pinecone/core-2020-05-10-deduplication huggingface dataset:
On higher spin symmetries in de Sitter QFTs

We consider the consequences of global higher-spin symmetries in quantum
field theories on a fixed de Sitter background of spacetime dimension $D \ge
3$. These symmetries enhance the symmetry group associated with the isometries
of the de Sitter background and thus strongly constrain the dynamics of the
theory. In particular, we consider the case when a higher spin charge acts
linearly on a scalar operator to leading order in a Fefferman-Graham expansion
near the future/past conformal boundaries. We show that this implies that the
expectation values of the operator inserted near the boundaries are
asymptotically Gaussian. Thus, these operators have trivial cosmological
spectra, and on global de Sitter these operators have only Gaussian
correlations between operators inserted near future/past infinity. The latter
result may be interpreted as an analogue of the Coleman-Mandula theorem for
QFTs on de Sitter spacetime.Comment: 20 pp; accepted to JHEP; latest version: expanded introduction,
  additional reference
The Q-cut Representation of One-loop Integrands and Unitarity Cut Method

Recently, a new construction for complete loop integrands of massless field
theories has been proposed, with on-shell tree-level amplitudes delicately
incorporated into its algorithm. This new approach reinterprets integrands in a
novel form, namely the Q-cut representation. In this paper, by deriving
one-loop integrands as examples, we elaborate in details the technique of this
new representation, e.g., the summation over all possible Q-cuts as well as
helicity states for the non-scalar internal particle in the loop. Moreover, we
show that the integrand in the Q-cut representation naturally reduces to the
integrand in the traditional unitarity cut method for each given cut channel,
providing a cross-check for the new approach.Comment: 33 pages, 5 figures, 3 appendice
Supersymmetric R\'enyi Entropy in Two Dimensions

We compute the exact partition function on the branched two-sphere by the
localization technique. It is found that it does not depend on a branching
parameter q, which means that supersymmetric R\'enyi entropy defined by
utilizing it is equivalent to the usual entanglement entropy. We also provide
the interpretation of the conical singularities on the branched sphere as
defects sit on the poles of the nonsingular two-sphere.Comment: 27 pages; v2: typos and discussions revised, and reference added; v3:
  typos corrected and published in JHE
Signatures of top flavour-changing dark matter

We develop the phenomenology of scenarios in which a dark matter candidate
interacts with a top quark through flavour-changing couplings, employing a
simplified dark matter model with an s-channel vector-like mediator. We study
in detail the top-charm flavour-changing interaction, by investigating the
single top plus large missing energy signature at the LHC as well as
constraints from the relic density and direct and indirect dark matter
detection experiments. We present strategies to distinguish between the
top-charm and top-up flavour-changing models by taking advantage of the lepton
charge asymmetry as well as by using charm-tagging techniques on an extra jet.
We also show the complementarity between the LHC and canonical dark matter
experiments in exploring the viable parameter space of the models.Comment: 40 pages, 9 figures, 6 table
Remarks on scale separation in flux vacua

We argue that the Maldacena-Nunez no-go theorem excluding Minkowski and de
Sitter vacua in flux compactifications can be extended to exclude anti-de
Sitter (AdS) vacua for which the Kaluza-Klein scale is parametrically smaller
than the AdS length scale. As a practical application of this observation we
demonstrate that the mechanism to resolve O6 singularities in massive type IIA
at the classical level is likely not to occur in AdS compactifications with
scale separation. We furthermore remark that a compactification to four
observable dimensions implies a large cosmological hierarchy.Comment: 12 pages, 1 figur
Explaining AMS-02 positron excess and muon anomalous magnetic moment in
  dark left-right gauge model

In a Dark left-right gauge model, the neutral component of right-handed
lepton doublet is odd under generalized R-parity and thus the lightest one
serves as the dark matter (DM) candidate. The coannihilation of the dark matter
with the singly charged Higgs triplet produces the correct relic abundance. We
explain AMS-02 positron excess by the annihilation of 800 GeV dark matter into
$\mu^+\mu^-\gamma$, through a t-channel exchange of the additional charged
triplet Higgs boson. The DM is leptophilic which is useful for explaining the
non-observation of any antiproton excess which would generically be expected
from DM annihilation. The large cross-section needed to explain AMS-02 also
requires an astrophysical boost. In addition, we show that the muon $(g-2)$
receives required contribution from singly and doubly charged triplet Higgs in
the loops.Comment: 16 pages, 7 figures, Replaced with journal version. To appear in JHE
Large N behavior of mass deformed ABJM theory

