pinecone/core-2020-05-10-deduplication huggingface dataset:
Resonance enhancement of dark matter interactions: the case for early
  kinetic decoupling and velocity dependent resonance width

Motivated by the possibility of enhancing dark matter (DM) self-interaction
cross-section $\sigma_{\rm self}$, we have revisited the issue of DM
annihilation through a Breit-Wigner resonance. In this case thermally averaged
annihilation cross-section has strong temperature dependence, whereas elastic
scattering of DM on the thermal bath particles is suppressed. This leads to the
early kinetic decoupling of DM and an interesting interplay in the evolution of
DM density and temperature that can be described by a set of coupled Boltzmann
equations. The standard Breit-Wigner parametrization of a resonance propagator
is also corrected by including momentum dependence of the resonance width. It
has been shown that this effects may change predictions of DM relic density by
more than order of magnitude in some regions of the parameter space. Model
independent discussion is illustrated within a theory of Abelian vector dark
matter. The model assumes extra $U(1)$ symmetry group factor and an additional
complex Higgs field needed to generate a mass for the dark vector boson, which
provides an extra neutral Higgs boson $h_2$. We discuss the resonance
amplification of $\sigma_{\rm self}$. It turns out that if DM abundance is
properly reproduced, the Fermi-LAT data favor heavy DM and constraint the
enhancement of $\sigma_{\rm self}$ to the range, which cannot provide a
solution to the small-scale structure problems.}Comment: 17 pages, 5 figures, v2: minor changes in text, BBN and CMB
  constraints adde
Well-tempered n-plet dark matter

We study simple effective models of fermionic WIMP dark matter, where the
dark matter candidate is a mixture of a Standard Model singlet and an n-plet of
SU(2) with n >= 3, stabilized by a discrete symmetry. The dark matter mass is
assumed to be around the electroweak scale, and the mixing is generated by
higher-dimensional operators, with a cutoff scale > 1 TeV. For appropriate
values of the mass parameters and the mixing we find that the observed dark
matter relic density can be generated by coannihilation. Direct detection
experiments have already excluded large parts of the parameter space, and the
next-generation experiments will further constrain these models.Comment: 25 pages, 7 figures; v2: references and plots updated, minor
  corrections, conclusions unchange
PeV scale Supersymmetry breaking and the IceCube neutrino flux

The observation of very high energy neutrino events at IceCube has grasped a
lot of attention in the fields of both astrophysics and particle physics. It
has been speculated that these high energy neutrinos might originate either
from purely conventional astrophysical sources or from the late decay of a
super heavy (PeV scale) dark matter (DM) particle. In order for decaying DM to
be a dominant source of the IceCube high-energy neutrinos, it would require an
unusually suppressed value of the coupling of DM to neutrinos. We attempt to
explain this small coupling in the context of an $R$-parity conserving minimal
supergravity model which has right-handed neutrino superfields. With the main
assumptions of super-partner masses at the PeV scale and also a reheating
temperature not much larger than the PeV scale, we find in our model several
natural order-of-magnitude "miracles", (i) the gravitino is produced via
freeze-in as a DM candidate with the correct relic density (ii) the
right-handed (RH) sneutrino makes up only a tiny fraction ($10^{-6})$, of the
present day energy density of the universe, yet its decay lifetime to the
gravitino and neutrinos is such that it naturally predicts the right
order-of-magnitude for the IceCube neutrino flux. The long lifetime of the RH
sneutrino is explained by the existence of a global $R$-symmetry which is only
broken due to supersymmetry breaking effects. Our model also predicts a flux of
100 TeV gamma rays from the decaying RH sneutrino which are within the current
observational constraints.Comment: v2: 34 pages, 6 figures, Journal version (published in JHEP
Evolution of Holographic Fermi Arcs from a Mott Insulator

We study fermions in an electrically-probed and asymptotically anti-de Sitter
Schwarzschild spacetime which interact via novel chiral symmetry-preserving
interactions. Computing the dual fermion two-point correlator, we show that
these bulk interactions anisotropically gap Fermi surfaces of the boundary
spectrum. Consequently, the interactions we devise provide holographic models
for Fermi arcs seen ubiquitously in the pseudogap regime of the cuprates. Our
interactions are modifications of the chiral symmetry-breaking Pauli coupling,
which has previously been proposed as the holographic realization of Mott
physics. The onset of Mott insulation and pseudogap physics are respectively
discussed in the context of bulk chiral and boundary parity symmetry breaking,
and the Mott transition is interpreted as a deconfinement transition of
non-Fermi liquid excitations.Comment: 8 pages, 2 figure
Type II defects revisited.

