pinecone/core-2020-05-10-deduplication huggingface dataset:
Mitigating Direct Detection Bounds in Non-minimal Higgs Portal Scalar
  Dark Matter Models

Minimal scalar Higgs portal dark matter model is increasingly in tension with
recent results form direct detection experiments like LUX and XENON. In this
paper we make a systematic study of minimal extension of the $ \mathbb{Z}_2$
stabilised singlet scalar Higgs portal scenario in terms of their prospects at
direct detection experiments. We consider both enlarging the stabilising
symmetry to $\mathbb{Z}_3$ and incorporating multipartite features in the dark
sector. We demonstrate that in these non-minimal models the interplay of
annihilation, co-annihilation and semi-annihilation processes considerably
relax constraints from present and proposed direct detection experiments while
simultaneously saturating observed dark matter relic density. We explore in
particular the resonant semi-annihilation channel within the multipartite
$\mathbb{Z}_3$ framework which results in new unexplored regions of parameter
space that would be difficult to constrain by direct detection experiments in
the near future. The role of dark matter exchange processes within
multi-component $\mathbb{Z}_3 \times \mathbb{Z}_3'$ framework is illustrated.
We make quantitative estimates to elucidate the role of the various
annihilation processes in the different allowed regions of parameter space of
these models.Comment: 31 pages, 15 figures, added brief discussion on vaccum stability and
  unitarity; minor changes in the text; updated references; typos fixed;
  matches published versio
Operator Dimensions from Moduli

We consider the operator spectrum of a three-dimensional ${\cal N} = 2$
superconformal field theory with moduli spaces of one complex dimension, such
as the fixed point theory with three chiral superfields $X,Y,Z$ and a
superpotential $W = XYZ$. By using the existence of an effective theory on each
branch of moduli space, we calculate the anomalous dimensions of certain
low-lying operators carrying large $R$-charge $J$. While the lowest primary
operator is a BPS scalar primary, the second-lowest scalar primary is in a
semi-short representation, with dimension exactly $J+1$, a fact that cannot be
seen directly from the $XYZ$ Lagrangian. The third-lowest scalar primary lies
in a long multiplet with dimension $J+2 - c_{-3} \, J^{-3} + O(J^{-4})$, where
$c_{-3}$ is an unknown positive coefficient. The coefficient $c_{-3}$ is
proportional to the leading superconformal interaction term in the effective
theory on moduli space. The positivity of $c_{-3}$ does not follow from
supersymmetry, but rather from unitarity of moduli scattering and the absence
of superluminal signal propagation in the effective dynamics of the complex
modulus. We also prove a general lemma, that scalar semi-short representations
form a module over the chiral ring in a natural way, by ordinary multiplication
of local operators. Combined with the existence of scalar semi-short states at
large $J$, this proves the existence of scalar semi-short states at all values
of $J$. Thus the combination of ${\cal N}=2$ superconformal symmetry with the
large-$J$ expansion is more powerful than the sum of its parts.Comment: 48 pages, 8 figures, LaTeX, typos correcte
Study of prompt $D^0$ meson production in pPb collisions at $\sqrt s_{NN} = 5$ TeV

Production of prompt $D^0$ mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58 \pm 0.02 nb^{−1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt s_{NN} = 5$ TeV. Measurements of the differential cross-section, the forward-backward production ratio and the nuclear modification factor are reported using $D^0$ candidates with transverse momenta less than 10 GeV/c and rapidities in the ranges $1.5 < y^ ∗ < 4.0$ and $−5.0 < y^ ∗ < −2.5$ in the nucleon-nucleon centre-of-mass system
General equilibrium second-order hydrodynamic coefficients for free
  quantum fields

