pinecone/core-2020-05-10-deduplication huggingface dataset:
State sum constructions of spin-TFTs and string net constructions of
  fermionic phases of matter

It is possible to describe fermionic phases of matter and spin-topological
field theories in 2+1d in terms of bosonic "shadow" theories, which are
obtained from the original theory by "gauging fermionic parity". The
fermionic/spin theories are recovered from their shadow by a process of
fermionic anyon condensation: gauging a one-form symmetry generated by
quasi-particles with fermionic statistics. We apply the formalism to theories
which admit gapped boundary conditions. We obtain Turaev-Viro-like and
Levin-Wen-like constructions of fermionic phases of matter. We describe the
group structure of fermionic SPT phases protected by the product of fermion
parity and internal symmetry G. The quaternion group makes a surprise
appearance.Comment: 92 pages. v2: an analysis of the equivariant toric code in the
  appendix has been corrected and simplifie
A light sneutrino rescues the light stop

Stop searches in supersymmetric frameworks with $R$-parity conservation
usually assume the lightest neutralino to be the lightest supersymmetric
particle. In this paper we consider an alternative scenario in which the
left-handed tau sneutrino is lighter than neutralinos and stable at collider
scales, but possibly unstable at cosmological scales. Moreover the (mostly
right-handed) stop $\widetilde t$ is lighter than all electroweakinos, and
heavier than the scalars of the third generation doublet, whose charged
component, $\widetilde\tau$, is heavier than the neutral one, $\widetilde\nu$.
The remaining supersymmetric particles are decoupled from the stop
phenomenology. In most of the parameter space, the relevant stop decays are
only into $t \widetilde\tau \tau$, $t\widetilde\nu\nu$ and $b \widetilde\nu
\tau$ via off-shell electroweakinos. We constrain the branching ratios of these
decays by recasting the most sensitive stop searches. Due to the "double
invisible" kinematics of the $\widetilde t\to t\widetilde\nu\nu$ process, and
the low efficiency in tagging the $t\widetilde\tau\tau$ decay products, light
stops are generically allowed. In the minimal supersymmetric standard model
with $\sim$ 100 GeV sneutrinos, stops with masses as small as $\sim$ 350 GeV
turn out to be allowed at 95% CL.Comment: 25 page
Bootstrapping Mixed Correlators in the Five Dimensional Critical O(N)
  Models

We use the conformal bootstrap approach to explore $5D$ CFTs with $O(N)$
global symmetry, which contain $N$ scalars $\phi_i$ transforming as $O(N)$
vector. Specifically, we study multiple four-point correlators of the leading
$O(N)$ vector $\phi_i$ and the $O(N)$ singlet $\sigma$. The crossing symmetry
of the four-point functions and the unitarity condition provide nontrivial
constraints on the scaling dimensions ($\Delta_\phi$, $\Delta_\sigma$) of
$\phi_i$ and $\sigma$. With reasonable assumptions on the gaps between scaling
dimensions of $\phi_i$ ($\sigma$) and the next $O(N)$ vector (singlet) scalar,
we are able to isolate the scaling dimensions $(\Delta_\phi$, $\Delta_\sigma)$
in small islands. In particular, for large $N=500$, the isolated region is
highly consistent with the result obtained from large $N$ expansion.
  We also study the interacting $O(N)$ CFTs for $1\leqslant N\leqslant100$.
Isolated regions on $(\Delta_\phi,\Delta_\sigma)$ plane are obtained using
conformal bootstrap program with lower order of derivatives $\Lambda$; however,
they disappear after increasing $\Lambda$. We think these islands are
corresponding to interacting but nonunitary $O(N)$ CFTs. Our results provide a
lower bound on the critical value $N_c>100$, below which the interacting $O(N)$
CFTs turn into nonunitary. The critical value is unexpectedly large comparing
with previous estimations.Comment: 28 pages, 4 figure
Collisions of Dark Matter Axion Stars with Astrophysical Sources