Energy and momentum conservation in the context of a type II, purely transmitting, defect, within a single scalar relativistic two-dimensional field theory, places a severe constraint not only on the nature of the defect but also on the potentials for the scalar fields to either side of it. The constraint is of an unfamiliar type since it requires the Poisson Bracket of the defect contributions to energy and momentum with respect to the defect discontinuity and its conjugate to be balanced by the potential difference across the defect. It is shown that the only solutions to the constraint correspond to the known integrable field theories
Model independent evaluation of the Wilson coefficient of the Weinberg
  operator in QCD

We derive a Wilson coefficient of a CP-violating purely gluonic dimension-6
operator called the Weinberg operator ($GG\tilde{G}$) generated by a scalar and
two fermions at the two-loop level. We do not specify the representation of
SU(3)$_c$ for the scalar and the fermions, and thus our result can be applied
to a variety of models beyond the standard model. We estimate the nucleon EDMs
induced by the Weinberg operator in some examples and discuss the importance of
measuring EDMs. It is found that future measurements of the EDMs can probe
physics at higher energy scale beyond the reach of collider experiments.Comment: 22 pages, 7 figures; v2: version accepted by JHEP; v3: Eq. (4.2) is
  added, Table 1 is extende
On the physical process first law for dynamical black holes

Physical process version of the first law of black hole mechanics relates the
change in entropy of a perturbed Killing horizon, between two asymptotic cross
sections, to the matter flow into the horizon. Here, we study the mathematical
structure of the physical process first law for a general diffeomorphism
invariant theory of gravity. We analyze the effect of ambiguities in the Wald's
definition of entropy on the physical process first law. We show that for
linearized perturbations, the integrated version of the physical process law,
which determines the change of entropy between two asymptotic cross-sections,
is independent of these ambiguities. In case of entropy change between two
intermediate cross sections of the horizon, we show that it inherits additional
contributions, which coincide with the membrane energy associated with the
horizon fluid. Using this interpretation, we write down a physical process
first law for entropy change between two arbitrary non-stationary cross
sections of the horizon for both general relativity and Lanczos-Lovelock
gravity.Comment: v3; Minor revision; Published versio
Bottom-quark effects in Higgs production at intermediate transverse momentum.

We provide a precise description of the Higgs boson transverse momentum distribution including top and bottom quark contributions, that is valid for transverse momenta in the range mb ≲ p⊥ ≲ mt, where mb and mt are the bottom and top quark masses. This description is based on a combination of fixed next-to-leading order (NLO) results with next-to-next-to-leading logarithmic (NNLL) transverse momentum resummation. We show that ambiguities in the resummation procedure for the b-quark loops are of the same order as the related fixed-order uncertainties. We conclude that the current uncertainty in the top-bottom interference contribution to the Higgs transverse momentum spectrum is   O(20%)
Leading low-energy effective action in $6D$, ${\cal N}=(1,1)$ SYM theory

We elaborate on the low-energy effective action of $6D,\,{\cal N}=(1,1)$
supersymmetric Yang-Mills (SYM) theory in the ${\cal N}=(1,0)$ harmonic
superspace formulation. The theory is described in terms of analytic ${\cal
N}=(1,0)$ gauge superfield $V^{++}$ and analytic $\omega$-hypermultiplet, both
in the adjoint representation of gauge group. The effective action is defined
in the framework of the background superfield method ensuring the manifest
gauge invariance along with manifest ${\cal N}=(1,0)$ supersymmetry. We
calculate leading contribution to the one-loop effective action using the
on-shell background superfields corresponding to the option when gauge group
$SU(N)$ is broken to $SU(N-1)\times U(1)\subset SU(N)$. In the bosonic sector
the effective action involves the structure $\sim \frac{F^4}{X^2}$, where $F^4$
is a monomial of the fourth degree in an abelian field strength $F_{MN}$ and
$X$ stands for the scalar fields from the $\omega$-hypermultiplet. It is
manifestly demonstrated that the expectation values of the hypermultiplet
scalar fields play the role of a natural infrared cutoff.Comment: 1+14 pages, text essentially remade, some references added, title is
  slightly correcte
Singlet scalar and 2HDM extensions of the Standard Model: CP-violation
  and constraints from $(g-2)_\mu$ and $e$EDM

