pinecone/core-2020-05-10-deduplication huggingface dataset:
Light Sterile Neutrinos in Cosmology and Short-Baseline Oscillation
  Experiments

We analyze the most recent cosmological data, including Planck, taking into
account the possible existence of a sterile neutrino with a mass at the eV
scale indicated by short-baseline neutrino oscillations data in the 3+1
framework. We show that the contribution of local measurements of the Hubble
constant induces an increase of the value of the effective number of
relativistic degrees of freedom above the Standard Model value, giving an
indication in favor of the existence of sterile neutrinos and their
contribution to dark radiation. Furthermore, the measurements of the local
galaxy cluster mass distribution favor the existence of sterile neutrinos with
eV-scale masses, in agreement with short-baseline neutrino oscillations data.
In this case there is no tension between cosmological and short-baseline
neutrino oscillations data, but the contribution of the sterile neutrino to the
effective number of relativistic degrees of freedom is likely to be smaller
than one. Considering the Dodelson-Widrow and thermal models for the
statistical cosmological distribution of sterile neutrinos, we found that in
the Dodelson-Widrow model there is a slightly better compatibility between
cosmological and short-baseline neutrino oscillations data and the required
suppression of the production of sterile neutrinos in the early Universe is
slightly smaller.Comment: 12 pages; final version published in JHEP 1311 (2013) 21
Pure Spinor b-ghost in a Super-Maxwell Background

In the pure spinor formalism for the superstring, the b-ghost is a composite
operator satisfying {Q,b}=T where Q is the pure spinor BRST operator and T is
the holomorphic stress tensor. The b-ghost is holomorphic in a flat
target-space background, but it is not holomorphic in a generic curved
target-space background and instead satisfies $\bar\partial b$ = [Q, \Omega]
for some \Omega. In this paper, \Omega\ is explicitly constructed for the case
of an open superstring in a super-Maxwell background.Comment: 20 page
Second-order partition function of a non-interacting chiral fluid in 3+1
  dimensions

We compute the partition function for non-interacting chiral fermions at
second order in a derivative expansion of an arbitrary time-independent
gravitational and gauge background. We find that Pauli-Villars regularization
of the vacuum part is needed to get consistent results. We use our results to
discuss some features of the non-dissipative constitutive relations of second
order hydrodynamics.Comment: 27 pages; v2 minor changes in sec. 5 and discussion improved in secs.
  6 and 7, references added, version to appear in JHE
Black Holes in the 3D Higher Spin Theory and Their Quasi Normal Modes

We present a class of 3D Black Holes based on flat connections which are
polynomials in the BTZ $hs(\lambda) \times hs(\lambda)$-valued connection. We
solve analytically the fluctuation equations of matter in their background and
find the spectrum of their Quasi Normal Modes. We analyze the bulk to boundary
two-point functions. We also relate our results and those arising in other
backgrounds discussed recently in the literature on the subject.Comment: v3: typo corrected in first line of Eq (4.2), improved presentatio
A modulated shear to entropy ratio

We study correlation functions in an equilibrated spatially modulated phase
of Einstein-Maxwell two-derivative gravity. We find that the ratio of the
appropriate low frequency limit of the stress-stress two point function to the
entropy density is modulated. The conductivity, the stress-current and
current-stress correlation functions are also modulated. At temperatures close
to the phase transition we obtain analytic expressions for some of the
correlation functions.Comment: 38 pages, 2 figures; v2: added reference, minor correctio
Non-existence of supersymmetric AdS 5 black rings

It has been proven in arXiv:1303.0853 that all regular supersymmetric near-horizon geometries in minimal five-dimensional gauged supergravity admit automatic supersymmetry enhancement. Using this result, the integrability conditions associated with the existence of the additional supersymmetry are analysed, and the near-horizon geometries are determined explicitly. We show that they all correspond to previously constructed examples. Hence, there are no supersymmetric black ring solutions in minimal five-dimensional gauged supergravity
Improving estimates of the number of ‘fake’ leptons and other mis-reconstructed objects in hadron collider events: BoB’s your UNCLE