If QCD axions form a large fraction of the total mass of dark matter, then
axion stars could be very abundant in galaxies. As a result, collisions with
each other, and with other astrophysical bodies, can occur. We calculate the
rate and analyze the consequences of three classes of collisions, those
occurring between a dilute axion star and: another dilute axion star, an
ordinary star, or a neutron star. In all cases we attempt to quantify the most
important astrophysical uncertainties; we also pay particular attention to
scenarios in which collisions lead to collapse of otherwise stable axion stars,
and possible subsequent decay through number changing interactions. Collisions
between two axion stars can occur with a high total rate, but the low relative
velocity required for collapse to occur leads to a very low total rate of
collapses. On the other hand, collisions between an axion star and an ordinary
star have a large rate, $\Gamma_\odot \sim 3000$ collisions/year/galaxy, and
for sufficiently heavy axion stars, it is plausible that most or all such
collisions lead to collapse. We identify in this case a parameter space which
has a stable region and a region in which collision triggers collapse, which
depend on the axion number ($N$) in the axion star, and a ratio of mass to
radius cubed characterizing the ordinary star ($M_s/R_s^3$). Finally, we
revisit the calculation of collision rates between axion stars and neutron
stars, improving on previous estimates by taking cylindrical symmetry of the
neutron star distribution into account. Collapse and subsequent decay through
collision processes, if occurring with a significant rate, can affect dark
matter phenomenology and the axion star mass distribution.Comment: 19 pages, 5 figures. v2: References added, typos correcte
Matrix product states and equivariant topological field theories for
  bosonic symmetry-protected topological phases in (1+1) dimensions

Matrix Product States (MPSs) provide a powerful framework to study and
classify gapped quantum phases --symmetry-protected topological (SPT) phases in
particular--defined in one dimensional lattices. On the other hand, it is
natural to expect that gapped quantum phases in the limit of zero correlation
length are described by topological quantum field theories (TFTs or TQFTs). In
this paper, for (1+1)-dimensional bosonic SPT phases protected by symmetry $G$,
we bridge their descriptions in terms of MPSs, and those in terms of
$G$-equivariant TFTs. In particular, for various topological invariants (SPT
invariants) constructed previously using MPSs, we provide derivations from the
point of view of (1+1) TFTs. We also discuss the connection between boundary
degrees of freedom, which appear when one introduces a physical boundary in SPT
phases, and "open" TFTs, which are TFTs defined on spacetimes with boundaries.Comment: 1+48 pages, many figures. One paragraph "Discrete torsion phase (2):
  partial symmetry action and swapping" in page 10 has been added. final
  versio
Temperature dependence of shear viscosity of $SU(3)$--gluodynamics
  within lattice simulation

In this paper we study the shear viscosity temperature dependence of
$SU(3)$--gluodynamics within lattice simulation. To do so, we measure the
correlation functions of energy-momentum tensor in the range of temperatures
$T/T_c\in [0.9, 1.5]$. To extract the values of shear viscosity we used two
approaches. The first one is to fit the lattice data with some physically
motivated ansatz for the spectral function with unknown parameters and then
determine shear viscosity. The second approach is to apply the Backus-Gilbert
method which allows to extract shear viscosity from the lattice data
nonparametrically. The results obtained within both approaches agree with each
other. Our results allow us to conclude that within the temperature range
$T/T_c \in [0.9, 1.5]$ SU(3)--gluodynamics reveals the properties of a strongly
interacting system, which cannot be described perturbatively, and has the ratio
$\eta/s$ close to the value ${1}/{4\pi}$ in $N = 4$ Supersymmetric Yang-Mills
theory.Comment: Typos in references are corrected and the acknowledgements are
  modifie
All Chern-Simons Invariants of 4D, N = 1 Gauged Superform Hierarchies

We give a geometric description of supersymmetric gravity/(non-)abelian
$p$-form hierarchies in superspaces with 4D, $N = 1$ super-Poincare invariance.
These hierarchies give rise to Chern-Simons-like invariants, such as those of
the 5D, $N = 1$ graviphoton and the eleven-dimensional 3-form but also
generalizations such as Green-Schwarz-like/BF-type couplings. Previous
constructions based on prepotential superfields are reinterpreted in terms of
$p$-forms in superspace thereby elucidating the underlying geometry. This
vastly simplifies the calculations of superspace field-strengths, Bianchi
identities, and Chern-Simons invariants. Using this, we prove the validity of a
recursive formula for the conditions defining these actions for any such tensor
hierarchy. Solving it at quadratic and cubic orders, we recover the known
results for the BF-type and cubic Chern-Simons actions. As an application, we
compute the quartic invariant $\sim A dA dA dA + \ldots$ relevant, for example,
to seven-dimensional supergravity compactifications.Comment: 31 pages; v2: added reference
Mass-deformed ABJM Theory and LLM Geometries: Exact Holography

