pinecone/core-2020-05-10-deduplication huggingface dataset:
Collinear and Soft Limits of Multi-Loop Integrands in N=4 Yang-Mills

It has been argued in arXiv:1112.6432 that the planar four-point integrand in
N=4 super Yang-Mills theory is uniquely determined by dual conformal invariance
together with the absence of a double pole in the integrand of the logarithm in
the limit as a loop integration variable becomes collinear with an external
momentum. In this paper we reformulate this condition in a simple way in terms
of the amplitude itself, rather than its logarithm, and verify that it holds
for two- and three-loop MHV integrands for n>4. We investigate the extent to
which this collinear constraint and a constraint on the soft behavior of
integrands can be used to determine integrands. We find an interesting
complementarity whereby the soft constraint becomes stronger while the
collinear constraint becomes weaker at larger n. For certain reasonable choices
of basis at two and three loops the two constraints in unison appear strong
enough to determine MHV integrands uniquely for all n.Comment: 27 pages, 14 figures; v2: very minor change
Non-abelian Action for Multiple Five-Branes with Self-Dual Tensors

We construct an action for non-abelian 2-form in 6-dimensions. Our action
consists of a non-abelian generalization of the abelian action of Perry and
Schwarz for a single five-brane. It admits a self-duality equation on the field
strength as the equation of motion. It has a modified 6d Lorentz symmetry. On
dimensional reduction on a circle, our action gives the standard 5d Yang-Mills
action plus higher order corrections. Based on these properties, we propose
that our theory describes the gauge sector of multiple M5-branes in flat space.Comment: LaTeX, 26 pages. v2: improved discussion of Lorentz symmetry. ref
  added. v3: add comments in the discussion section on the inclusion of scalar
  fields and supersymmetry; title changed to a more suitable one; version
  published in JHE
Holographic Entanglement Entropy and Confinement

We study the phase transition in the holographic entanglement entropy for
various confining models. This transition occurs for the entanglement entropy
of a strip at a critical value of the strip width. Our main interest is to
examine the critical width for models with several parameters. For these
models, the critical width, the glueball mass and the string tension all become
functions of these two parameters. Comparing the behavior of the critical width
in the entanglement entropy and these other scales, we find that $l_c$ seems to
follow closely the deconfinement temperature and the glueball mass. The
behavior of the string tension is similar to $l_c$, despite of being
parametrically smaller than the other quantities.Comment: 19 pages, 4 figures. v2: references adde
Bubbling the Newly Grown Black Ring Hair

New families of BPS black ring solutions with four electric and four dipole
magnetic charges have recently been explicitly constructed and uplifted to
M-theory. These solutions were found to belong to a CFT with central charge
different compared to the one of the STU model. Because of their importance to
AdS/CFT, here we give the microstate description of these geometries in terms
of topological bubbles and supertubes. The fourth charge results in an
additional flux through the topological cycles that resolve the brane
singularities. The analog of these solutions in the IIB frame yield a
generalized regular supertube with three electric charges and one dipole
charge. Direct comparison is also made with the previously-known bubbled
geometries.Comment: 13 page
Gauged flavour symmetry for the light generations

We study the phenomenology of a model where an SU(2)^3 flavour symmetry
acting on the first two generation quarks is gauged and Yukawa couplings for
the light generations are generated by a see-saw mechanism involving heavy
fermions needed to cancel flavour-gauge anomalies. We find that, in constrast
to the SU(3)^3 case studied in the literature, most of the constraints related
to the third generation, like electroweak precision bounds or B physics
observables, can be evaded, while characteristic collider signatures are
predicted.Comment: 16 pages, 3 figure
Entanglement Entropy of 3-D Conformal Gauge Theories with Many Flavors