We consider current and alternative approaches to setting limits on new physics signals having backgrounds from misidentified objects; for example jets misidentified as leptons, b -jets or photons. Many ATLAS and CMS analyses have used a heuristic “matrix method” for estimating the background contribution from such sources. We demonstrate that the matrix method suffers from statistical shortcomings that can adversely affect its ability to set robust limits. A rigorous alternative method is discussed, and is seen to produce fake rate estimates and limits with better qualities, but is found to be too costly to use. Having investigated the nature of the approximations used to derive the matrix method, we propose a third strategy that is seen to marry the speed of the matrix method to the performance and physicality of the more rigorous approach
Improving estimates of the number of fake leptons and other mis-reconstructed objects in hadron collider events: BoB's your UNCLE

We consider current and alternative approaches to setting limits on new physics signals having backgrounds from misidentified objects; for example jets misidentified as leptons, b-jets or photons. Many ATLAS and CMS analyses have used a heuristic “matrix method” for estimating the background contribution from such sources. We demonstrate that the matrix method suffers from statistical shortcomings that can adversely affect its ability to set robust limits. A rigorous alternative method is discussed, and is seen to produce fake rate estimates and limits with better qualities, but is found to be too costly to use. Having investigated the nature of the approximations used to derive the matrix method, we propose a third strategy that is seen to marry the speed of the matrix method to the performance and physicality of the more rigorous approach.This is the final published version. It is available online from Springer in the Journal of High Energy Physics here: http://link.springer.com/article/10.1007/JHEP11(2014)031
An axial gauge ansatz for higher spin theories

We present an ansatz which makes the equations of motion more tractable for
the simplest of Vasiliev's four-dimensional higher spin theories. The ansatz is
similar to axial gauge in electromagnetism. We present a broad class of
solutions in the gauge where the spatial connection vanishes, and we discuss
the lift of one of these solutions to a full spacetime solution via a gauge
transformation.Comment: 12 pages. v2: Noted a complication with spacetime interpretation. v3:
  Revised section 4, correcting a limiting proces
Phase structure of the N=1 supersymmetric Yang-Mills theory at finite
  temperature

Supersymmetry (SUSY) has been proposed to be a central concept for the
physics beyond the standard model and for a description of the strong
interactions in the context of the AdS/CFT correspondence. A deeper
understanding of these developments requires the knowledge of the properties of
supersymmetric models at finite temperatures. We present a Monte Carlo
investigation of the finite temperature phase diagram of the N=1 supersymmetric
Yang-Mills theory (SYM) regularised on a space-time lattice. The model is in
many aspects similar to QCD: quark confinement and fermion condensation occur
in the low temperature regime of both theories. A comparison to QCD is
therefore possible. The simulations show that for N=1 SYM the deconfinement
temperature has a mild dependence on the fermion mass. The analysis of the
chiral condensate susceptibility supports the possibility that chiral symmetry
is restored near the deconfinement phase transition.Comment: 26 pages, 12 figure
Real space renormalization group for twisted lattice N=4 super
  Yang-Mills

A necessary ingredient for our previous results on the form of the long
distance effective action of the twisted lattice N=4 super Yang-Mills theory is
the existence of a real space renormalization group which preserves the lattice
structure, both the symmetries and the geometric interpretation of the fields.
In this brief article we provide an explicit example of such a blocking scheme
and illustrate its practicality in the context of a small scale Monte Carlo
renormalization group calculation. We also discuss the implications of this
result, and the possible ways in which to use it in order to obtain further
information about the long distance theory.Comment: 15 pages, 3 figure
Logarithmic Corrections to Extremal Black Hole Entropy in N = 2, 4 and 8
  Supergravity

We compute the logarithmic correction to black hole entropy about
exponentially suppressed saddle points of the Quantum Entropy Function
corresponding to Z(N) orbifolds of the near horizon geometry of the extremal
black hole under study. By carefully accounting for zero mode contributions we
show that the logarithmic contributions for quarter--BPS black holes in N=4
supergravity and one--eighth BPS black holes in N=8 supergravity perfectly
match with the prediction from the microstate counting. We also find that the
logarithmic contribution for half--BPS black holes in N = 2 supergravity
depends non-trivially on the Z(N) orbifold. Our analysis draws heavily on the
results we had previously obtained for heat kernel coefficients on Z(N)
orbifolds of spheres and hyperboloids in arXiv:1311.6286 and we also propose a
generalization of the Plancherel formula to Z(N) orbifolds of hyperboloids to
an expression involving the Harish-Chandra character of SL(2,R), a result which
is of possible mathematical interest.Comment: 40 page
Schr\"odinger functional boundary conditions and improvement for N>3