We present a detailed account and extension of our claim in arXiv:1610.01490.
We test the gauge/gravity duality between the ${\cal N} = 6$ mass-deformed ABJM
theory with U$_k(N)\times$U$_{-k}(N)$ gauge symmetry and the 11-dimensional
supergravity on LLM geometries with SO(4)/${\mathbb Z}_k$
$\times$SO(4)/${\mathbb Z}_k$ isometry, in the large $N$ limit. Our analysis is
based on the evaluation of vacuum expectation values of chiral primary
operators from the supersymmetric vacua of mass-deformed ABJM theory and from
the implementation of Kaluza-Klein holography to the LLM geometries. We focus
on the chiral primary operator with conformal dimension $\Delta = 1$. We show
that $\langle {\cal O}^{(\Delta=1)}\rangle= N^{\frac32} \, f_{(\Delta=1)}$ for
all supersymmetric vacuum solutions and LLM geometries with $k=1$, where the
factor $f_{(\Delta)}$ is independent of $N$. We also confirm that the vacuum
expectation value of the the energy momentum tensor is vanishing as expected by
the supersymmetry. We extend our results to the case of $k\ne 1$ for LLM
geometries represented by rectangular-shaped Young-diagrams. In analogy with
the Coulomb branch of the ${\cal N} = 4$ super Yang-Mills theory, we argue that
the discrete Higgs vacua of the mABJM theory as well as the corresponding LLM
geometries are parametrized by the vevs of the chiral primary operators.Comment: 44 pages, 1 figure, major corrections in section 3 and 5, references
  added, title change
Associated production of a top pair and a Z boson at the LHC to NNLL
  accuracy

We study the resummation of soft gluon emission corrections to the production
of a top-antitop pair in association with a Z boson at the Large Hadron
Collider to next-to-next-to-leading logarithmic accuracy. By means of an
in-house parton level Monte Carlo code we evaluate the resummation formula for
the total cross section and several differential distributions at a
center-of-mass energy of 13 TeV, and we match these calculations to
next-to-leading order results.Comment: 21 pages, 7 figures. arXiv admin note: text overlap with
  arXiv:1611.0004
Point-Particle Effective Field Theory I: Classical Renormalization and
  the Inverse-Square Potential

Singular potentials (the inverse-square potential, for example) arise in many
situations and their quantum treatment leads to well-known ambiguities in
choosing boundary conditions for the wave-function at the position of the
potential's singularity. These ambiguities are usually resolved by developing a
self-adjoint extension of the original problem; a non-unique procedure that
leaves undetermined which extension should apply in specific physical systems.
We take the guesswork out of this picture by using techniques of effective
field theory to derive the required boundary conditions at the origin in terms
of the effective point-particle action describing the physics of the source. In
this picture ambiguities in boundary conditions boil down to the allowed
choices for the source action, but casting them in terms of an action provides
a physical criterion for their determination. The resulting extension is
self-adjoint if the source action is real (and involves no new degrees of
freedom), and not otherwise (as can also happen for reasonable systems). We
show how this effective-field picture provides a simple framework for
understanding well-known renormalization effects that arise in these systems,
including how renormalization-group techniques can resum non-perturbative
interactions that often arise, particularly for non-relativistic applications.
In particular we argue why the low-energy effective theory tends to produce a
universal RG flow of this type and describe how this can lead to the phenomenon
of reaction {\em catalysis}, in which physical quantities (like scattering
cross sections) can sometimes be surprisingly large compared to the underlying
scales of the source in question. We comment in passing on the possible
relevance of these observations to the phenomenon of the catalysis of
baryon-number violation by scattering from magnetic monopoles.Comment: LaTeX, 20 pages plus appendi
Two-Higgs-Doublet-Portal Dark-Matter Models in Light of Direct Search
  and LHC Data

We explore simple Higgs-portal models of dark matter (DM) with spin 1/2, 3/2,
and 1, respectively, applying to them constraints from the LUX and PandaX-II
direct detection experiments and from LHC measurements on the 125-GeV Higgs
boson. With only one Higgs doublet, we find that the spin-1/2 DM having a
purely scalar effective coupling to the doublet is viable only in a narrow
range of mass near the Higgs pole, whereas the vector DM is still allowed if
its mass is also close to the Higgs pole or exceeds 1.4 TeV, both in line with
earlier analyses. Moreover, the spin-3/2 DM is in a roughly similar situation
to the spin-1/2 DM, but has surviving parameter space which is even more
restricted. We also consider the two-Higgs-doublet extension of each of the
preceding models, assuming that the expanded Yukawa sector is that of the
two-Higgs-doublet model of type II. We show that in these
two-Higgs-doublet-portal models significant portions of the DM mass regions
excluded in the simplest scenarios by direct search bounds can be reclaimed due
to suppression of the effective DM interactions with nucleons at some ratios of
the $CP$-even Higgs bosons' couplings to the up and down quarks. The regained
parameter space contains areas which can yield a DM-nucleon scattering
cross-section that is far less than its current experimental limit or even goes
below the neutrino-background floor.Comment: 26 pages, 10 figures, somewhat expanded, references added, main
  conclusions unchanged, matches publicatio
Exact solutions and critical chaos in dilaton gravity with a boundary

