pinecone/core-2020-05-10-deduplication huggingface dataset:
Thermal properties of a string bit model at large N

We study the finite temperature properties of a recently introduced string
bit model designed to capture some features of the emergent string in the
tensionless limit. The model consists of a pair of bosonic and fermionic bit
operators transforming in the adjoint representation of the color group SU(N).
Color confinement is not achieved as a dynamical effect, but instead is
enforced by an explicit singlet projection. At large N and finite temperature,
the model has a non trivial thermodynamics. In particular, there is a Hagedorn
type transition at a finite temperature $T=T_H$ where the string degrees of
freedom are liberated and the free energy gets a large contribution $\sim
N^{2}$ that plays the role of an order parameter. For $T>T_H$, the low
temperature phase becomes unstable. In the new phase, the thermodynamically
favoured configurations are characterized by a non-trivial gapped density of
the SU(N) angles associated with the singlet projection. We present an accurate
algorithm for the determination of the density profile at $N=\infty$. In
particular, we determine the gap endpoint at generic temperature and analytical
expansions valid near the Hagedorn transition as well as at high temperature.
The leading order corrections are characterized by non-trivial exponents that
are determined analytically and compared with explicit numerical calculations.Comment: 15 pages, 8 pdf figure
The ABC (in any D) of Logarithmic CFT

Logarithmic conformal field theories have a vast range of applications, from
critical percolation to systems with quenched disorder. In this paper we
thoroughly examine the structure of these theories based on their symmetry
properties. Our analysis is model-independent and holds for any spacetime
dimension. Our results include a determination of the general form of
correlation functions and conformal block decompositions, clearing the path for
future bootstrap applications. Several examples are discussed in detail,
including logarithmic generalized free fields, holographic models,
self-avoiding random walks and critical percolation.Comment: 55 pages + appendice
Correlators in the $\mathcal{N}=2$ Supersymmetric SYK Model

We study correlation functions in the one-dimensional $\mathcal{N}=2$
supersymmetric SYK model. The leading order 4-point correlation functions are
computed by summing over ladder diagrams expanded in a suitable basis of
conformal eigenfunctions. A novelty of the $\mathcal{N}=2$ model is that both
symmetric and antisymmetric eigenfunctions are required. Although we use a
component formalism, we verify that the operator spectrum and 4-point functions
are consistent with $\mathcal{N}=2$ supersymmetry. We also confirm the
maximally chaotic behavior of this model and comment briefly on its 6-point
functions.Comment: 31 pages, 3 figures, v2: several minor typos correcte
Menagerie of AdS$\boldsymbol{_2}$ boundary conditions

We consider different sets of AdS$_2$ boundary conditions for the
Jackiw-Teitelboim model in the linear dilaton sector where the dilaton is
allowed to fluctuate to leading order at the boundary of the Poincar\'e disk.
The most general set of boundary condtions is easily motivated in the gauge
theoretic formulation as a Poisson sigma model and has an $\mathfrak{sl}(2)$
current algebra as asymptotic symmetries. Consistency of the variational
principle requires a novel boundary counterterm in the holographically
renormalized action, namely a kinetic term for the dilaton. The on-shell action
can be naturally reformulated as a Schwarzian boundary action. While there can
be at most three canonical boundary charges on an equal-time slice, we consider
all Fourier modes of these charges with respect to the Euclidean boundary time
and study their associated algebras. Besides the (centerless)
$\mathfrak{sl}(2)$ current algebra we find for stricter boundary conditions a
Virasoro algebra, a warped conformal algebra and a $\mathfrak{u}(1)$ current
algebra. In each of these cases we get one half of a corresponding symmetry
algebra in three-dimensional Einstein gravity with negative cosmological
constant and analogous boundary conditions. However, on-shell some of these
algebras reduce to finite-dimensional ones, reminiscent of the on-shell
breaking of conformal invariance in SYK. We conclude with a discussion of
thermodynamical aspects, in particular the entropy and some Cardyology.Comment: 42 pp, 5 figs, v2: added ref
Small Fermi Surfaces and Strong Correlation Effects in Dirac Materials
  with Holography