The standard method to calculate non-perturbatively the evolution of the
running coupling of a SU(N) gauge theory is based on the Schr\"odinger
functional (SF). In this paper we construct a family of boundary fields for
general values of N which enter the standard definition of the SF coupling. We
provide spatial boundary conditions for fermions in several representations
which reduce the condition number of the squared Dirac operator. In addition,
we calculate the O(a) improvement coefficients for N>3 needed to remove
boundary cutoff effects from the gauge action. After this, residual cutoff
effects on the step scaling function are shown to be very small even when
considering non-fundamental representations. We also calculate the ratio of
Lambda parameters between the MS-bar and SF schemes.Comment: 33 pages, 6 figure
On the ABJM four-point amplitude at three loops and BDS exponentiation

We study the three-loop four-point amplitude in ABJM theory. We determine the
dual conformal invariant integrals with highest number of propagators and fix
their coefficients by two-particle cuts. Evaluating such a combination of
integrals in dimensional regularization we provide evidence for exponentiation
of the amplitude, including the finite terms. In addition we show that the
three-loop amplitude can be expressed in terms of classical polylogarithms of
uniform degree of transcendentality.Comment: 31 pages, 4 figure
Soft gluon resummation for gluon-induced Higgs Strahlung

We study the effect of soft gluon emission on the total cross section predictions for the gg → HZ associated Higgs production process at the LHC. To this end, we perform resummation of threshold corrections at the NLL accuracy in the absolute threshold production limit and in the threshold limit for production of a ZH system with a given invariant mass. Analytical results and numerical predictions for various possible LHC collision energies are presented. The perturbative stability of the results is verified by including universal NNLL effects. We find that resummation significantly reduces the scale uncertainty of the gg → HZ contribution, which is the dominant source of perturbative uncertainty to ZH production. We use our results to evaluate updated numbers for the total inclusive cross section of associated pp → ZH production at the LHC. The reduced scale uncertainty of the gg → HZ component translates into a decrease of the overall scale error by about a factor of two
The dark side of θ 13 , δ CP , leptogenesis and inflation in type-I seesaw

In the context of the type-I seesaw mechanism, it is known that θ 13 is zero and leptogenesis can not be realized if there exists a residual flavor symmetry resulting in the Tri-Bimaximal neutrino mixing pattern. We propose a simple framework where additional particles, odd under a Z 2 symmetry, break the residual flavor symmetry and the lightest of the Z 2 odd particles is the dark matter candidate. As as result, nonzero θ 13 , δ CP , leptogenesis and the correct dark matter density can be accommodated. On the other hand, a Z 2 odd scalar can play the role of the inflaton with mass of 10 13 GeV motivated by the recent BICEP2 results. Interestingly, the model can “generate” δ CP ≃ − π/ 2, preferred by the T2K experiment in the normal hierarchy neutrino mass spectrum
Worldline approach to the Grosse-Wulkenhaar model

We apply the worldline formalism to the Grosse-Wulkenhaar model and obtain an expression for the one-loop effective action which provides an efficient way for computing Schwinger functions in this theory. Using this expression we obtain the quantum corrections to the effective background and the β -functions, which are known to vanish at the self-dual point. The case of degenerate noncommutativity is also considered. Our main result can be straightforwardly applied to any polynomial self-interaction of the scalar field and we consider that the worldline approach could be useful for studying effective actions of noncommutative gauge fields as well as in other non-local models or in higher-derivative field theories
Generalized Gradient Flow Equation and Its Application to Super
  Yang-Mills Theory