We present a systematic calculation of the corrections of the stress-energy
tensor and currents of the free boson and Dirac fields up to second order in
thermal vorticity, which is relevant for relativistic hydrodynamics. These
corrections are non-dissipative because they survive at general thermodynamic
equilibrium with non vanishing mean values of the conserved generators of the
Lorentz group, i.e. angular momenta and boosts. Their equilibrium nature makes
it possible to express the relevant coefficients by means of correlators of the
angular-momentum and boost operators with stress-energy tensor and current,
thus making simpler to determine their so-called "Kubo formulae". We show that,
at least for free fields, the corrections are of quantum origin and we study
several limiting cases and compare our results with previous calculations. We
find that the axial current of the free Dirac field receives corrections
proportional to the vorticity independently of the anomalous term.Comment: 33 pages, final version published in JHE
Entangled wavepackets in the vacuum

Motivated by the black hole firewall problem, we find highly entangled pairs
of spatially localized modes in quantum field theory. We demonstrate that
appropriately chosen wavepackets localized outside the horizon are nearly
purified by 'mirror' modes behind the horizon. In addition, we calculate the
entanglement entropy of a single localized wavepacket in the Minkowski vacuum.
In all cases we study, the quantum state of the system becomes pure in the
limit that the wavepackets delocalize; we quantify the trade-off between
localization and purity.Comment: 33 pages, 4 figures. v3: typos correcte
Gravity-Mediated Dark Matter Annihilation in the Randall-Sundrum Model

Observational evidence for dark matter stems from its gravitational
interactions, and as of yet there has been no evidence for dark matter
interacting via other means. We examine models where dark matter interactions
are purely gravitational in a Randall-Sundrum background. In particular, the
Kaluza-Klein tower of gravitons which result from the warped fifth dimension
can provide viable annihilation channels into Standard Model final states, and
we find that we can achieve values of the annihilation cross section, $\left<
\sigma v \right>$, which are consistent with the observed relic abundance in
the case of spin-1 dark matter. We examine constraints on these models
employing both the current photon line and continuum indirect dark matter
searches, and assess the prospects of hunting for the signals of such models in
future direct and indirect detection experiments.Comment: 33 pages, 8 figures; added references and fixed minor typo
Baryogenesis at a Lepton-Number-Breaking Phase Transition

We study a scenario in which the baryon asymmetry of the universe arises from
a cosmological phase transition where lepton-number is spontaneously broken. If
the phase transition is first order, a lepton-number asymmetry can arise at the
bubble wall, through dynamics similar to electroweak baryogenesis, but
involving right-handed neutrinos. In addition to the usual neutrinoless double
beta decay in nuclear experiments, the model may be probed through a variety of
"baryogenesis by-products," which include a stochastic background of
gravitational waves created by the colliding bubbles. Depending on the model,
other aspects may include a network of topological defects that produce their
own gravitational waves, additional contribution to dark radiation, and a light
pseudo-Goldstone boson (majoron) as dark matter candidate.Comment: 21 pages + 10 appendices & references, 3 figure
The Leptoquark Hunter's Guide: Pair Production

Leptoquarks occur in many new physics scenarios and could be the next big
discovery at the LHC. The purpose of this paper is to point out that a
model-independent search strategy covering all possible leptoquarks is possible
and has not yet been fully exploited. To be systematic we organize the possible
leptoquark final states according to a leptoquark matrix with entries
corresponding to nine experimentally distinguishable leptoquark decays: any of
{light-jet, b-jet, top} with any of {neutrino, $e/\mu$, $\tau$}. The 9
possibilities can be explored in a largely model-independent fashion with
pair-production of leptoquarks at the LHC. We review the status of experimental
searches for the 9 components of the leptoquark matrix, pointing out which 3
have not been adequately covered. We plead that experimenters publish bounds on
leptoquark cross sections as functions of mass for as wide a range of
leptoquark masses as possible. Such bounds are essential for reliable recasts
to general leptoquark models. To demonstrate the utility of the leptoquark
matrix approach we collect and summarize searches with the same final states as
leptoquark pair production and use them to derive bounds on a complete set of
Minimal Leptoquark models which span all possible flavor and gauge
representations for scalar and vector leptoquarks.Comment: 19 pages + references and appendices, 18 figures, 15 tables. Added
  references, fixed typo
Tessellating cushions: four-point functions in N=4 SYM