Recent discovery of transport anomaly in graphene demonstrated that a system
known to be weakly interacting may become strongly correlated if system
parameter(s) can be tuned such that fermi surface is sufficiently small. We
study the strong correlation effects in the transport coefficients of Dirac
materials doped with magnetic impurity under the magnetic field using
holographic method. The experimental data of magneto-conductivity are well fit
by our theory, however, not much data are available for other transports of
Dirac material in such regime. Therefore, our results on heat
transport,thermo-electric power and Nernst coefficients are left as predictions
of holographic theory for generic Dirac materials in the vicinity of charge
neutral point with possible surface gap. We give detailed look over each
magneto-transport observable and 3Dplots to guide future experiments.Comment: 32 pages, 24 figure
Antisplit Supersymmetry

I explore the phenomenology of Supersymmetry models in which the gauginos are
much heavier then that scalar particles of the MSSM. In these models, the
gauginos are inaccessible to colliders while the scalar spectrum is compressed.
I give several examples of models which exhibit this phenomenology built in the
class of General Gauge Mediated Models. I explore possible LSP and NLSP
candidates in these scenarios including Higgsino, stau, and sneutrino
candidates. Collider signatures for these models include multi-particle decay
chains, many taus in the final state, and possible displaced vertices with
semi-long lived sparticles. I enumerate the most likely collider smoking gun
collider signatures for each general LSP/NLSP scenario.Comment: 26 pages, 7 figures, 6 table
Non-Singular Black Holes in Massive Gravity: Time-Dependent Solutions

When starting with a static, spherically-symmetric ansatz, there are two
types of black hole solutions in dRGT massive gravity: (i) exact Schwarzschild
solutions which exhibit no Yukawa suppression at large distances and (ii)
solutions in which the dynamical metric and the reference metric are
simultaneously diagonal and which inevitably exhibit coordinate-invariant
singularities at the horizon. In this work we investigate the possibility of
black hole solutions which can accommodate both a non-singular horizon and
Yukawa asymptotics. In particular, by adopting a time-dependent ansatz, we
derive perturbative analytic solutions which possess non-singular horizons.
These black hole solutions are indistinguishable from Schwarzschild black holes
in the limit of zero graviton mass. At finite graviton mass, they depend
explicitly on time. However, we demonstrate that the location of the apparent
horizon is not necessarily time-dependent, indicating that these black holes
are not necessarily accreting or evaporating (classically). In deriving these
results, we also review and extend known results about static black hole
solutions in massive gravity.Comment: 19 pages, 2 figure
Gravitino Production Suppressed by Dynamics of Sgoldstino

In supersymmetric theories, the gravitino is abundantly produced in the early
Universe from thermal scattering, resulting in a strong upper bound on the
reheat temperature after inflation. We point out that the gravitino problem may
be absent or very mild due to the early dynamics of a supersymmetry breaking
field, i.e. a sgoldstino. In models of low scale mediation, the field value of
the sgoldstino determines the mediation scale and is in general different in
the early Universe from the present one. A large initial field value since the
era of the inflationary reheating suppresses the gravitino production
significantly. We investigate in detail the cosmological evolution of the
sgoldstino and show that the reheat temperature may be much higher than the
conventional upper bound, restoring the compatibility with thermal
leptogenesis.Comment: 23 pages, 3 figures; v2: discussions added and one figure updated,
  matches version published in JHE
Are tiny gauge couplings out of the Swampland?

There is significant evidence suggesting that continuous global symmetries
are always gauged in quantum gravity. However, very weakly gauged symmetries
seem global to an effective field theory expansion in powers of Newton's
constant. We show that, at least for Einsteinian quantum gravity on AdS, such
extremely weak gaugings are indeed in the Swampland: Consistency with AdS black
hole thermodynamics requires the bulk gauge coupling $g^2$ not to vanish faster
than $\sim\exp(\ell^{d-1}/G)$, where $\ell$ is the $AdS_{d+1}$ radius and $G$
is Newton's constant as we take the $G\rightarrow0$ limit. This translates to a
constraint in the dual large $N$ CFT, namely, that the two-point function
coefficient of the current $C_J$ cannot grow faster than $\exp(N^2)$ in the
large $N$ limit. We also recover a previously known logarithmic relationship
between the cutoff of the effective field theory in AdS, Planck's mass, and the
AdS radius.Comment: 22 page
Leading multi-soft limits from scattering equations