We generalize the gradient flow equation for field theories with nonlinearly
realized symmetry. Applying the formalism to super Yang-Mills theory, we
construct a supersymmetric extension of the gradient flow equation. It can be
shown that the super gauge symmetry is preserved in the gradient flow.
Furthermore, choosing an appropriate modification term to damp the gauge
degrees of freedom, we obtain a gradient flow equation which is closed within
the Wess-Zumino gauge.Comment: 35 pages, v2: typos corrected and references added, v3: published
  versio
On D-brane moduli stabilisation

Standard results in 4d N = 1 $$ \mathcal{N}=1 $$ string compactifications assign a number of moduli to each space-time filling D-brane, computed by analysing the D-brane action in a fixed background. We revisit such conventional wisdom and argue that this naive counting of open string moduli is incorrect, in the sense that some of them will be lifted when making dynamical the bulk degrees of freedom. We explicitly discuss this effect for D6-branes wrapping special Lagrangian three-cycles, showing that some geometric and Wilson line moduli are lifted even before taking into account worldsheet instanton effects. From a 4d effective theory viewpoint the moduli lifting is due to an F-term potential, and can be deduced from the superpotentials in the literature. From a microscopic viewpoint the lifting is due to D-brane backreaction effects and flux quantisation in a compact manifold, and provides a mechanism for lifting Wilson line moduli. The latter applies to certain D6-branes and D7-brane Wilson lines, yielding new possibilities to build models of inflation in string theory
Noncommutative Chern-Simons gauge and gravity theories and their
  geometric Seiberg-Witten map

We use a geometric generalization of the Seiberg-Witten map between
noncommutative and commutative gauge theories to find the expansion of
noncommutative Chern-Simons (CS) theory in any odd dimension $D$ and at first
order in the noncommutativity parameter $\theta$. This expansion extends the
classical CS theory with higher powers of the curvatures and their derivatives.
  A simple explanation of the equality between noncommutative and commutative
CS actions in $D=1$ and $D=3$ is obtained. The $\theta$ dependent terms are
present for $D\geq 5$ and give a higher derivative theory on commutative space
reducing to classical CS theory for $\theta\to 0$. These terms depend on the
field strength and not on the bare gauge potential.
  In particular, as for the Dirac-Born-Infeld action, these terms vanish in the
slowly varying field strength approximation: in this case noncommutative and
commutative CS actions coincide in any dimension.
  The Seiberg-Witten map on the $D=5$ noncommutative CS theory is explored in
more detail, and we give its second order $\theta$-expansion for any gauge
group. The example of extended $D=5$ CS gravity, where the gauge group is
$SU(2,2)$, is treated explicitly.Comment: 18 pages, LaTeX. Added clarifications, added reference. Matches
  published version on JHE
The gradient flow of the Dirac spectrum

We construct chiral perturbation theory for the gradient flow of the
microscopic Dirac eigenvalues and compute the density of and correlations
between the microscopic eigenvalues at zero and non-zero flow time. The results
show that the repulsion of the microscopic Dirac eigenvalues from the dynamical
quark mass decreases with increasing gradient flow time. Furthermore, the flow
of the spectral resolvent is compared to the flow of the chiral condensate
obtained from a fermionic gradient flow.Comment: 24 pages, 3 figure
Higher spins in AdS 5 at one loop: vacuum energy, boundary conformal anomalies and AdS/CFT

