pinecone/core-2020-05-10-deduplication huggingface dataset:
A Non-Abelian Vortex Lattice in Strongly Coupled Systems

The AdS/CFT correspondence predicts that background non-abelian magnetic
fields induce instabilities in strongly-coupled systems with non-abelian global
symmetries. These instabilities lead to the formation of vortex lattices in
which the non-abelian currents "antiscreen" the applied magnetic field. From
the bulk perspective, this behaviour can be traced to a well-known instability
of Yang-Mills theory. We analyse the phase structure of the instability and
comment on aspects of the vortex lattice.Comment: 13 pages. Version to appear in JHE
U-folds as K3 fibrations

We study N=2 four-dimensional flux vacua describing intrinsic
non-perturbative systems of 3 and 7 branes in type IIB string theory. The
solutions are described as compactifications of a G(ravity) theory on a Calabi
Yau threefold which consists of a fibration of an auxiliary K3 surface over an
S^2 base. In the spirit of F-theory, the complex structure of the K3 surface
varying over the base codifies the details of the fluxes, the dilaton and the
warp factors in type IIB string theory. We discuss in detail some simple
examples of geometric and non-geometric solutions where the precise
flux/geometry dictionary can be explicitly worked out. In particular, we
describe non-geometric T-fold solutions exhibiting non-trivial T-duality
monodromies exchanging 3- and 7-branes.Comment: 30 pages, 4 figures, v2: typos corrected, comments added, references
  adde
Supersymmetric Renyi Entropy

We consider 3d N>= 2 superconformal field theories on a branched covering of
a three-sphere. The Renyi entropy of a CFT is given by the partition function
on this space, but conical singularities break the supersymmetry preserved in
the bulk. We turn on a compensating R-symmetry gauge field and compute the
partition function using localization. We define a supersymmetric observable,
called the super Renyi entropy, parametrized by a real number q. We show that
the super Renyi entropy is duality invariant and reduces to entanglement
entropy in the q -> 1 limit. We provide some examples.Comment: 39 pages, 4 figure
Flavor of Gluino Decay in High-Scale Supersymmetry

The discovery of the Higgs boson with a mass of about 125 GeV intimates us a
possibility of a high-scale supersymmetry (SUSY) breaking model, where a
sfermion mass scale is much higher than the electroweak scale. Although a
general SUSY standard model can contribute to the low-energy flavor and/or
CP-violating processes, the high-scale SUSY breaking model provides smaller
signatures and therefore are less constrained, even in the presence of large
flavor/CP violations of sfermions. However, a manner of gluino decay directly
reflects the squark flavor structure and provides us a clue for the sfermion
flavor structure. In this paper, we study the gluino decay in detail and
discuss the interplay with the gluino decay and low-energy flavor and CP
observation.Comment: 31 pages, 9 figure
Two-Component Dark Matter

We study an extension of the Standard Model (SM) with two interacting cold
Dark Matter (DM) candidates: a neutral Majorana fermion ($\nu$) and a neutral
scalar singlet ($\varphi$). The scalar $\varphi$ interacts with the SM through
the "Higgs portal" coupling while $\nu$ at the tree level interacts only with
$\varphi$ through Yukawa interactions. The relic abundance of $\nu$ and
$\varphi$ is found by solving the Boltzmann equations numerically; for the case
$m_\nu > m_\varphi$ we also derive a reliable approximate analytical solution.
Effects of the interaction between the two DM components are discussed. A scan
over the parameter space is performed to determine the regions consistent with
the WMAP data for DM relic abundance, and with the XENON100 direct detection
limits for the DM-nucleus cross section. We find that although a large region
of the parameter space is allowed by the WMAP constraints, the XENON100 data
severely restricts the parameter space. Taking into account only amplitudes
generated at the tree level one finds three allowed regions for the scalar
mass: $m_\varphi \sim 62.5$ GeV (corresponding to the vicinity of the Higgs
boson resonance responsible for $\varphi\varphi$ annihilation into SM
particles), $m_\varphi \simeq 130-140$ GeV and $m_\varphi \gesim 3 $TeV. 1-loop
induced $\nu$-nucleon scattering has been also calculated and discussed. A
possibility of DM direct detection by the CREST-II experiment was considered.Comment: 22 pages, 17 figures; v2: references added, published in JHEP, v3:
  misspelled authors name correcte
Construction of an asymptotic S matrix for perturbative quantum gravity