We consider (1+1)-dimensional dilaton gravity with a reflecting dynamical
boundary. The boundary cuts off the region of strong coupling and makes our
model causally similar to the spherically-symmetric sector of multidimensional
gravity. We demonstrate that this model is exactly solvable at the classical
level and possesses an on-shell SL(2,R) symmetry. After introducing general
classical solution of the model, we study a large subset of soliton solutions.
The latter describe reflection of matter waves off the boundary at low energies
and formation of black holes at energies above critical. They can be related to
the eigenstates of the auxiliary integrable system, the Gaudin spin chain. We
argue that despite being exactly solvable, the model in the critical regime,
i.e. at the verge of black hole formation, displays dynamical instabilities
specific to chaotic systems. We believe that this model will be useful for
studying black holes and gravitational scattering.Comment: 31 pages, 10 figures, 2 tables; journal versio
Finite Temperature Corrections to Tachyon Mass in Intersecting D-Branes

We continue with the analysis of finite temperature corrections to the
Tachyon mass in intersecting branes which was initiated in arxiv:1403.0389. In
this paper we extend the computation to the case of intersecting D3-branes by
considering a setup of two intersecting branes in flat-space background. A
holographic model dual to BCS superconductor consisting of intersecting
D8-branes in D4-brane background was proposed in arxiv:1104.2843. The
background considered here is a simplified configuration of this dual model. We
compute the one-loop Tachyon amplitude in the Yang-Mills approximation and show
that the result is finite. Analyzing the amplitudes further we numerically
compute the transition temperature at which the Tachyon becomes massless. The
analytic expressions for the one-loop amplitudes obtained here reduce to those
for intersecting D1-branes obtained in arxiv:1403.0389 as well as those for
intersecting D2-branes.Comment: 73 pages, 24 figures, articl
Dark Matter characterization at the LHC in the Effective Field Theory
  approach

We have studied the complete set of dimension 5 and dimension 6 effective
operators involving the interaction of scalar, fermion and vector Dark Matter
(DM) with SM quarks and gluons, to explore the possibility to distinguish these
operators and characterise the spin of DM at the LHC. We have found that three
factors - the effective dimension of the operator, the structure of the SM part
of the operator and the parton densities of the SM particles connected to the
operator - uniquely define the shape of the (unobservable) invariant mass
distribution of the DM pair and, consequently, the shape of the (observable)
MET distribution related to it. Using $\chi^2$ analysis, we found that at the
LHC, with a luminosity of 300 fb$^{-1}$, certain classes of EFT operators can
be distinguished from each other. Hence, since DM spin is partly correlated
with the factors defining the shape of MET, the LHC can potentially shed a
light also on DM spin. We have also observed a drastic difference in the
efficiencies (up to two orders of magnitude) for large MET cuts scenarios with
different DM spin, thus indicating that the DM discovery potential strongly
depends on it. The study we perform here can be applied more generally than
within the EFT paradigm, where the DM mediator is not produced
on-the-mass-shell, such as the case of t-channel mediator or mediator with mass
below $2M_{DM}$, where the invariant mass of the DM pair is not fixed.Comment: 38 pages, 15 figures, 6 tables. Operators for vector DM have been
  reparametrised to highlight their proper energy behaviour. Version accepted
  for publication in JHE
Chiral 2d Theories from N=4 SYM with Varying Coupling

We study 2d chiral theories arising from 4d N=4 Super-Yang Mills (SYM) with
varying coupling tau. The 2d theory is obtained by dimensional reduction of N=4
SYM on a complex curve with a partial topological twist that accounts for the
non-constant tau. The resulting 2d theories can preserve (0,n) with n = 2, 4,
6, 8 chiral supersymmetry, and have a natural realization in terms of strings
from wrapped D3-branes in F-theory. We determine the twisted dimensional
reduction, as well as the spectrum and anomaly polynomials of the resulting
strings in various dimensions. We complement this by considering the dual
M-theory configurations, which can either be realized in terms of M5-branes
wrapped on complex surfaces, or M2-branes on curves that result in 1d
supersymmetric quantum mechanics.Comment: 78 pages, 2 figures, v2: references adde
Simplified dark matter models in the light of AMS-02 antiproton data