We study popular scalar extensions of the Standard Model, namely the singlet
extension, the 2-Higgs doublet model (2HDM) and its extension by a singlet
scalar. We focus on the contributions of the added scalars to the anomalous
magnetic moment of the muon, $(g-2)_\mu$ in the presence of CP-violation, and
the electric dipole moment of the electron ($e$EDM) in these models. In the
absence of CP-violation, CP-even and CP-odd scalars contribute with an opposite
sign to the anomalous magnetic moment of the muon and as a result these models
generally require very light scalars to explain the observed discrepancy in
$(g-2)_\mu$. We study the effect of CP-violation on the anomalous magnetic
moment of the muon and its compatibility with the $e$EDM constraints. We show
that given the current status of the global set of constraints applied on all
values of $\cot\beta$, in the CP-violating scalar extensions, there exist no
viable parameter space in agreement with both $a_\mu$ and $e$EDM bounds.Comment: Version appearing in JHE
Wilson lines and Ishibashi states in AdS3/CFT2.

We provide a refined interpretation of a gravitational Wilson line in AdS3 in terms of Ishibashi states in the dual CFT2. Our strategy is to give a method to evaluate the Wilson line that accounts for all the information contained in the representation, and clarify the role of boundary conditions at the endpoints of the line operator. This gives a novel way to explore and reconstruct the local bulk dynamics which we discuss. We also compare our findings with other interpretations of Ishibashi states in AdS3/CFT2
Squashed Holography with Scalar Condensates

We evaluate the partition function of the free and interacting O(N) vector
model on a two-parameter family of squashed three spheres in the presence of a
scalar deformation. We also find everywhere regular solutions of Einstein
gravity coupled to a scalar field in AdS and in dS with the same double
squashed boundary geometry. Remarkably, the thermodynamic properties of the AdS
solutions qualitatively agree with the behavior predicted by the free O(N)
model with a real mass deformation. The dS bulk solutions specify the
semiclassical `no-boundary' measure over anisotropic deformations of
inflationary, asymptotic de Sitter space. Through dS/CFT the partition function
of the interacting O(N) model yields a holographic toy model of the no-boundary
measure. We find this yields a qualitatively similar probability distribution
which is normalizable and globally peaked at the round three sphere, with a low
amplitude for strong anisotropies.Comment: 35 pages, version 2: presentation changed and comments adde
Merging High Energy with Soft and Collinear Logarithms using HEJ and
  PYTHIA

We present a method to combine the all-order treatment of the High Energy
Jets exclusive partonic Monte Carlo (HEJ) with the parton shower of Pythia8,
while retaining the logarithmic accuracy of both. This procedure enables the
generation of fully realistic and hadronised events with HEJ. Furthermore, the
combination of the two all-order treatments leads to improvements in the
quality of the description of observables, in particular for regions with
disparate transverse scales.Comment: 31 pages, 7 figures; updated to published versio
Universality at large transverse spin in defect CFT

We study the spectrum of local operators living on a defect in a generic
conformal field theory, and their coupling to the local bulk operators. We
establish the existence of universal accumulation points in the spectrum at
large $s$, $s$ being the charge of the operators under rotations in the space
transverse to the defect. Our tools include a formula that inverts the bulk to
defect OPE, analogous to the Caron-Huot formula for the four-point function.
Analyticity of the formula in $s$ implies that the scaling dimensions of the
defect operators are aligned in Regge trajectories $\widehat{\Delta}(s)$. These
results require the correlator of two local operators and the defect to be
bounded in a certain region, a condition that we do not prove in general. We
check our conclusions against examples in perturbation theory and holography,
and we make specific predictions concerning the spectrum of defect operators on
Wilson lines. We also give an interpretation of the large $s$ spectrum in the
spirit of the work of Alday and Maldacena.Comment: 45 pages, 6 figures, a few comments added to improve clarity of the
  expositio
Superdensity Operators for Spacetime Quantum Mechanics