The infrared behavior of perturbative quantum gravity is studied using the
method developed for QED by Faddeev and Kulish. The operator describing the
asymptotic dynamics is derived and used to construct an IR-finite S matrix and
space of asymptotic states. All-orders cancellation of IR divergences is shown
explicitly at the level of matrix elements for the example case of
gravitational potential scattering. As a practical application of the
formalism, the soft part of a scalar scattering amplitude is related to the
gravitational Wilson line and computed to all orders.Comment: 34 pages, 8 figure
Light top partners and precision physics

We analyze the corrections to the precision EW observables in minimal
composite Higgs models by using a general effective parametrization which also
includes the lightest fermionic resonances. A new, possibly large,
logarithmically divergent contribution to S is identified, which comes purely
from the strong dynamics. It can be interpreted as a running of S induced by
the non-renormalizable Higgs interactions due to the non-linear sigma-model
structure. As expected, the corrections to the T parameter coming from fermion
loops are finite and dominated by the contributions of the lightest composite
states. The fit of the oblique parameters suggests a rather stringent lower
bound on the sigma-model scale f > 750GeV. The corrections to the Z bL bL
vertex coming from the lowest-order operators in the effective Lagrangian are
finite and somewhat correlated to the corrections to T. Large additional
contributions are generated by contact interactions with 4 composite fermions.
In this case a logarithmic divergence can be generated and the correlation with
T is removed. We also analyze the tree-level corrections to the top couplings,
which are expected to be large due to the sizable degree of compositeness of
the third generation quarks. We find that for a moderate amount of tuning the
deviation in Vtb can be of order 5% while the distortion of the Z tL tL vertex
can be 10%.Comment: 55 pages. V2: Typos corrected and references added. Matches published
  versio
Stability of Bianchi attractors in Gauged Supergravity

In this paper, we analyse the stability of extremal black brane horizons with
homogeneous symmetry in the spatial directions in five dimensional gauged
supergravity, under the fluctuations of the scalar fields about their attractor
values. We examine the scalar fluctuation equations at the linearised level and
demand that the fluctuations vanish as one approaches the horizon. Imposing
certain restrictions on the Killing vectors used for gauging we find that the
necessary conditions for stability are satisfied only by a subclass of the
Bianchi metrics whose symmetry group factorises into a two dimensional Lifshitz
symmetry and any homogeneous symmetry group given by the Bianchi
classification. We apply these results to a simple example of a gauged
supergravity model with one vector multiplet to find the stable attractors.Comment: 25 pages, V2 minor changes, added discussions on gauge field and
  metric fluctuation
Measurement of the production cross section for Zγ→νν¯γ in pp collisions at s√=7 TeV and limits on ZZγ and Zγγ triple gauge boson couplings

A measurement of the Zγ→νν¯γ cross section in pp collisions at s√=7 TeV is presented, using data corresponding to an integrated luminosity of 5.0 fb−1 collected with the CMS detector. This measurement is based on the observation of events with an imbalance of transverse energy in excess of 130 GeV and a single photon in the absolute pseudorapidity range |η| < 1.4 with transverse energy above 145 GeV. The Zγ→νν¯γ production cross section is measured to be 21.1 ± 4.2 (stat.) ± 4.3 (syst.) ± 0.5 (lum.) fb, which agrees with the standard model prediction of 21.9 ± 1.1 fb. The results are combined with the CMS measurement of Zγ production in the ℓ + ℓ − γ final state (where ℓ is an electron or a muon) to yield the most stringent limits to date on triple gauge boson couplings: ∣∣hZ3∣∣<2.7×10−3 , ∣∣hZ4∣∣<1.3×10−5 for ZZγ and ∣∣hγ3∣∣<2.9×10−3 , ∣∣hγ4∣∣<1.5×10−5 for Zγγ couplings
Holonomy spin foam models: Asymptotic geometry of the partition function

