersect. We quantise this theory and show that the partition
function contains propagator couplings between the endpoints of the particles
before discussing how this is related to the worldline formalism of quantum
field theory and general action at a distance theories.Comment: 48 pages. 4 figures. Version accepted to JHE
The QCD axion, precisely

We show how several properties of the QCD axion can be extracted at high
precision using only first principle QCD computations. By combining NLO results
obtained in chiral perturbation theory with recent Lattice QCD results the full
axion potential, its mass and the coupling to photons can be reconstructed with
percent precision. Axion couplings to nucleons can also be derived reliably,
with uncertainties smaller than ten percent. The approach presented here allows
the precision to be further improved as uncertainties on the light quark masses
and the effective theory couplings are reduced. We also compute the finite
temperature dependence of the axion potential and its mass up to the crossover
region. For higher temperature we point out the unreliability of the
conventional instanton approach and study its impact on the computation of the
axion relic abundance.Comment: 38 pages, 6 figures. v2: Discussion in sec. 2.4 simplified, fig.6
  corrected, published versio
Linear inflation from quartic potential

We show that if the inflaton has a non-minimal coupling to gravity and the
Planck scale is dynamically generated, the results of Coleman-Weinberg
inflation are confined in between two attractor solutions: quadratic inflation,
which is ruled out by the recent measurements, and linear inflation which,
instead, is in the experimental allowed region. The minimal scenario has only
one free parameter -- the inflaton's non-minimal coupling to gravity -- that
determines all physical parameters such as the tensor-to-scalar ratio and the
reheating temperature of the Universe. Should the more precise future
measurements of inflationary parameters point towards linear inflation, further
interest in scale-invariant scenarios would be motivated.Comment: 19 pages, 7 figures, revised version published on JHE
Fermionic extensions of the Standard Model in light of the Higgs
  couplings

As the Higgs boson properties settle, the constraints on the Standard Model
extensions tighten. We consider all possible new fermions that can couple to
the Higgs, inspecting sets of up to four chiral multiplets. We confront them
with direct collider searches, electroweak precision tests, and current
knowledge of the Higgs couplings. The focus is on scenarios that may depart
from the decoupling limit of very large masses and vanishing mixing, as they
offer the best prospects for detection. We identify exotic chiral families that
may receive a mass from the Higgs only, still in agreement with the
$h\gamma\gamma$ signal strength. A mixing $\theta$ between the Standard Model
and non-chiral fermions induces order $\theta^2$ deviations in the Higgs
couplings. The mixing can be as large as $\theta\sim 0.5$ in case of custodial
protection of the $Z$ couplings or accidental cancellation in the oblique
parameters. We also notice some intriguing effects for much smaller values of
$\theta$, especially in the lepton sector. Our survey includes a number of
unconventional pairs of vector-like and Majorana fermions coupled through the
Higgs, that may induce order one corrections to the Higgs radiative couplings.
We single out the regions of parameters where $h\gamma\gamma$ and $hgg$ are
unaffected, while the $h\gamma Z$ signal strength is significantly modified,
turning a few times larger than in the Standard Model in two cases. The second
run of the LHC will effectively test most of these scenarios.Comment: v2: a few clarifications and references added, improved treatment of
  the constraint from Z-b-bbar, Higgs couplings updated by using the combined
  ATLAS+CMS fi
The Spectra of Type IIB Flux Compactifications at Large Complex
  Structure

We compute the spectra of the Hessian matrix, ${\cal H}$, and the matrix
${\cal M}$ that governs the critical point equation of the low-energy effective
supergravity, as a function of the complex structure and axio-dilaton moduli
space in type IIB flux compactifications at large complex structure. We find
both spectra analytically in an $h^{1,2}_-+3$ real-dimensional subspace of the
moduli space, and show that they exhibit a universal structure with highly
degenerate eigenvalues, independently of the choice of flux, the details of the
compactification geometry, and the number of complex structure moduli. In this
subspace, the spectrum of the Hessian matrix contains no tachyons, but there
are also no critical points. We show numerically that the spectra of ${\cal H}$
and ${\cal M}$ remain highly peaked over a large fraction of the sampled moduli
space of explicit Calabi-Yau compactifications with 2 to 5 complex structure
moduli. In these models, the scale of the supersymmetric contribution to the
scalar masses is strongly linearly correlated with the value of the
superpotential over almost the entire moduli space, with particularly strong
correlations arising for $g_s < 1$. We contrast these results with the
expectations from the much-used continuous flux approximation, and comment on
the applicability of Random Matrix Theory to the statistical modelling of the
string theory landscape.Comment: 42 pages, 9 figure
Exotic Decays of Heavy B quarks