We consider general-symmetry higher spin fields in AdS 5 and derive the expressions for their one-loop corrections to vacuum energy E c and the associated 4d boundary conformal anomaly a-coefficient. We propose a similar expression for the second conformal anomaly c-coefficient. We show that all the three quantities ( E c , a , c) computed for N = 8 $$ \mathcal{N}=8 $$ gauged 5d supergravity are equal to − 1 2 $$ -\frac{1}{2} $$ of their values for N = 4 $$ \mathcal{N}=4 $$ conformal 4d supergravity and also to twice the values for N = 4 $$ \mathcal{N}=4 $$ Maxwell multiplet. This gives a 5d derivation of the fact that the system of N = 4 $$ \mathcal{N}=4 $$ conformal supergravity and four N = 4 $$ \mathcal{N}=4 $$ Maxwell multiplets is anomaly free. The values of ( E c , a , c) for the states at level p of Kaluza-Klein tower of 10d type IIB supergravity compactified on S 5 turn out to be equal to those for p copies of N = 4 $$ \mathcal{N}=4 $$ Maxwell multiplets. This may be related to the fact that these states appear in the tensor product of p superdoubletons. Under a natural regularization of the sum over p , the full 10d supergravity contribution is then minus that of one Maxwell multiplet, in agreement with the standard adjoint AdS/CFT duality (SU( N ) SYM contribution is N 2 − 1 times that of one Maxwell multiplet). We also verify the matching of ( E c , a , c) for spin 0 and 1 2 $$ \frac{1}{2} $$ boundary theory cases of vectorial AdS/CFT duality. The consistency conditions for vectorial AdS/CFT turn out to be equivalent to the cancellation of anomalies in the closely related 4d conformal higher spin theories. In addition, we study novel example of the vectorial AdS/CFT duality when the boundary theory is described by free spin 1 fields and is dual to a particular higher spin theory in AdS 5 containing fields in mixed-symmetry representations. We also discuss its supersymmetric generalizations
Transverse momentum resummation for Higgs production via gluon fusion in
  the MSSM

The resummed transverse momentum distribution of supersymmetric Higgs bosons
produced through gluon fusion at NLO+NLL is presented, including the exact
quark and squark mass dependences. Considering various MSSM scenarios, we
compare our results to previous ones within the POWHEG approach. We analyze the
impact of the bottom loop which becomes the dominant contribution to the gluon
fusion cross section for a wide range of the parameter space for the
pseudo-scalar and heavy Higgs.Comment: 33 pages, 13 figure
Action Principles for Transgression and Chern-Simons AdS Gravities

Chern-Simons gravities are theories with a lagrangian given by a Chern-Simons
form constructed from a space-time gauge group. In previous investigations we
showed that, for some special field configurations that are solutions of the
field equations, the extension from Chern-Simons to Transgression forms as
lagrangians, motivated by gauge invariance, automatically yields the boundary
terms required to regularize the theory, giving finite conserved charges and
black hole thermodynamics. Further work by other researchers showed that one of
the action functionals considered in the above mentioned work yields a well
defined action principle in the metric (zero torsion) case and for
asymptotically Anti de Sitter (AdS) space-times. In the present work we
consider several action functionals for Chern-Simons AdS gravity constructed
from Transgression forms, and show the action principles to be well defined and
the Noether charges and Euclidean action to be finite for field configurations
satisfying only that the gauge field curvature (field strength) for the AdS
gauge group is asymptotically finite. For that purpose we consider an
asymptotic expansion of the vielbein and spin connection that may be regarded
as a perturbation of an AdS space-time, but allowing a non zero torsion. Our
results are of potential interest for Lovelock gravity theories, as it has been
shown that the boundary terms dictated by the transgressions for Chern-Simons
gravities are also suitable to regularize Lovelock theories.Comment: The review sections of the present paper may have some overlap with
  the work of the same author arXiv:1010.5110 (which has not been published in
  a journal). Version 2: Subsection 6.1 clarifying action principle added,
  references adde
Flato-Fronsdal theorem for higher-order singletons

We prove a generalized Flato-Fronsdal theorem for higher-order, scalar and spinor, singletons. In the resulting infinite tower of bulk higher-spin fields, we point out the occurrence of partially-massless fields of all depths. This leads us to conjecture a holographic duality between a higher-spin gravity theory around AdS d +1 with the aforementioned spectrum of fields, and a free CFT d of fundamental (higher-order) scalar and spinor singletons. As a first check of this conjecture, we find that the total Casimir energy vanishes at one loop
Analytic calculation of 1-jettiness in DIS at O(αs)

We present an analytic O(αs) calculation of cross sections in deep inelastic scattering (DIS) dependent on an event shape, 1-jettiness, that probes final states with one jet plus initial state radiation. This is the first entirely analytic calculation for a DIS event shape cross section at this order. We present results for the differential and cumulative 1-jettiness cross sections, and express both in terms of structure functions dependent not only on the usual DIS variables x, Q 2 but also on the 1-jettiness τ. Combined with previous results for log resummation, predictions are obtained over the entire range of the 1-jettiness distribution