We study the asymptotic geometry of the spin foam partition function for a
large class of models, including the models of Barrett and Crane, Engle,
Pereira, Rovelli and Livine, and, Freidel and Krasnov.
  The asymptotics is taken with respect to the boundary spins only, no
assumption of large spins is made in the interior. We give a sufficient
criterion for the existence of the partition function. We find that geometric
boundary data is suppressed unless its interior continuation satisfies certain
accidental curvature constraints. This means in particular that most Regge
manifolds are suppressed in the asymptotic regime. We discuss this explicitly
for the case of the configurations arising in the 3-3 Pachner move. We identify
the origin of these accidental curvature constraints as an incorrect twisting
of the face amplitude upon introduction of the Immirzi parameter and propose a
way to resolve this problem, albeit at the price of losing the connection to
the SU(2) boundary Hilbert space.
  The key methodological innovation that enables these results is the
introduction of the notion of wave front sets, and the adaptation of tools for
their study from micro local analysis to the case of spin foam partition
functions.Comment: 63 pages, 5 figures v2: Reference correcte
Measurement of the W-boson helicity in top-quark decays from tt¯ production in lepton+jets events in pp collisions at s√=7 TeV

The W-boson helicity fractions in top-quark decays are measured with tt¯ events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb−1. The measured fractions of longitudinal, left-, and right-handed helicity are F 0 = 0.682 ± 0.030 (stat.) ± 0.033 (syst.), F L = 0.310 ± 0.022 (stat.) ± 0.022 (syst.), and F R = 0.008 ± 0.012 (stat.) ± 0.014 (syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings g L , g R are also derived
Perturbative 3-charge microstate geometries in six dimensions

We construct a set of supersymmetric geometries that represent regular
microstates of the D1-D5-P 3-charge system, using the solution generating
technique of hep-th/0311092. These solutions are constructed as perturbations
around the maximally rotating D1-D5 solution at the linear order, and depend on
the coordinate of S^1 on which the D1- and D5-branes are wrapped. In the
framework of six-dimensional supergravity developed by Gutowski, Martelli and
Reall [hep-th/0306235], these solutions have a 4-dimensional base that depend
on the S^1 coordinate v. The v-dependent base is expected of the superstratum
solutions which are parametrized by arbitrary surfaces, and these solutions
give a modest step toward their explicit construction.Comment: 25 pages. v4: a typo correcte
Anomalous Dimensions and Non-Gaussianity

We analyze the signatures of inflationary models that are coupled to strongly
interacting field theories, a basic class of multifield models also motivated
by their role in providing dynamically small scales. Near the squeezed limit of
the bispectrum, we find a simple scaling behavior determined by operator
dimensions, which are constrained by the appropriate unitarity bounds.
Specifically, we analyze two simple and calculable classes of examples:
conformal field theories (CFTs), and large-N CFTs deformed by relevant
time-dependent double-trace operators. Together these two classes of examples
exhibit a wide range of scalings and shapes of the bispectrum, including nearly
equilateral, orthogonal and local non-Gaussianity in different regimes. Along
the way, we compare and contrast the shape and amplitude with previous results
on weakly coupled fields coupled to inflation. This signature provides a
precision test for strongly coupled sectors coupled to inflation via irrelevant
operators suppressed by a high mass scale up to 1000 times the inflationary
Hubble scale.Comment: 40 pages, 10 figure
Measuring the Mass Hierarchy with Muon and Hadron Events in Atmospheric
  Neutrino Experiments