We consider a class of planar tree-level four-point functions in N=4 SYM in a
special kinematic regime: one BMN operator with two scalar excitations and
three half-BPS operators are put onto a line in configuration space;
additionally, for the half-BPS operators a co-moving frame is chosen in flavour
space. In configuration space, the four-punctured sphere is naturally
triangulated by tree-level planar diagrams. We demonstrate on a number of
examples that each tile can be associated with a modified hexagon form-factor
in such a way as to efficiently reproduce the tree-level four-point function.
Our tessellation is not of the OPE type, fostering the hope of finding an
independent, integrability-based approach to the computation of planar
four-point functions.Comment: 10 pages, 2 figure
Towards a Finite-$N$ Hologram

We suggest that holographic tensor models related to SYK are viable
candidates for exactly (ie., non-perturbatively in $N$) solvable holographic
theories. The reason is that in these theories, the Hilbert space is a spinor
representation, and the Hamiltonian (at least in some classes) can be arranged
to commute with the Clifford level. This makes the theory solvable level by
level. We demonstrate this for the specific case of the uncolored $O(n)^3$
tensor model with arbitrary even $n$, and reduce the question of determining
the spectrum and eigenstates to an algebraic equation relating Young tableaux.
Solving this reduced problem is conceptually trivial and amounts to matching
the representations on either side, as we demonstrate explicitly at low levels.
At high levels, representations become bigger, but should still be tractable.
None of our arguments require any supersymmetry.Comment: 16 page
Neutrino mu-tau reflection symmetry and its breaking in the minimal
  seesaw

In this paper, we attempt to implement the neutrino $\mu$-$\tau$ reflection
symmetry (which predicts $\theta^{}_{23} = \pi/4$ and $\delta = \pm \pi/2$ as
well as trivial Majorana phases) in the minimal seesaw (which enables us to fix
the neutrino masses). For some direct (the preliminary experimental hints
towards $\theta^{}_{23} \neq \pi/4$ and $\delta \neq - \pi/2$) and indirect
(inclusion of the renormalization group equation effect and implementation of
the leptogenesis mechanism) reasons, we particularly study the breakings of
this symmetry and their phenomenological consequences.Comment: 20 pages, 7 figures, accepted for publication in JHE
Linear response of entanglement entropy from holography

For time-independent excited states in conformal field theories, the
entanglement entropy of small subsystems satisfies a `first law'-like relation,
in which the change in entanglement is proportional to the energy within the
entangling region. Such a law holds for time-dependent scenarios as long as the
state is perturbatively close to the vacuum, but is not expected otherwise. In
this paper we use holography to investigate the spread of entanglement entropy
for unitary evolutions of special physical interest, the so-called global
quenches. We model these using AdS-Vaidya geometries. We find that the first
law of entanglement is replaced by a linear response relation, in which the
energy density takes the role of the source and is integrated against a
time-dependent kernel with compact support. For adiabatic quenches the standard
first law is recovered, while for rapid quenches the linear response includes
an extra term that encodes the process of thermalization. This extra term has
properties that resemble a time-dependent `relative entropy'. We propose that
this quantity serves as a useful order parameter to characterize
far-from-equilibrium excited states. We illustrate our findings with concrete
examples, including generic power-law and periodically driven quenches.Comment: 31+3 pages, 8 figures; v2: typos fixed and references added; v3:
  claims on universality sharpened (section 2.1), version to appear in JHE
One-loop monodromy relations on single cuts

The discovery of colour-kinematic duality has led to significant progress in
the computation of scattering amplitudes in quantum field theories. At tree
level, the origin of the duality can be traced back to the monodromies of
open-string amplitudes. This construction has recently been extended to all
loop orders. In the present paper, we dissect some consequences of these new
monodromy relations at one loop. We use single cuts in order to relate them to
the tree-level relations. We show that there are new classes of kinematically
independent single-cut amplitudes. Then we turn to the Feynman diagrammatics of
the string-theory monodromy relations. We revisit the string-theoretic
derivation and argue that some terms, that vanish upon integration in string
and field theory, provide a characterisation of momentum-shifting ambiguities
in these representations. We observe that colour-dual representations are
compatible with this analysis.Comment: 24 pages + appendices + refs; v3 minor corrections, journal versio
Lagrangians for generalized Argyres-Douglas theories