Three-dimensional conformal field theories (CFTs) of deconfined gauge fields coupled to gapless flavors of fermionic and bosonic matter describe quantum critical points of condensed matter systems in two spatial dimensions. An important characteristic of these CFTs is the finite part of the entanglement entropy across a circle. The negative of this quantity is equal to the finite part of the free energy of the Euclidean CFT on the three-sphere, and it has been proposed to satisfy the so called F-theorem, which states that it decreases under RG flow and is stationary at RG fixed points. We calculate the three-sphere free energy of non-supersymmetric gauge theory with a large number \(N_ {F}\) of bosonic and/or fermionic flavors to the first subleading order in \(1/N_ {F}\) . We also calculate the exact free energies of the analogous chiral and non-chiral \(\cal {N}=2\) supersymmetric theories using localization, and find agreement with the \(1/N_ {F}\)  expansion. We analyze some RG flows of supersymmetric theories, providing further evidence for the F-theorem.Physic
Black holes as incompressible fluids on the sphere

We consider finite deformations of the p + 2-dimensional Schwarzschild geometry which obey the vacuum Einstein equation, preserve the mean curvature and induced conformal metric on a sphere a distance λ from the horizon and are regular on the future horizon. We show perturbatively that in the limit λ → 0 the deformations are given by solutions of the nonlinear incompressible Navier-Stokes equation on the p-sphere. This relation provides a link between global existence for p-dimensional incompressible Navier-Stokes fluids and a novel form of cosmic censorship in p + 2-dimensional general relativity.Physic
The FGK formalism for black p-branes in d dimensions

We present a generalization to an arbitrary number of spacetime (d) and
worldvolume (p+1) dimensions of the formalism proposed by Ferrara, Gibbons and
Kallosh to study black holes (p=0) in d=4 dimensions. We include the special
cases in which there can be dyonic and self- or anti-self-dual black branes.
Most of the results valid for 4-dimensional black holes (relations between
temperature, entropy and non-extremality parameter, and between entropy and
black-hole potential on the horizon) are straightforwardly generalized.
  We apply the formalism to the case of black strings in N=2,d=5 supergravity
coupled to vector multiplets, in which the black-string potential can be
expressed in terms of the dual central charge and work out an explicit example
with one vector multiplet, determining supersymmetric and non-supersymmetric
attractors and constructing the non-extremal black-string solutions that
interpolate between them.Comment: 28 pages no figures; v2: some references adde
A New Class of Four-Dimensional N=1 Supergravity with Non-minimal
  Derivative Couplings

In the N=1 four-dimensional new-minimal supergravity framework, we
supersymmetrise the coupling of the scalar kinetic term to the Einstein tensor.
This coupling, although introduces a non-minimal derivative interaction of
curvature to matter, it does not introduce harmful higher-derivatives. For this
construction, we employ off-shell chiral and real linear multiplets. Physical
scalars are accommodated in the chiral multiplet whereas curvature resides in a
linear one.Comment: 18 pages, version published at JHE
Generalized Whittaker states for instanton counting with fundamental
  hypermultiplets

M-theoretic construction of N=2 gauge theories implies that the instanton
partition function is expressed as the scalar product of coherent states
(Whittaker states) in the Verma module of an appropriate two dimensional
conformal field theory. We present the characterizing conditions for such
states that give the partition function with fundamental hypermultiplets for
SU(3) theory and SU(2) theory with a surface operator. We find the states are
no longer the coherent states in the strict sense but we can characterize them
in terms of a few annihilation operators of lower levels combined with the zero
mode (Cartan part) of the Virasoro algebra L_0 or the sl(2) current algebra
J_0^0.Comment: 46 pages; minor change
Shaping black holes with free fields

Starting from a metric Ansatz permitting a weak version of Birkhoff's theorem
we find static black hole solutions including matter in the form of free scalar
and p-form fields, with and without a cosmological constant \Lambda. Single
p-form matter fields permit multiple possibilities, including dyonic solutions,
self-dual instantons and metrics with Einstein-Kaelher horizons. The inclusion
of multiple p-forms on the other hand, arranged in a homogeneous fashion with
respect to the horizon geometry, permits the construction of higher dimensional
dyonic p-form black holes and four dimensional axionic black holes with flat
horizons, when \Lambda<0. It is found that axionic fields regularize black hole
solutions in the sense, for example, of permitting regular -- rather than
singular -- small mass Reissner-Nordstrom type black holes. Their cosmic string
and Vaidya versions are also obtained.Comment: 38 pages. v2: minor changes, published versio
Resummation scheme for 3d Yang-Mills and the two-loop magnetic mass for
  hot gauge theories