In this paper, using the localization technique we analyze the large N limit
of the mass deformed Aharony-Bergman-Jafferis-Maldacena (ABJM) theory on the
three sphere with a finite mass parameter and finite Chern-Simons levels. We
find two different solutions of the saddle point equations in the large N
limit. With these solutions we compute the free energy and find that there is a
first order phase transition. Our results may predict a phase transition in the
dual gravity theory.Comment: 25 pages,3 figures; v2: typos corrected, a comment on solution II
  added, footnotes added, references adde
Universal Properties of Type IIB and F-theory Flux Compactifications at
  Large Complex Structure

We consider flux compactifications of type IIB string theory and F-theory in
which the respective superpotentials at large complex structure are dominated
by cubic or quartic terms in the complex structure moduli. In this limit, the
low-energy effective theory for the complex structure and axio-dilaton sector
exhibits universal properties that are insensitive to the details of the
compactification manifold or the flux configuration. We show that there are no
vacua in this region and the spectrum of the Hessian matrix is highly peaked
and consists only of three distinct eigenvalues ($0$, $2m_{3/2}^2$ and
$8m_{3/2}^2$), independently of the number of moduli. We briefly comment on how
the inclusion of K\"ahler moduli affect these findings. Our results generalise
those of Brodie & Marsh [1], in which these universal properties were found in
a subspace of the large complex structure limit of type IIB compactifications.Comment: 19 pages, published versio
Soft gluon resummation for associated $t \bar{t} H$ production at the
  LHC

We perform resummation of soft gluon corrections to the total cross section
for the process $pp \to t\bar{t}H$. The resummation is carried out at
next-to-leading-logarithmic (NLL) accuracy using the Mellin space technique,
extending its application to the class of $2 \to 3$ processes. We present an
analytical result for the soft anomalous dimension for a hadronic production of
two coloured massive particles in association with a colour singlet. We discuss
the impact of resummation on the numerical prediction for the associated Higgs
boson production with top quarks at the LHC.Comment: 11 pages, 4 figure
Semilocal Fractional Instantons

We find semi-local fractional instantons of codimension four in Abelian and
non-Abelian gauge theories coupled with scalar fields and the corresponding
${\mathbb C}P^{N-1}$ and Grassmann sigma models at strong gauge coupling. They
are 1/4 BPS states in supersymmetric theories with eight supercharges, carry
fractional (half) instanton charges characterized by the fourth homotopy group
$\pi_4 (G/H)$, and have divergent energy in infinite spaces. We construct exact
solutions for the sigma models and numerical solutions for the gauge theories.
Small instanton singularity in sigma models is resolved at finite gauge
coupling (for the Abelian gauge theory). Instantons in Abelian and non-Abelian
gauge theories have negative and positive instantons charges, respectively,
which are related by the Seiberg-like duality that changes the sign of the
instanton charge.Comment: 20 pages, 10 figures, published version with minor change
S-Duality and Helicity Amplitudes

We examine interacting Abelian theories at low energies and show that
holomorphically normalized photon helicity amplitudes transform into dual
amplitudes under SL(2,Z) as modular forms with weights that depend on the
number of positive and negative helicity photons and on the number of internal
photon lines. Moreover, canonically normalized helicity amplitudes transform by
a phase, so that even though the amplitudes are not duality invariant, their
squares are duality invariant. We explicitly verify the duality transformation
at one loop by comparing the amplitudes in the case of an electron and the dyon
that is its SL(2,Z) image, and extend the invariance of squared amplitudes
order by order in perturbation theory. We demonstrate that S-duality is
property of all low-energy effective Abelian theories with electric and/or
magnetic charges and see how the duality generically breaks down at high
energies.Comment: 27 pages, 3 figure
Landau Singularities and Symbology: One- and Two-loop MHV Amplitudes in
  SYM Theory

We apply the Landau equations, whose solutions parameterize the locus of
possible branch points, to the one- and two-loop Feynman integrals relevant to
MHV amplitudes in planar $\mathcal{N}=4$ super-Yang-Mills theory. We then
identify which of the Landau singularities appear in the symbols of the
amplitudes, and which do not. We observe that all of the symbol entries in the
two-loop MHV amplitudes are already present as Landau singularities of one-loop
pentagon integrals.Comment: 18 pages, 3 figures; v2: minor typos correcte
Localization of twisted $\mathcal{N}{=}(0,2)$ gauged linear sigma models
  in two dimensions