We introduce superdensity operators as a tool for analyzing quantum
information in spacetime. Superdensity operators encode spacetime correlation
functions in an operator framework, and support a natural generalization of
Hilbert space techniques and Dirac's transformation theory as traditionally
applied to standard density operators. Superdensity operators can be measured
experimentally, but accessing their full content requires novel procedures. We
demonstrate these statements on several examples. The superdensity formalism
suggests useful definitions of spacetime entropies and spacetime quantum
channels. For example, we show that the von Neumann entropy of a superdensity
operator is related to a quantum generalization of the Kolmogorov-Sinai
entropy, and compute this for a many-body system. We also suggest experimental
protocols for measuring spacetime entropies.Comment: 43+16 pages, 12 figures; v2: typos fixed, references adde
Scalar CFTs and Their Large N Limits

We study scalar conformal field theories whose large $N$ spectrum is fixed by
the operator dimensions of either Ising model or Lee-Yang edge singularity.
Using numerical bootstrap to study CFTs with $S_N\otimes Z_2$ symmetry, we find
a series of kinks whose locations approach
$(\Delta^{\text{Ising}}_{\sigma},\Delta^{\text{Ising}}_{\epsilon})$ at
$N\rightarrow \infty$. Setting $N=4$, we study the cubic anisotropic fixed
point with three spin components. As byproducts of our numerical bootstrap
work, we discover another series of kinks whose identification with previous
known CFTs remains a mystery. We also show that "minimal models" of
$\mathcal{W}_3$ algebra saturate the numerical bootstrap bounds of CFTs with
$S_3$ symmetry.Comment: 29 pages, 5 figure
Holographic Complexity of Einstein-Maxwell-Dilaton Gravity

We study the holographic complexity of Einstein-Maxwell-Dilaton gravity using
the recently proposed "complexity = volume" and "complexity = action"
dualities. The model we consider has a ground state that is represented in the
bulk via a so-called hyperscaling violating geometry. We calculate the action
growth of the Wheeler-DeWitt patch of the corresponding black hole solution at
non-zero temperature and find that, in the presence of violations of
hyperscaling, there is a parametric enhancement of the action growth rate. We
partially match this behavior to simple tensor network models which can capture
aspects of hyperscaling violation. We also exhibit the switchback effect in
complexity growth using shockwave geometries and comment on a subtlety of our
action calculations when the metric is discontinuous at a null surface.Comment: 30 pages; v2: Fixed a technical error. Corrected result no longer has
  a logarithmic divergence in the action growth rate associated with the
  singularity. Conjectured complexity growth rate now also matches better with
  tensor network model
Probing Leptogenesis at Future Colliders

We investigate the question whether leptogenesis, as a mechanism for
explaining the baryon asymmetry of the universe, can be tested at future
colliders. Focusing on the minimal scenario of two right-handed neutrinos, we
identify the allowed parameter space for successful leptogenesis in the heavy
neutrino mass range between $5$ and $50$ GeV. Our calculation includes the
lepton flavour violating contribution from heavy neutrino oscillations as well
as the lepton number violating contribution from Higgs decays to the baryon
asymmetry of the universe. We confront this parameter space region with the
discovery potential for heavy neutrinos at future lepton colliders, which can
be very sensitive in this mass range via displaced vertex searches. Beyond the
discovery of heavy neutrinos, we study the precision at which the
flavour-dependent active-sterile mixing angles can be measured. The measurement
of these mixing angles at future colliders can test whether a minimal type I
seesaw mechanism is the origin of the light neutrino masses, and it can be a
first step towards probing leptogenesis as the mechanism of baryogenesis. We
discuss how a stronger test could be achieved with an additional measurement of
the heavy neutrino mass difference.Comment: 30 pages plus appendix, 13 figures, references added, discussion
  extended, two figures added, matches journal versio
Dissipative hydrodynamics in superspace