A Cachazo-He-Yuan (CHY) type formula is derived for the leading gluon,
bi-adjoint scalar $\phi^3$, Yang-Mills-scalar and non-linear sigma model
$m$-soft factors $S_m$ in arbitrary dimension. The general formula is used to
evaluate explicit examples for up to three soft legs analytically and up to
four soft legs numerically via comparison with amplitude ratios under soft
kinematics. A structural pattern for gluon $m$-soft factor is inferred and a
simpler formula for its calculation is conjectured. In four dimensions, a
Cachazo-Svr\v{c}ek-Witten (CSW) recursive procedure producing the leading
$m$-soft gluon factor in spinor helicity formalism is developed as an
alternative, and Britto-Cachazo-Feng-Witten (BCFW) recursion is used to obtain
the leading four-soft gluon factor for all analytically distinct helicity
configurations.Comment: 27 pages, 1 paragraph change
Dark Matter as a weakly coupled Dark Baryon

Dark Matter might be an accidentally stable baryon of a new confining gauge
interaction. We extend previous studies exploring the possibility that the DM
is made of dark quarks heavier than the dark confinement scale. The resulting
phenomenology contains new unusual elements: a two-stage DM cosmology
(freeze-out followed by dark condensation), a large DM annihilation cross
section through recombination of dark quarks (allowing to fit the positron
excess). Light dark glue-balls are relatively long lived and give extra
cosmological effects; DM itself can remain radioactive.Comment: New version published in JHE
Combining the bi-Yang-Baxter deformation, the Wess-Zumino term and TsT
  transformations in one integrable sigma-model

A multi-parameter integrable deformation of the principal chiral model is
presented. The Yang-Baxter and bi-Yang-Baxter sigma-models, the principal
chiral model plus a Wess-Zumino term and the TsT transformation of the
principal chiral model are all recovered when the appropriate deformation
parameters vanish. When the Lie group is SU(2), we show that this
four-parameter integrable deformation of the SU(2) principal chiral model
corresponds to the Lukyanov model.Comment: 20 pages, published versio
High-Precision Calculations in Strongly Coupled Quantum Field Theory
  with Next-to-Leading-Order Renormalized Hamiltonian Truncation

Hamiltonian Truncation (a.k.a. Truncated Spectrum Approach) is an efficient
numerical technique to solve strongly coupled QFTs in d=2 spacetime dimensions.
Further theoretical developments are needed to increase its accuracy and the
range of applicability. With this goal in mind, here we present a new variant
of Hamiltonian Truncation which exhibits smaller dependence on the UV cutoff
than other existing implementations, and yields more accurate spectra. The key
idea for achieving this consists in integrating out exactly a certain class of
high energy states, which corresponds to performing renormalization at the
cubic order in the interaction strength. We test the new method on the strongly
coupled two-dimensional quartic scalar theory. Our work will also be useful for
the future goal of extending Hamiltonian Truncation to higher dimensions d >=
3.Comment: 8 pages, 4 figures; v2: published versio
Gauge Five-brane Solutions of Co-dimension Two in Heterotic Supergravity

We continue to study the BPS gauge five-brane solutions of codimension two in
ten-dimensional heterotic supergravity. The geometry including the dilaton and
the NS-NS $B$-field are sourced from the monopole chain in $\mathbb{R}^2 \times
S^1$. We find that the geometry is asymptotically Ricci flat and the dilaton is
no longer imaginary valued. These properties are contrasted with the smeared
counterpart discussed in our previous paper. We perform the T-duality
transformations of the solution and find that it never results in a
non-geometric object.Comment: 24 pages, 4 figures, typos corrected, version published in JHE
Connecting the ambitwistor and the sectorized heterotic strings

The sectorized description of the (chiral) heterotic string using pure
spinors has been misleadingly viewed as an infinite tension string. One
evidence for this fact comes from the tree level 3-point graviton amplitude,
which we show to contain the usual Einstein term plus a higher curvature
contribution. After reintroducing a dimensionful parameter $\ell$ in the
theory, we demonstrate that the heterotic model is in fact two-fold, depending
on the choice of the supersymmetric sector, and that the spectrum also contains
one massive (open string like) multiplet. By taking the $\ell\to\infty$ limit,
we finally show that the ambitwistor string is recovered, reproducing the
unexpected heterotic state in Mason and Skinner's RNS description.Comment: 30 pages, one figure. Clarifications and references added. Published
  versio
A systematic construction of microstate geometries with low angular
  momentum