We study two-dimensional $\mathcal{N}{=}(0,2)$ supersymmetric gauged linear
sigma models (GLSMs) using supersymmetric localization. We consider
$\mathcal{N}{=}(0,2)$ theories with an $R$-symmetry, which can always be
defined on curved space by a pseudo-topological twist while preserving one of
the two supercharges of flat space. For GLSMs which are deformations of
$\mathcal{N}{=}(2,2)$ GLSMs and retain a Coulomb branch, we consider the
$A/2$-twist and compute the genus-zero correlation functions of certain
pseudo-chiral operators, which generalize the simplest twisted chiral ring
operators away from the $\mathcal{N}{=}(2,2)$ locus. These correlation
functions can be written in terms of a certain residue operation on the Coulomb
branch, generalizing the Jeffrey-Kirwan residue prescription relevant for the
$\mathcal{N}{=}(2,2)$ locus. For abelian GLSMs, we reproduce existing results
with new formulas that render the quantum sheaf cohomology relations and other
properties manifest. For non-abelian GLSMs, our methods lead to new results. As
an example, we briefly discuss the quantum sheaf cohomology of the Grassmannian
manifold.Comment: 39 pages plus appendices. v2: added references and corrected typo
AdS$_4$ solutions of massive IIA from dyonic ISO(7) supergravity

Explicit formulae are given for the consistent truncation of massive type IIA
supergravity on the six-sphere to the SU(3)--invariant sector of $D=4$ ${\cal
N}=8$ supergravity with dyonic ISO(7) gauging. These formulae are then used to
construct AdS$_4$ solutions of massive type IIA via uplift on $S^6$ of the
critical points of the $D=4$ supergravity with at least SU(3) symmetry. We find
a new ${\cal N}=1$ solution with SU(3) symmetry, a new non-supersymmetric
solution with SO(6) symmetry, and recover previously known solutions. We
quantise the fluxes, calculate the gravitational free energies of the solutions
and discuss the stability of the non-supersymmetric ones. Among these, a
(previously known) G$_2$--invariant solution is found to be stable.Comment: 30 pages; v2: a few typos corrected and reference added; v3: A few
  clarifications and reference added. Version published in JHEP03(2016)07
The deconfining phase transition of SO(N) gauge theories in 2+1
  dimensions

We calculate the deconfining temperature of SO(N) gauge theories in 2+1
dimensions, and determine the order of the phase transition as a function of N,
for various values of N in the range [4,16]. We do so by extrapolating our
lattice results to the infinite volume limit, and then to the continuum limit,
for each value of N. We then extrapolate to the N=infinity limit and observe
that the SO(N) and SU(N) deconfining temperatures agree in that limit. We find
that the the deconfining temperatures of all the SO(N) gauge theories appear to
follow a single smooth function of N, despite the lack of a non-trivial centre
for odd N. We also compare the deconfining temperatures of SO(6) with SU(4),
and of SO(4) with SU(2)xSU(2), motivated by the fact that these pairs of gauge
theories share the same Lie algebras.Comment: 52 pages, 20 figures. Some introductory material removed. Improved
  discussion of odd N, the centre and confinemen
Two Higgs doublets to explain the excesses $pp\rightarrow
  \gamma\gamma(750\ {\rm GeV})$ and $h \to \tau^\pm \mu^\mp$

The two Higgs doublet model emerges as a minimal scenario in which to
address, at the same time, the $\gamma\gamma$ excess at 750 GeV and the lepton
flavour violating decay into $\tau^\pm \mu^\mp $ of the 125 GeV Higgs boson.
The price to pay is additional matter to enhance the $\gamma\gamma$ rate, and a
peculiar pattern for the lepton Yukawa couplings. We add TeV scale vector-like
fermions and find parameter space consistent with both excesses, as well as
with Higgs and electroweak precision observables.Comment: 15 pages, 1 figure; v2: discussion of tau-->mu gamma added, leading
  to an additional constraint. v3: references added, figure 1 recovered and
  figure 2 adde
Exotic Quarks in Twin Higgs Models