Perturbation theory for non-Abelian gauge theories at finite temperature is
plagued by infrared divergences caused by magnetic soft modes $\sim g^2T$,
which correspond to the fields of a 3d Yang-Mills theory. We revisit a gauge
invariant resummation scheme to solve this problem by self-consistent mass
generation using an auxiliary scalar field, improving over previous attempts in
two respects. First, we generalise earlier SU(2) treatments to SU(N). Second,
we obtain a gauge independent two-loop gap equation, correcting an error in the
literature. The resulting two-loop approximation to the magnetic mass
represents a $\sim 15%$ correction to the leading one-loop value, indicating a
reasonable convergence of the resummation.Comment: 16 pages, 3 figure
Hide and Seek With Natural Supersymmetry at the LHC

Gluinos that result in classic large missing transverse momentum signatures
at the LHC have been excluded by 2011 searches if they are lighter than around
800 GeV. This adds to the tension between experiment and supersymmetric
solutions of the naturalness problem, since the gluino is required to be light
if the electroweak scale is to be natural. Here, we examine natural scenarios
where supersymmetry is present, but was hidden from 2011 searches due to
violation of R-parity and the absence of a large missing transverse momentum
signature. Naturalness suggests that third generation states should dominate
gluino decays and we argue that this leads to a generic signature in the form
of same-sign, flavour-ambivalent leptons, without large missing transverse
momentum. As a result, searches in this channel are able to cover a broad range
of scenarios with some generality and one should seek gluinos that decay in
this way with masses below a TeV. We encourage the LHC experiments to tailor a
search for supersymmetry in this form. We consider a specific case that is good
at hiding: baryon number violation, and estimate that the most constraining
existing search from 2011 data implies a lower bound on the gluino mass of 550
GeV.Comment: 25 pages, 7 figure
Suppression of non-prompt J/ψ, prompt J/ψ, and Y(1S) in PbPb collisions at √s NN = 2.76 TeV

Journal of High Energy Physics 2012.5 (2012): 063 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMYields of prompt and non-prompt J/ψ, as well as Y(1S) mesons, are measured by the CMS experiment via their μ +μ - decays in PbPb and pp collisions at √/s NN = 2.76 TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum pT, as well as collision centrality. For prompt J/ψ with relatively high pT (6.5 < pT < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. In the same kinematic range, a suppression of non-prompt J/ψ, which is sensitive to the in-medium b-quark energy loss, is measured for the first time. Also the low-pT Y(1S) mesons are suppressed in PbPb collision
Four lepton flavor violating signals at the LHC

Some yet unknown dynamics is expected to be at work behind the flavor puzzles
of the Standard Model. Speculations exist that this may manifest itself in
significant strength at the terascale. One consequence may be lepton flavor
violation with total lepton number conserved. Already observed in neutrino
oscillation experiments, such a phenomenon may show up more prominently at TeV
energies, thus signaling a completely new physics. Proposed flavor violating
charged dilepton states have already been studied with reference to the LHC.
Here we study the production and detection at the LHC of flavor violating
charged quadrileptons which are shown to have certain advantages over dileptons
in searching for lepton flavor violation. A classification of all six-fermionic
operators, in the chiral basis and contributing to such processes, is made and
the corresponding cross section for each in 14 TeV pp collisions is computed
under the hypothesis of single operator dominance. We further present the
sensitivity reach of the new physics scale $\Lambda$ in terms of the integrated
luminosity.Comment: 16 pages (single column format), 5 eps figures, some typos corrected
  and references reordere
Casimir scaling and renormalization of Polyakov loops in large-N gauge
  theories