Neutrino mass hierarchy can be measured in atmospheric neutrino experiments
through the observation of earth matter effects. Magnetized iron calorimeters
have been shown to be good in this regard due to their charge identification
capabilities. The charged current interaction of $\nu_\mu$ in this detector,
produces a muon track and a hadron shower. The direction of the muon track can
be measured very accurately. We show the improvement expected in the reach of
this class of experiments to the neutrino mass hierarchy, as we improve the
muon energy resolution and the muon reconstruction efficiency. We next propose
to include the hadron events in the analysis, by tagging them with the zenith
angle of the corresponding muon and binning the hadron data first in energy and
then in zenith angle. To the best of our knowledge this way of performing the
analysis of the atmospheric neutrino data has not be considered before. We show
that the hadron events increase the mass hierarchy sensitivity of the
experiment. Finally, we show the expected mass hierarchy sensitivity in terms
of the reconstructed neutrino energy and zenith angle. We show how the detector
resolutions spoil the earth matter effects in the neutrino channel and argue
why the sensitivity obtained from the neutrino analysis cannot be significantly
better than that obtained from the analysis using muon data alone. As a result,
the best mass hierarchy sensitivity is obtained when we add the contribution of
the muon and the hadron data. For $\sin^22\theta_{13}=0.1$,
$\sin^2\theta_{23}=0.5$, a muon energy resolution of 2\%, reconstruction
efficiency of 80\% and exposure of $50\times 10$ kton-year, we could get up to
$4.5\sigma$ signal for the mass hierarchy from combining the muon and hadron
data.Comment: 29 page
Baryogenesis and Dark Matter with Vector-like Fermions

We show that vector-like fermions can act as the dark matter candidate in the
universe whilst also playing a crucial role in electroweak baryogenesis through
contributing to the barrier in the one-loop thermal scalar potential. In order
for the new fermions to give rise to a strong first order phase transition, we
show that one requires rather large Yukawa couplings in the new sector, which
are strongly constrained by electroweak precision tests and perturbativity.
Strong couplings between the dark matter candidate and the Higgs boson
intuitively lead to small values of the relic density and problems with dark
matter direct detection bounds. Nevertheless, when considering the most general
realisation of the model, we find regions in the parameter space that respect
all current constraints and may explain both mysteries simultaneously.Comment: 21 pages, 11 figures, references added, includes discussion of vacuum
  stability, matches published versio
Strings in compact cosmological spaces

We confront the problem of giving a fundamental definition to perturbative
string theory in spacetimes with totally compact space (taken to be a torus for
simplicity, though the nature of the problem is very general) and non-compact
time. Due to backreaction induced by the presence of even a single string
quantum, the usual formulation of perturbative string theory in a fixed
classical background is infrared-divergent at all subleading orders in the
string coupling, and needs to be amended. The problem can be seen as a closed
string analogue of D0-brane recoil under an impact by closed strings (a
situation displaying extremely similar infrared divergences). Inspired by the
collective coordinate treatment of the D0-brane recoil, whereby the
translational modes of the D0-brane are introduced as explicit dynamical
variables in the path integral, we construct a similar formalism for the case
of string-induced gravitational backreaction, in which the spatially uniform
modes of the background fields on the compact space are quantized explicitly.
The formalism can equally well be seen as an ultraviolet completion of a
minisuperspace quantum cosmology with string degrees of freedom. We consider
the amplitudes for the universe to have two cross-sections with specified
spatial properties and string contents, and show (at the first non-trivial
order) that they are finite within our formalism.Comment: 37 pages, 4 figures; v2: cosmetic changes, published versio
Exact results in N=2 gauge theories

We derive exact formulae for the partition function and the expectation
values of Wilson/'t Hooft loops, thus directly checking their S-duality
transformations. We focus on a special class of N=2 gauge theories on S^4 with
fundamental matter. In particular we show that, for a specific choice of the
masses, the matrix model integral defining the gauge theory partition function
localizes around a finite set of critical points where it can be explicitly
evaluated and written in terms of generalized hypergeometric functions. From
the AGT perspective the gauge theory partition function, evaluated with this
choice of masses, is viewed as a four point correlator involving the insertion
of a degenerated field. The well known simplicity of the degenerated correlator
reflects the fact that for these choices of masses only a very restrictive type
of instanton configurations contributes to the gauge theory partition function.Comment: 30 pages, 4 figures. reference added, typos corrected. version
  accepted for publication on JHE
non-BPS walls of marginal stability