We construct a Schwinger-Keldysh effective field theory for relativistic
hydrodynamics for charged matter in a thermal background using a superspace
formalism. Superspace allows us to efficiently impose the symmetries of the
problem and to obtain a simple expression for the effective action. We show
that the theory we obtain is compatible with the Kubo-Martin-Schwinger
condition, which in turn implies that Green's functions obey the
fluctuation-dissipation theorem. Our approach complements and extends existing
formulations found in the literature.Comment: 51 pages, presentation improved, corrected typo
Categorisation and Detection of Dark Matter Candidates from
  String/M-theory Hidden Sectors

We study well-motivated dark matter candidates arising from weakly-coupled
hidden sectors in compactified string/$M$-theory. Imposing generic top-down
constraints greatly restricts allowed candidates. By considering the possible
mechanisms for achieving the correct dark matter relic density, we compile
categories of viable dark matter candidates and annihilation mediators. We
consider the case where supersymmetry breaking occurs via moduli stabilisation
and is gravitationally mediated to the visible and other hidden sectors,
without assuming sequestering of the sector in which supersymmetry is broken.
We find that in this case, weakly-coupled hidden sectors only allow for
fermionic dark matter. Additionally, most of the mechanisms for obtaining the
full relic density only allow for a gauge boson mediator, such as a dark $Z'$.
Given these considerations, we study the potential for discovering or
constraining the allowed parameter space given current and future direct
detection experiments, and direct production at the LHC. We also present a
model of a hidden sector which would contain a satisfactory dark matter
candidate.Comment: 29 pages, 10 figure
Quantum Black Hole Entropy, Localization and the Stringy Exclusion
  Principle

Supersymmetric localization has lead to remarkable progress in computing
quantum corrections to BPS black hole entropy. The program has been successful
especially for computing perturbative corrections to the Bekenstein-Hawking
area formula. In this work, we consider non-perturbative corrections related to
polar states in the Rademacher expansion, which describes the entropy in the
microcanonical ensemble. We propose that these non-perturbative effects can be
identified with a new family of saddles in the localization of the quantum
entropy path integral. We argue that these saddles, which are euclidean
$AdS_2\times S^1\times S^2$ geometries, arise after turning on singular fluxes
in M-theory on a Calabi-Yau. They cease to exist after a certain amount of
flux, resulting in a finite number of geometries; the bound on that number is
in precise agreement with the stringy exclusion principle. Localization of
supergravity on these backgrounds gives rise to a finite tail of Bessel
functions in agreement with the Rademacher expansion. As a check of our
proposal, we test our results against well-known microscopic formulas for
one-eighth and one-quarter BPS black holes in $\mathcal{N}=8$ and
$\mathcal{N}=4$ string theory respectively, finding agreement. Our method
breaks down precisely when mock-modular effects are expected in the entropy of
one-quarter BPS dyons and we comment upon this. Furthermore, we mention
possible applications of these results, including an exact formula for the
entropy of four dimensional $\mathcal{N}=2$ black holes.Comment: 66 page
An Action for and Hydrodynamics from the improved Large D membrane

It has recently been demonstrated that black hole dynamics at large D is dual
to the motion of a probe membrane propagating in the background of a spacetime
that solves Einstein's equations. The equation of motion of this membrane is
determined by the membrane stress tensor. In this paper we `improve' the
membrane stress tensor derived in earlier work to ensure that it defines
consistent probe membrane dynamics even at finite $D$ while reducing to
previous results at large D. Our improved stress tensor is the sum of a Brown
York term and a fluid energy momentum tensor. The fluid has an unusual equation
of state; its pressure is nontrivial but its energy density vanishes. We
demonstrate that all stationary solutions of our membrane equations are
produced by the extremisation of an action functional of the membrane shape.
Our action is an offshell generalization of the membrane's thermodynamical
partition function. We demonstrate that the thermodynamics of static spherical
membranes in flat space and global AdS space exactly reproduces the
thermodynamics of the dual Schwarzschild black holes even at finite D. We study
the long wavelength dynamics of membranes in AdS space, and demonstrate that
the boundary `shadow' of this membrane dynamics is boundary hydrodynamics with
with a definite constitutive relation. We determine the explicit form of shadow
dual boundary stress tensor upto second order in derivatives of the boundary
temperature and velocity, and verify that this stress tensor agrees exactly
with the fluid gravity stress tensor to first order in derivatives, but
deviates from the later at second order and finite D.Comment: 64 pages, v2: footnote added, some typos correcte