In this work we perform an analysis of the recent AMS-02 antiproton flux and
the antiproton-to-proton ratio in the framework of simplified dark matter
models. To predict the AMS-02 observables we adopt the propagation and
injection parameters determined by the observed fluxes of nuclei. We assume
that the dark matter particle is a Dirac fermionic dark matter, with
leptophobic pseudoscalar or axialvector mediator that couples only to Standard
Model quarks and dark matter particles. We find that the AMS-02 observations
are consistent with the dark matter hypothesis within the uncertainties. The
antiproton data prefer a dark matter (mediator) mass in the 700 GeV--5 TeV
region for the annihilation with pseudoscalar mediator and greater than 700 GeV
(200 GeV--1 TeV) for the annihilation with axialvector mediator, respectively,
at about 68% confidence level. The AMS-02 data require an effective dark matter
annihilation cross section in the region of 1x10^{-25} -- 1x10^{-24}
(1x10^{-25} -- 4x10^{-24}) cm^3/s for the simplified model with pseudoscalar
(axialvector) mediator. The constraints from the LHC and Fermi-LAT are also
discussed.Comment: 16 pages, 6 figures, 1 table. arXiv admin note: text overlap with
  arXiv:1509.0221
Factorising the 3D Topologically Twisted Index

We explore the path integration -- upon the contour of hermitian
(non-auxliary) field configurations -- of topologically twisted $\mathcal{N}=2$
Chern-Simons-matter theory (TTCSM) on $\mathbb{S}_2$ times a segment. In this
way, we obtain the formula for the 3D topologically twisted index, first as a
convolution of TTCSM on $\mathbb{S}_2$ times halves of $\mathbb{S}_1$, second
as TTCSM on $\mathbb{S}_2$ times $\mathbb{S}_1$ -- with a puncture --, and
third as TTCSM on $\mathbb{S}_2 \times \mathbb{S}_1$. In contradistinction to
the first two cases, in the third case, the vector multiplet auxiliary field
$D$ is constrained to be anti-hermitian.Comment: v2:typos corrected and improved presentation of section 3; v3:
  matches the published versio
Curtailing the Dark Side in Non-Standard Neutrino Interactions

In presence of non-standard neutrino interactions the neutrino flavor
evolution equation is affected by a degeneracy which leads to the so-called
LMA-Dark solution. It requires a solar mixing angle in the second octant and
implies an ambiguity in the neutrino mass ordering. Non-oscillation experiments
are required to break this degeneracy. We perform a combined analysis of data
from oscillation experiments with the neutrino scattering experiments CHARM and
NuTeV. We find that the degeneracy can be lifted if the non-standard neutrino
interactions take place with down quarks, but it remains for up quarks.
However, CHARM and NuTeV constraints apply only if the new interactions take
place through mediators not much lighter than the electroweak scale. For light
mediators we consider the possibility to resolve the degeneracy by using data
from future coherent neutrino-nucleus scattering experiments. We find that, for
an experiment using a stopped-pion neutrino source, the LMA-Dark degeneracy
will either be resolved, or the presence of new interactions in the neutrino
sector will be established with high significance.Comment: 33 pages, 9 figures. Minor modifications. Version accepted for
  publication in JHE
Electroweak symmetry breaking and collider signatures in the
  next-to-minimal composite Higgs model

We conduct a detailed numerical analysis of the composite
pseudo-Nambu-Goldstone Higgs model based on the next-to-minimal coset
$\text{SO}(6)/\text{SO}(5)\cong\text{SU}(4)/\text{Sp}(4)$, featuring an
additional SM singlet scalar in the spectrum, which we allow to mix with the
Higgs boson. We identify regions in parameter space compatible with all current
experimental constraints, including radiative electroweak symmetry breaking,
flavour physics, and direct searches at colliders. We find the additional
scalar, with a mass predicted to be below a TeV, to be virtually unconstrained
by current LHC data, but potentially in reach of run 2 searches. Promising
indirect searches include rare semi-leptonic $B$ decays, CP violation in $B_s$
mixing, and the electric dipole moment of the neutron.Comment: 32 pages + appendices, 9 figures. v2: minor clarifications, matches
  the JHEP versio