The Twin Higgs model provides a natural theory for the electroweak symmetry
breaking without the need of new particles carrying the standard model gauge
charges below a few TeV. In the low energy theory, the only probe comes from
the mixing of the Higgs fields in the standard model and twin sectors. However,
an ultraviolet completion is required below ~ 10 TeV to remove residual
logarithmic divergences. In non-supersymmetric completions, new exotic fermions
charged under both the standard model and twin gauge symmetries have to be
present to accompany the top quark, thus providing a high energy probe of the
model. Some of them carry standard model color, and may therefore be copiously
produced at current or future hadron colliders. Once produced, these exotic
quarks can decay into a top together with twin sector particles. If the twin
sector particles escape the detection, we have the irreducible stop-like
signals. On the other hand, some twin sector particles may decay back into the
standard model particles with long lifetimes, giving spectacular displaced
vertex signals in combination with the prompt top quarks. This happens in the
Fraternal Twin Higgs scenario with typical parameters, and sometimes is even
necessary for cosmological reasons. We study the potential displaced vertex
signals from the decays of the twin bottomonia, twin glueballs, and twin
leptons in the Fraternal Twin Higgs scenario. Depending on the details of the
twin sector, the exotic quarks may be probed up to ~ 2.5 TeV at the LHC and
beyond 10 TeV at a future 100 TeV collider, providing a strong test of this
class of ultraviolet completions.Comment: 43 pages, 5 figures, 3 table
Anomalies and Entanglement Entropy

We initiate a systematic study of entanglement and Renyi entropies in the
presence of gauge and gravitational anomalies in even-dimensional quantum field
theories. We argue that the mixed and gravitational anomalies are sensitive to
boosts and obtain a closed form expression for their behavior under such
transformations. Explicit constructions exhibiting the dependence of
entanglement entropy on boosts is provided for theories on spacetimes with
non-trivial magnetic fluxes and (or) non-vanishing Pontryagin classes.Comment: 17 pages + appendice
Notes on Super Killing Tensors

The notion of a Killing tensor is generalised to a superspace setting.
Conserved quantities associated with these are defined for superparticles and
Poisson brackets are used to define a supersymmetric version of the
Schouten-Nijenhuis bracket. Superconformal Killing tensors in flat superspaces
are studied for spacetime dimensions 3,4,5,6 and 10. These tensors are also
presented in analytic superspaces and super-twistor spaces for 3,4 and 6
dimensions. Algebraic structures associated with superconformal Killing tensors
are also briefly discussedComment: 34 pages, 2 figures. Clarifying comments to make the article more
  accessible to mathematicians added. Some new references include
Testing R-parity with Geometry

We present a complete classification of the vacuum geometries of all
renormalizable superpotentials built from the fields of the electroweak sector
of the MSSM. In addition to the Severi and affine Calabi-Yau varieties
previously found, new vacuum manifolds are identified; we thereby investigate
the geometrical implication of theories which display a manifest matter parity
(or R-parity) via the distinction between leptonic and Higgs doublets, and of
the lepton number assignment of the right-handed neutrino fields. We find that
the traditional R-parity assignments of the MSSM more readily accommodate the
neutrino see-saw mechanism with non-trivial geometry than those superpotentials
that violate R-parity. However there appears to be no geometrical preference
for a fundamental Higgs bilinear in the superpotential, with operators that
violate lepton number, such as \nu H\bar{H}, generating vacuum moduli spaces
equivalent to those with a fundamental bilinear.Comment: 29 pages, LaTe
Measurement of D$_s^+$ production and nuclear modification factor in
  Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV

The production of prompt D$_s^+$ mesons was measured for the first time in
collisions of heavy nuclei with the ALICE detector at the LHC. The analysis was
performed on a data sample of Pb-Pb collisions at a centre-of-mass energy per
nucleon pair, $\sqrt{s_{\rm NN}}$, of 2.76 TeV in two different centrality
classes, namely 0-10% and 20-50%. D$_s^+$ mesons and their antiparticles were
reconstructed at mid-rapidity from their hadronic decay channel
D$_s^+\rightarrow\phi\pi^+$, with $\phi\rightarrow$K$^-$K$^+$, in the
transverse momentum intervals $4< p_{\rm T}<12$ GeV/$c$ and $6< p_{\rm T}<12$
GeV/$c$ for the 0-10% and 20-50% centrality classes, respectively. The nuclear
modification factor $R_{\rm AA}$ was computed by comparing the $p_{\rm
T}$-differential production yields in Pb-Pb collisions to those in
proton-proton (pp) collisions at the same energy. This pp reference was
obtained using the cross section measured at $\sqrt{s}= 7$ TeV and scaled to
$\sqrt{s}= 2.76$ TeV. The $R_{\rm AA}$ of D$_s^+$ mesons was compared to that
of non-strange D mesons in the 10% most central Pb-Pb collisions. At high
$p_{\rm T}$ ($8< p_{\rm T}<12$ GeV/$c$) a suppression of the D$_s^+$-meson
yield by a factor of about three, compatible within uncertainties with that of
non-strange D mesons, is observed. At lower $p_{\rm T}$ ($4< p_{\rm T}<8$
GeV/$c$) the values of the D$_s^+$-meson $R_{\rm AA}$ are larger than those of
non-strange D mesons, although compatible within uncertainties. The production
ratios D$_s^+$/D$^0$ and D$_s^+$\D$^+$ were also measured in Pb-Pb collisions
and compared to their values in proton-proton collisions.Comment: 27 pages, 6 captioned figures, 4 tables, authors from page 22,
  published version, figures at
  http://aliceinfo.cern.ch/ArtSubmission/node/188
N=3 four dimensional field theories