We explore the properties of non-BPS multi-centre extremal black holes in
ungauged N=2 supergravity coupled to n_v vector multiplets, as described by
solutions to the composite non-BPS linear system. After setting up an explicit
description that allows for arbitrary non-BPS charges to be realised at each
centre, we study the structure of the resulting solutions. Using these results,
we prove that the binding energy of the composite is always positive and we
show explicitly the existence of walls of marginal stability for generic
choices of charges. The two-centre solutions only exist on a hypersurface of
dimension n_v+1 in moduli space, with an n_v-dimensional boundary, where the
distance between the centres diverges and the binding energy vanishes.Comment: 54 pages, 1 figur
Constraints on 2d CFT partition functions

Modular invariance is known to constrain the spectrum of 2d conformal field
theories. We investigate this constraint systematically, using the linear
functional method to put new improved upper bounds on the lowest gap in the
spectrum. We also consider generalized partition functions of N = (2,2)
superconformal theories and discuss the application of our results to
Calabi-Yau compactifications. For Calabi-Yau threefolds with no enhanced
symmetry we find that there must always be non-BPS primary states of weight 0.6
or less.Comment: 41 pages, 5 figure
The holographic dilaton

We study a set of examples of holographic duals to theories with spontaneous
breaking of conformal invariance in different dimensions. The geometries are
domain walls interpolating between two AdS spaces, with a non-trivial
background scalar field dual to a relevant operator. We comment on a subtlety
in the low momentum expansion pointed out in arXiv:1304.3051 for the case of
background gravity and revise the dynamical gravity results of arXiv:1207.0006,
where the dilaton pole was missing in the scalar-scalar and tensor-tensor
two-point functions. We compute the energy-momentum tensor and scalar two-point
functions and show that there is indeed a massless dilaton pole.Comment: 28 pages. v2: references added. v3: published version in JHE
Exact asymptotically flat charged hairy black holes with a dilaton
  potential

We find broad classes of exact 4-dimensional asymptotically flat black hole
solutions in Einstein-Maxwell theories with a non-minimally coupled dilaton and
its non-trivial potential. We consider a few interesting limits, in particular,
a regular generalization of the dilatonic Reissner-Nordstr{\"o}m solution and,
also, smooth deformations of supersymmetric black holes. Further examples are
provided for more general dilaton potentials. We discuss the thermodynamical
properties and show that the first law is satisfied. In the non-extremal case
the entropy depends, as expected, on the asymptotic value of the dilaton. In
the extremal limit, the entropy is determined purely in terms of charges and is
independent of the asymptotic value of the dilaton. The attractor mechanism can
be used as a criterion for the existence of the regular solutions. Since there
is a `competition' between the effective potential and dilaton potential, we
also obtain regular extremal black hole solutions with just one U(1) gauge
field turned on.Comment: 19 pages, no figures; v2: comments and refs. added, matches the
  published versio
Chiral conductivities and effective field theory

We construct the three-dimensional effective field theory which reproduces
low-momentum static correlation functions in four-dimensional quantum field
theories with U(1) axial anomalies and a dynamical vector gauge field, in
thermal equilibrium. We compute radiative corrections to parity-violating
chiral conductivities, to leading order in the effective theory. All of the
anomaly-induced transport is susceptible to radiative corrections, except for
certain two-point functions which are required by symmetry to vanish.Comment: 53 pages, 2 figure
Matching Squark Pair Production at NLO with Parton Showers

The pair production of squarks is one of the main search channels for
supersymmetry at the LHC. We present a fully differential calculation of the
next-to-leading order (NLO) SUSY-QCD corrections to the on-shell production of
a pair of squarks in the Minimal Supersymmetric Standard Model (MSSM),
supplemented by the leading-order decay of the squarks to the lightest
neutralino and a quark. In addition, we use the Powheg method to match our NLO
calculation with parton showers. To this end, the process was implemented in
the Powheg-Box framework and interfaced with Pythia6 and Herwig++. We study the
differential scale dependence and K-factors, and investigate the effects of the
parton showers for a benchmark scenario in the constrained MSSM.Comment: 42 pages, 21 figures, reference added, minor typos corrected, version
  accepted by JHE