We outline a systematic procedure to obtain horizonless microstate geometries
that have the same charges as three-charge five-dimensional black holes with a
macroscopically-large horizon area and an arbitrarily-small angular momentum.
There are two routes through which such solutions can be constructed: using
multi-center Gibbons-Hawking (GH) spaces or using superstratum technology. So
far the only solutions corresponding to microstate geometries for black holes
with no angular momentum have been obtained via superstrata, and multi-center
Gibbons-Hawking spaces have been believed to give rise only to microstate
geometries of BMPV black holes with a large angular momentum. We perform a
thorough search throughout the parameter space of smooth horizonless solutions
with four GH centers and find that these have an angular momentum that is
generally larger than 80% of the cosmic censorship bound. However, we find that
solutions with three GH centers and one supertube (which are smooth in
six-dimensional supergravity) can have an arbitrarily-low angular momentum. Our
construction thus gives a recipe to build large classes of microstate
geometries for zero-angular-momentum black holes without resorting to
superstratum technology.Comment: 36 pages, 23 figure
Ten-dimensional lifts of global supersymmetry on curved spaces

Admissible curved space backgrounds for four-dimensional supersymmetric field
theories are determined by solving Killing spinor equations of four-dimensional
off-shell supergravities. These can be obtained by combining ten-dimensional
type IIB supersymmetry with D-brane kappa-symmetry and identifying auxiliary
fields of the four-dimensional supergravity fields in terms of type IIB fields.
In this paper we show how to extend a number of solutions of four-dimensional
Killing spinor equations with four or less supercharges to solutions of the
ten-dimensional supersymmetry constraints.Comment: 31 page
Emergent Dark Matter in Late Time Universe on Holographic Screen

We discuss a scenario that the dark matter in late time universe emerges as
part of the holographic stress-energy tensor on the hypersurface in higher
dimensional flat spacetime. Firstly we construct a toy model with a de Sitter
hypersurface as the holographic screen in the flat bulk. After adding the
baryonic matter on the screen, we assume that both of the dark matter and dark
energy can be described by the Brown-York stress-energy tensor. From the
Hamiltonian constraint equation in the flat bulk, we find an interesting
relation between the dark matter and baryonic matter's energy density
parameters, by comparing with the Lambda cold dark matter parameterization. We
further compare this holographic embedding of emergent dark matter with
traditional braneworld scenario and present an alternative interpretation as
the holographic universe. It can be reduced to our toy constraint in the late
time universe, with the new parameterization of the Friedmann equation. We also
comment on the possible connection with Verlinde's emergent gravity, where the
dark matter is treated as the elastic response of the baryonic matter on the de
Sitter spacetime background. We show that from the holographic de Sitter model
with elasticity, the Tully-Fisher relation and the dark matter distribution in
the galaxy scale can be derived.Comment: 28 pages, 2 figures; Matches published version and we thank the
  referees for many insightful comments; v3: typos in the Friedmann equations
  are fixe
Supersymmetry Breaking by Fluxes

Type II string theory and M-theory admit flux configurations that break
supersymmetry below the Kaluza-Klein scale. These backgrounds play a central
role in most models of the string landscape. I argue that the behavior of such
backgrounds at weak coupling is generically a rolling solution, not a static
space-time. Quantum corrections to the space-time potential are computed around
this classical time-dependent background. This is particularly important for
non-perturbative corrections. This change in perspective offers an explanation
for why there appear to be many effective field theory models that seemingly
evade the known no-go theorems forbidding de Sitter space-times. This has
interesting implications for type IIB string landscape models.Comment: 31 pages; LaTeX; references added; minor changes and more references
  adde
Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the H → aa → 4b channel in pp collisions at s√=13 TeV with the ATLAS detector