We continue the study of Lagrangian descriptions of $\mathcal{N}=2$
Argyres-Douglas theories. We use our recent interpretation in terms of
sequential confinement to guess the Lagrangians of all the Argyres-Douglas
models with Abelian three dimensional mirror. We find classes of four
dimensional $\mathcal{N}=1$ quivers that flow in the infrared to generalized
Argyres-Douglas theories, such as the $(A_k,A_{kN+N-1})$ models. We study in
detail how the $\mathcal{N}=1$ chiral rings map to the Coulomb and Higgs
Branches of the $\mathcal{N}=2$ CFT's. The three dimensional mirror RG flows
are shown to land on the $\mathcal{N}=4$ complete graph quivers. We also
compactify to three dimensions the gauge theory dual to $(A_1,D_4)$, and find
the expected Abelianization duality with $\mathcal{N}=4$ SQED with $3$ flavors.Comment: 49 pages. v2: refs adde
Circuit complexity in quantum field theory

Motivated by recent studies of holographic complexity, we examine the
question of circuit complexity in quantum field theory. We provide a quantum
circuit model for the preparation of Gaussian states, in particular the ground
state, in a free scalar field theory for general dimensions. Applying the
geometric approach of Nielsen to this quantum circuit model, the complexity of
the state becomes the length of the shortest geodesic in the space of circuits.
We compare the complexity of the ground state of the free scalar field to the
analogous results from holographic complexity, and find some surprising
similarities.Comment: Corrected typo in eqs. (1.1) and (3.35). Added footnote on pg. 33,
  and additional references. Author name chang
Background independent holographic dual to $T\bar{T}$ deformed CFT with
  large central charge in 2 dimensions

The geometerization of the renormalization group flow triggered by the
$T\bar{T}$ deformation of large $c$ conformal field theories in two dimensions
is presented. This entails the construction of the off shell Einstein-Hilbert
action in three dimensions from said renormalization group flow.
  The crucial ingredient to this construction will be the encoding of general
covariance in the emergent bulk theory in a very particular form of the
Wess--Zumino consistency conditions. The utilisation of the local
renormalization group, which requires putting the theory under consideration on
an arbitrary background geometry, supplemented by the aforementioned covariance
condition ensures that the whole construction is background independent.Comment: 13 pages, no figure
Minimal Non-Abelian Supersymmetric Twin Higgs

We propose a minimal supersymmetric Twin Higgs model that can accommodate
tuning of the electroweak scale for heavy stops better than 10% with high
mediation scales of supersymmetry breaking. A crucial ingredient of this model
is a new SU(2)_X gauge symmetry which provides a D-term potential that
generates a large SU(4) invariant coupling for the Higgs sector and only small
set of particles charged under SU(2)_X, which allows the model to be
perturbative around the Planck scale. The new gauge interaction drives the top
yukawa coupling small at higher energy scales, which also reduces the tuning.Comment: 24 pages, 7 figures, matched to the published versio
Holographic constraints on Bjorken hydrodynamics at finite coupling

In large-$N_c$ conformal field theories with classical holographic duals,
inverse coupling constant corrections are obtained by considering
higher-derivative terms in the corresponding gravity theory. In this work, we
use type IIB supergravity and bottom-up Gauss-Bonnet gravity to study the
dynamics of boost-invariant Bjorken hydrodynamics at finite coupling. We
analyze the time-dependent decay properties of non-local observables (scalar
two-point functions and Wilson loops) probing the different models of Bjorken
flow and show that they can be expressed generically in terms of a few field
theory parameters. In addition, our computations provide an analytically
quantifiable probe of the coupling-dependent validity of hydrodynamics at early
times in a simple model of heavy-ion collisions, which is an observable closely
analogous to the hydrodynamization time of a quark-gluon plasma. We find that
to third order in the hydrodynamic expansion, the convergence of hydrodynamics
is improved and that generically, as expected from field theory considerations
and recent holographic results, the applicability of hydrodynamics is delayed
as the field theory coupling decreases.Comment: 37+5 pages, multiple figures. v2: typos corrected, matches published
  versio
Current Interactions and Holography from the 0-Form Sector of Nonlinear
  Higher-Spin Equations