We study Casimir scaling and renormalization properties of Polyakov loops in
different irreducible representations in SU(N) gauge theories; in particular,
we investigate the approach to the large-N limit, by performing lattice
simulations of Yang-Mills theories with an increasing number of colors, from 2
to 6. We consider the twelve lowest irreducible representations for each gauge
group, and find strong numerical evidence for nearly perfect Casimir scaling of
the bare Polyakov loops in the deconfined phase. Then we discuss the
temperature dependence of renormalized loops, which is found to be
qualitatively and quantitatively very similar for the various gauge groups. In
particular, close to the deconfinement transition, the renormalized Polyakov
loop increases with the temperature, and its logarithm reveals a characteristic
dependence on the inverse of the square of the temperature. At higher
temperatures, the renormalized Polyakov loop overshoots one, reaches a maximum,
and then starts decreasing, in agreement with weak-coupling predictions. The
implications of these findings are discussed.Comment: 1+33 pages, 14 figures; v2: expanded discussion in sections 2 and 3,
  added references: version published in JHE
Argyres-Douglas Loci, Singularity Structures and Wall-Crossings in Pure
  N=2 Gauge Theories with Classical Gauge Groups

N=2 Seiberg-Witten theories allow an interesting interplay between the
Argyres-Douglas loci, singularity structures and wall-crossing formulae. In
this paper we investigate this connection by first studying the singularity
structures of hyper-elliptic Seiberg-Witten curves for pure N=2 gauge theories
with SU(r+1) and Sp(2r) gauge groups, and propose new methods to locate the
Argyres-Douglas loci in the moduli space, where multiple mutually non-local BPS
states become massless. In a region of the moduli space, we compute dyon
charges for all 2r+2 and 2r+1 massless dyons for SU(r+1) and Sp(2r) gauge
groups respectively for rank r>1. From here we elucidate the connection to the
wall-crossing phenomena for pure Sp(4) Seiberg-Witten theory near the
Argyres-Douglas loci, despite our emphasis being only at the massless sector of
the BPS spectra. We also present 2r-1 candidates for the maximal
Argyres-Douglas points for pure SO(2r+1) Seiberg-Witten theory.Comment: 81 pages, 41 figures, LaTeX; v2: Minor cosmetic changes and
  correction of a typographical error in acknowledgement. Final version to
  appear in JHE
Supersymmetric Electromagnetic Waves on Giants and Dual-Giants

We set up the BPS equations for a D3-brane moving in AdS_5 \times S^5 which
preserves two supercharges and with all bosonic fields turned on in the
world-volume theory. By solving these, we find generalizations of Mikhailov
giants and wobbling dual-giants that include electromagnetic waves propagating
on their world-volume. For these giants (dual-giants) we show that the BPS
field strength is the real part of the pull-back of a holomorphic 2-form in the
ambient space C^3 (C^{1,2}) onto the world-volume.Comment: 18 page
Complete Bundle Moduli Reduction in Heterotic String Compactifications

A major problem in discussing heterotic string models is the stabilisation of
the many vector bundle moduli via the superpotential generated by world-sheet
instantons. In arXiv:1110.6315 we have discussed the method to make a discrete
twist in a large and much discussed class of vector bundles such that the
generation number gets new contributions (which can be tuned suitably) and at
the same time the space of bundle moduli of the new, twisted bundle is a proper
subspace (where the 'new', non-generic twist class exists) of the original
bundle moduli space; one thus gets a model, closely related to the original
model one started with, but with enhanced flexibility in the generation number
and where on the other hand the number of bundle moduli is {\em somewhat}
reduced. Whereas in the previous paper the emphasis was on examples for the new
flexibility in the generation number we here classify and describe explicitly
the twists and give the precise reduction formula (for the number of moduli)
for SU(5) bundles leading to an SU(5) GUT group in four dimensions. Finally we
give various examples where the bundle moduli space is reduced {\em
completely}: the superpotential for such {\em rigid} bundles becomes a function
of the complex structure moduli alone (besides the exponential Kahler moduli
contribution).Comment: 20 page
Fake supersymmetry versus Hamilton-Jacobi

We explain when the first-order Hamilton-Jacobi equations for black holes
(and domain walls) in (gauged) supergravity, reduce to the usual first-order
equations derived from a fake superpotential. This turns out to be equivalent
to the vanishing of a newly found constant of motion and we illustrate this
with various examples. We show that fake supersymmetry is a necessary condition
for having physically sensible extremal black hole solutions. We furthermore
observe that small black holes become scaling solutions near the horizon. When
combined with fake supersymmetry, this leads to a precise extension of the
attractor mechanism to small black holes: The attractor solution is such that
the scalars move on specific curves, determined by the black hole charges, that
are purely geodesic, although there is a non-zero potential.Comment: 20 pages, v2: Typos corrected, references adde
Holographic Studies of Entanglement Entropy in Superconductors