A search for exotic decays of the Higgs boson into a pair of spin-zero particles, H → aa, where the a-boson decay sin to b-quarks promptly or with a mean proper lifetime cτa up to 6 mm and has a mass in the range of 20–60 GeV, is presented. The search is performed in events where the Higgs boson is produced in association with a W or Z boson, giving rise to a signature of one or two charged leptons (electrons or muons) and multiple jets from b-quark decays. The analysis is based on the dataset of proton-proton collisions at s√=13 TeV recorded in 2015 and 2016 by the ATLAS detector at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 36.1 fb−1. No significant excess of events above the Standard Model background prediction is observed, and 95% confidence-level upper limits are derived for the production cross-sections for pp → WH, ZH and their combination, times the branching ratio of the decay chain H → aa → 4b. For a-bosons which decay promptly, the upper limit on the combination of cross-sections for WH and ZH times the branching ratio of H → aa → 4b ranges from 3.0 pb for ma = 20 GeV to 1.3 pb for ma = 60 GeV, assuming that the ratio of WH to ZH cross-sections follows the Standard Model prediction. For a-bosons with longer proper lifetimes, the most stringent limits are 1.8 pb and 0.68 pb, respectively, at cτa ∼ 0.4 mm
The large D black hole dynamics in AdS/dS backgrounds

We have constructed a class of perturbative dynamical black hole solutions in
presence of cosmological constant. We have done our calculation in large number
of dimensions. The inverse power of dimension has been used as the perturbation
parameter and our calculation is valid upto the first subleading order. The
solutions are in one to one correspondence with a dynamical membrane and a
velocity field embedded in the asymptotic geometry. Our method is manifestly
covariant with respect to the asymptotic geometry. One single calculation and
the same universal result works for both dS and AdS geometry or in case of AdS
for both global AdS and Poincare patch. We have checked our final answer with
various known exact solutions and the known spectrum of Quasi Normal modes in
AdS/dS.Comment: 74 pages. v2: Minor changes, typos correcte
The Light Radion Window

Inspired by the Contino-Pomarol-Rattazzi mechanism we explore scenarios with
a very light (100 keV to 10 GeV) radion which could be associated with the
suppression of the electroweak contribution to vacuum energy. We construct
explicit, realistic models that realize this mechanism and explore the
phenomenological constraints on this class of models. Compared with axion-like
particles in this mass range, the bounds from SN 1987a and from cosmology can
be much weaker, depending on the the mass of the radion and its coupling to
other particles. With couplings suppressed by a scale lower than 100 TeV much
of the mass window from 100 keV to 10 GeV is still open.Comment: 30 pages, 12 figures, published version, software for figure uploade
Effective Field Theory for Dark Matter Direct Detection up to Dimension
  Seven

We present the full basis of effective operators relevant for dark matter
direct detection, up to and including operators of mass dimension seven. We
treat the cases where dark matter is either a Dirac fermion, a Majorana
fermion, a complex scalar, or a real scalar, allowing for dark matter to
furnish a general representation of the electroweak gauge group. We describe
the algorithmic procedure used to obtain the minimal set of effective operators
and provide the tree-level matching conditions onto the effective theory valid
below the electroweak scale.Comment: 30 pages, 1 figur
AdS5 black strings in the stu model of FI-gauged N = 2 supergravity

We analytically construct asymptotically AdS5 black string solutions starting from the four-dimensional domain wall black hole of [1]. It is shown that its uplift gives a black string in d = 5 minimal gauged supergravity, with momentum along the string. Applying instead the residual symmetries of N = 2, d = 4 Fayet-Iliopoulos-gauged super-gravity discovered in [2] to the domain wall seed leads, after uplifting, to a dyonic black string that interpolates between AdS5 and AdS3 × H2 at the horizon. A Kaluza-Klein reduction of the latter along an angular Killing direction ϕ followed by a duality transformation yields, after going back to five dimensions, a black string with both momentum along the string and rotation along ϕ. This is the first instance of using solution-generating techniques in gauged supergravity to add rotation to a given seed. These solutions all have constant scalar fields. As was shown in [3], the construction of supersymmetric static magnetic black strings in the FI-gauged stu model amounts to solving the SO(2, 1) spinning top equations, which descend from an inhomogeneous version of the Nahm equations. We are able to solve these in a particular case, which leads to a generalization of the Maldacena-Nuñez solution