We introduce a class of four dimensional field theories constructed by
quotienting ordinary $\mathcal{N}=4$ $U(N)$ SYM by particular combinations of
R-symmetry and $SL(2,\mathbb{Z})$ automorphisms. These theories appear
naturally on the worldvolume of D3 branes probing terminal singularities in
F-theory, where they can be thought of as non-perturbative generalizations of
the O3 plane. We focus on cases preserving only 12 supercharges, where the
quotient gives rise to theories with coupling fixed at a value of order one.
These constructions possess an unconventional large $N$ limit described by a
non-trivial F-theory fibration with base $AdS_5\times (S^5/\mathbb{Z}_k)$. Upon
reduction on a circle the $\mathcal{N}=3$ theories flow to well-known
$\mathcal{N}=6$ ABJM theories.Comment: 22 pages, 2 figures. v2: fixed orientifold charges, added references,
  v3: added reference
One-Loop Soft Theorems via Dual Superconformal Symmetry

We study soft theorems at one loop in planar N=4 super Yang-Mills theory
through finite order in the infrared regulator and to subleading order in the
soft parameter {\delta}. In particular, we derive a universal constraint from
dual superconformal symmetry, which we use to bootstrap subleading log {\delta}
behaviour. Moreover, we determine the complete infrared-finite subleading soft
contribution of n-point MHV amplitudes using momentum twistors. Finally, we
compute the subleading log {\delta} behaviour of one-loop NMHV ratio functions
at six and seven points, finding that universality holds within but not between
helicity sectors.Comment: 40 pages, 5 figure
Black hole thermodynamics from a variational principle: Asymptotically
  conical backgrounds

The variational problem of gravity theories is directly related to black hole
thermodynamics. For asymptotically locally AdS backgrounds it is known that
holographic renormalization results in a variational principle in terms of
equivalence classes of boundary data under the local asymptotic symmetries of
the theory, which automatically leads to finite conserved charges satisfying
the first law of thermodynamics. We show that this connection holds well beyond
asymptotically AdS black holes. In particular, we formulate the variational
problem for $\mathcal{N}=2$ STU supergravity in four dimensions with boundary
conditions corresponding to those obeyed by the so called `subtracted
geometries'. We show that such boundary conditions can be imposed covariantly
in terms of a set of asymptotic second class constraints, and we derive the
appropriate boundary terms that render the variational problem well posed in
two different duality frames of the STU model. This allows us to define finite
conserved charges associated with any asymptotic Killing vector and to
demonstrate that these charges satisfy the Smarr formula and the first law of
thermodynamics. Moreover, by uplifting the theory to five dimensions and then
reducing on a 2-sphere, we provide a precise map between the thermodynamic
observables of the subtracted geometries and those of the BTZ black hole.
Surface terms play a crucial role in this identification.Comment: 35 pages; v2: one reference added, minor typos corrected, version
  accepted in JHE
Supersymmetric Yang-Mills theory on conformal supergravity backgrounds
  in ten dimensions

We consider bosonic supersymmetric backgrounds of ten-dimensional conformal
supergravity. Up to local conformal isometry, we classify the maximally
supersymmetric backgrounds, determine their conformal symmetry superalgebras
and show how they arise as near-horizon geometries of certain half-BPS
backgrounds or as a plane-wave limit thereof. We then show how to define
Yang-Mills theory with rigid supersymmetry on any supersymmetric conformal
supergravity background and, in particular, on the maximally supersymmetric
backgrounds. We conclude by commenting on a striking resemblance between the
supersymmetric backgrounds of ten-dimensional conformal supergravity and those
of eleven-dimensional Poincar\'e supergravity.Comment: 30 page