Heavy vector-like quarks of charge $-1/3$, $B$, have been searched for at the
LHC through the decays $B\rightarrow bZ,\, bh,\,tW$. In models where the $B$
quark also carries charge under a new gauge group, new decay channels may
dominate. We focus on the case where the $B$ is charged under a $U(1)^\prime$
and describe simple models where the dominant decay mode is $B\rightarrow
bZ^\prime\rightarrow b (b\bar{b})$. With the inclusion of dark matter such
models can explain the excess of gamma rays from the Galactic center. We
develop a search strategy for this decay chain and estimate that with
integrated luminosity of 300 fb$^{-1}$ the LHC will have the potential to
discover both the $B$ and the $Z'$ for $B$ quarks with mass below $\sim 1.6$
TeV, for a broad range of $Z'$ masses. A high-luminosity run can extend this
reach to $2$ TeV.Comment: 28 pages, 10 figures, 3 table
Intersecting Branes, SUSY Breaking and the 2TeV Excess at the LHC

Intersecting D-brane models in string theory can naturally support the gauge
and matter content of left-right symmetric extensions of the Standard Model
with gauge symmetry SU(3)_c x SU(2)_L x SU(2)_R x U(1)_{B-L}. Considering such
models as candidates for explaining the 2TeV excesses seen in Run-1 by both
ATLAS and CMS, the minimal possible scale of supersymmetry breaking is
determined by the requirement of precise one-loop gauge coupling unification.
For the vector-like, bifundamental and (anti-)symmetric Higgs content of such
brane configurations, this comes out fairly universally at around 19TeV. For
the SU(2)_R gauge coupling one finds values 0.48<g_R(M_R)<0.6. Threshold
corrections can potentially lower the scale of supersymmetry breaking.Comment: 17 pages, 4 figures, v2: note added, refs adde
Schur Indices, BPS Particles, and Argyres-Douglas Theories

We conjecture a precise relationship between the Schur limit of the
superconformal index of four-dimensional $\mathcal{N}=2$ field theories, which
counts local operators, and the spectrum of BPS particles on the Coulomb
branch. We verify this conjecture for the special case of free field theories,
$\mathcal{N}=2$ QED, and $SU(2)$ gauge theory coupled to fundamental matter.
Assuming the validity of our proposal, we compute the Schur index of all
Argyres-Douglas theories. Our answers match expectations from the connection of
Schur operators with two-dimensional chiral algebras. Based on our results we
propose that the chiral algebra of the generalized Argyres-Douglas theory
$(A_{k-1},A_{N-1})$ with $k$ and $N$ coprime, is the vacuum sector of the
$(k,k+N)$ $W_{k}$ minimal model, and that the Schur index is the associated
vacuum character.Comment: 46 pages, 12 figures. v2: revisions to section 1, references adde
${\cal N} = 1$ Euler Anomaly Flow from Dilaton Effective Action

We consider ${\cal N} =1$ supersymmetric gauge theories in the conformal
window. The running of the gauge coupling is absorbed into the metric by
applying a suitable matter superfield- and Weyl-transformation. The computation
becomes equivalent to one of a free theory in a curved background carrying the
information of the renormalisation group flow. We use the techniques of
conformal anomaly matching and dilaton effective action, by Komargodski and
Schwimmer, to rederive the difference of the Euler anomaly coefficient $\Delta
a \equiv a_{\rm UV} - a_{\rm IR} $ for the ${\cal N} =1$ theory. The structure
of $\Delta a $ is therefore in one-to-one correspondence with the Wess-Zumino
dilaton action.Comment: 10 pp, no figure
Supersymmetric Renyi Entropy in $CFT_2$ and $AdS_3$

We show that in any two dimensional conformal field theory with (2, 2)
supersymmetry one can define a supersymmetric analog of the usual Renyi entropy
of a spatial region A. It differs from the Renyi entropy by a universal
function (which we compute) of the central charge, Renyi parameter n and the
geometric parameters of A. In the limit $n \to1$ it coincides with the
entanglement entropy. Thus, it contains the same information as the Renyi
entropy but its computation only involves correlation functions of chiral and
anti-chiral operators. We also show that this quantity appears naturally in
string theory on $AdS_3$.Comment: 15 pages; v2: reference adde