We present the results of our studies of the entanglement entropy of a
superconducting system described holographically as a fully back-reacted
gravity system, with a stable ground state. We use the holographic prescription
for the entanglement entropy. We uncover the behavior of the entropy across the
superconducting phase transition, showing the reorganization of the degrees of
freedom of the system. We exhibit the behaviour of the entanglement entropy
from the superconducting transition all the way down to the ground state at
T=0. In some cases, we also observe a novel transition in the entanglement
entropy at intermediate temperatures, resulting from the detection of an
additional length scale.Comment: 21 pages, 14 figures. v2:Clarified some remarks concerning stability.
  v3: Updated to the version that appears in JHE
Exploring alternative symmetry breaking mechanisms at the LHC with 7, 8
  and 10 TeV total energy

In view of the annnouncement that in 2012 the LHC will run at 8 TeV, we study
the possibility of detecting signals of alternative mechanisms of ElectroWeak
Symmetry Breaking, described phenomenologically by unitarized models, at
energies lower than 14 TeV. A complete calculation with six fermions in the
final state is performed using the PHANTOM event generator. Our results
indicate that at 8 TeV some of the scenarios with TeV scale resonances are
likely to be identified while models with no resonances or with very heavy ones
will be inaccessible, unless the available luminosity will be much higher than
expected
A Formalism for the Systematic Treatment of Rapidity Logarithms in
  Quantum Field Theory

Many observables in QCD rely upon the resummation of perturbation theory to
retain predictive power. Resummation follows after one factorizes the cross
section into the rele- vant modes. The class of observables which are sensitive
to soft recoil effects are particularly challenging to factorize and resum
since they involve rapidity logarithms. In this paper we will present a
formalism which allows one to factorize and resum the perturbative series for
such observables in a systematic fashion through the notion of a "rapidity
renormalization group". That is, a Collin-Soper like equation is realized as a
renormalization group equation, but has a more universal applicability to
observables beyond the traditional transverse momentum dependent parton
distribution functions (TMDPDFs) and the Sudakov form factor. This formalism
has the feature that it allows one to track the (non-standard) scheme
dependence which is inherent in any scenario where one performs a resummation
of rapidity divergences. We present a pedagogical introduction to the formalism
by applying it to the well-known massive Sudakov form factor. The formalism is
then used to study observables of current interest. A factorization theorem for
the transverse momentum distribution of Higgs production is presented along
with the result for the resummed cross section at NLL. Our formalism allows one
to define gauge invariant TMDPDFs which are independent of both the hard
scattering amplitude and the soft function, i.e. they are uni- versal. We
present details of the factorization and resummation of the jet broadening
cross section including a renormalization in pT space. We furthermore show how
to regulate and renormalize exclusive processes which are plagued by endpoint
singularities in such a way as to allow for a consistent resummation.Comment: Typos in Appendix C corrected, as well as a typo in eq. 5.6
On the BPS Spectrum at the Root of the Higgs Branch

We study the BPS spectrum and walls of marginal stability of the
$\mathcal{N}=2$ supersymmetric theory in four dimensions with gauge group SU(n)
and $n\le N_{f}<2n$ fundamental flavours at the root of the Higgs branch. The
strong-coupling spectrum of this theory was conjectured in hep-th/9902134 to
coincide with that of the two-dimensional supersymmetric
$\mathbb{CP}^{2n-N_{f}-1}$ sigma model. Using the Kontsevich--Soibelman
wall-crossing formula, we start with the conjectured strong-coupling spectrum
and extrapolate it to all other regions of the moduli space. In the
weak-coupling regime, our results precisely agree with the semiclassical
analysis of hep-th/9902134: in addition to the usual dyons, quarks, and $W$
bosons, if the complex masses obey a particular inequality, the resulting
weak-coupling spectrum includes a tower of bound states consisting of a dyon
and one or more quarks. In the special case of $\mathbb{Z}_{n}$-symmetric
masses, there are bound states with one quark for odd $n$ and no bound states
for even $n$.Comment: 11 pages, 4 figure