The form of higher-spin current interactions in $AdS_4$ is derived from the
full nonlinear higher-spin equations in the sector of Weyl 0-forms. The
coupling constant in front of spin-one currents built from scalars and spinors
as well as Yukawa coupling are determined explicitly. Couplings of all other
higher-spin current interactions are determined implicitly. All couplings are
shown to be independent of the phase parameter of the nonlinear higher-spin
theory. The proper holographic dependence of the vertex on the higher-spin
phase parameter is shown to result from the boundary conditions on the bulk
fields.Comment: 29 pages; V2: Discussion of locality is reduced in favor of a focused
  forthcoming paper. The title is modified correspondingly. Coefficients and
  typos corrected. 26 pages; V3: Section 5.2 explaining the idea of derivation
  of the main result and references are added. The Journal version. 28 page
Berry Phases on Virasoro Orbits

We point out that unitary representations of the Virasoro algebra contain
Berry phases obtained by acting on a primary state with conformal
transformations that trace a closed path on a Virasoro coadjoint orbit. These
phases can be computed exactly thanks to the Maurer-Cartan form on the Virasoro
group, and they persist after combining left- and right-moving sectors.
Thinking of Virasoro representations as particles in AdS_3 dressed with
boundary gravitons, the Berry phases associated with Brown-Henneaux
diffeomorphisms provide a gravitational extension of Thomas precession.Comment: 34 pages, 3 figures. v2: examples moved to appendix + minor
  clarifications. Published in JHE
Three particle quantization condition in a finite volume: 2. general
  formalism and the analysis of data

We derive the three-body quantization condition in a finite volume using an
effective field theory in the particle-dimer picture. Moreover, we consider the
extraction of physical observables from the lattice spectrum using the
quantization condition. To illustrate the general framework, we calculate the
volume-dependent three-particle spectrum in a simple model both below and above
the three-particle threshold. The relation to existing approaches is discussed
in detail.Comment: 36 pages, 9 figure
Exact relativistic Toda chain eigenfunctions from Separation of
  Variables and gauge theory

We provide a proposal, motivated by Separation of Variables and gauge theory
arguments, for constructing exact solutions to the quantum Baxter equation
associated to the $N$-particle relativistic Toda chain and test our proposal
against numerical results. Quantum Mechanical non-perturbative corrections,
essential in order to obtain a sensible solution, are taken into account in our
gauge theory approach by considering codimension two defects on curved
backgrounds (squashed $S^5$ and degenerate limits) rather than flat space; this
setting also naturally incorporates exact quantization conditions and energy
spectrum of the relativistic Toda chain as well as its modular dual structure.Comment: 85 pages, 6 tables, 21 figure
Long Multiplet Bootstrap

Applications of the bootstrap program to superconformal field theories
promise unique new insights into their landscape and could even lead to the
discovery of new models. Most existing results of the superconformal bootstrap
were obtained form correlation functions of very special fields in short (BPS)
representations of the superconformal algebra. Our main goal is to initiate a
superconformal bootstrap for long multiplets, one that exploits all constraints
from superprimaries and their descendants. To this end, we work out the Casimir
equations for four-point correlators of long multiplets of the two-dimensional
global $\mathcal{N}=2$ superconformal algebra. After constructing the full set
of conformal blocks we discuss two different applications. The first one
concerns two-dimensional (2,0) theories. The numerical bootstrap analysis we
perform serves a twofold purpose, as a feasibility study of our long multiplet
bootstrap and also as an exploration of (2,0) theories. A second line of
applications is directed towards four-dimensional $\mathcal{N}=3$ SCFTs. In
this context, our results imply a new bound $c \geqslant \tfrac{13}{24}$ for
the central charge of such models, which we argue cannot be saturated by an
interacting SCFT.Comment: 39 pages (32 plus one appendix), 4 figures; v2: added discussion on
  the non-saturation of the analytic central charge bound; v3: footnote added,
  small typos correcte