pinecone/core-2020-05-10-deduplication huggingface dataset:
On sgoldstino-less supergravity models of inflation

We go a step further in the search for a consistent and realistic supergravity model of large-field inflation by building a class of models with the following features: during slow-roll, all the scalar fields other than the inflaton are frozen by large inflatondependent masses or removed from the spectrum; at the end of inflation, supersymmetry is spontaneously broken with naturally vanishing classical vacuum energy. We achieve this by combining some geometrical properties of the Kähler potential with the consistent use of a single nilpotent chiral superfield, in one-to-one correspondence with the supersymmetrybreaking direction in field space at the vacuum
The N > 2 supersymmetric AdS vacua in maximal supergravity

We perform a systematic search for anti-de Sitter vacua of maximal supergravity with N>2 residual supersymmetries. We find that maximal supergravity admits two 1-parameter classes of N=3 and N=4 vacua, respectively. They are embedded, for the different values of an angular parameter, in the ω-rotated SO(8) (N=3) and SO(1, 7) ( N=4 and 3) gauged models. All vacua disappear in the ω → 0 limit. We determine the mass spectra and the AdS-supermultiplet structure. These appear to be the first and only N>2 supersymmetric AdS vacua in maximal supergravity, aside from the N=8 vacua of the SO(8)-gauged models. We also prove on general grounds that no such vacua can exist for 4<N<
Drag force in strongly coupled, anisotropic plasma at finite chemical potential

We employ methods of gauge/string duality to analyze the drag force on a heavy quark moving through a strongly coupled, anisotropic N $$ \mathcal{N} $$ = 4, SU( N ) super YangMills plasma in the presence of a finite U(1) chemical potential. We present numerical results valid for any value of the anisotropy parameter and the U(1) charge density and arbitrary direction of the quark velocity with respect to the direction of anisotropy. In the small anisotropy limit we are also able to furnish analytical results
Asymptotic safety guaranteed

We study the ultraviolet behaviour of four-dimensional quantum field theories
involving non-abelian gauge fields, fermions and scalars in the Veneziano
limit. In a regime where asymptotic freedom is lost, we explain how the three
types of fields cooperate to develop fully interacting ultraviolet fixed
points, strictly controlled by perturbation theory. Extensions towards strong
coupling and beyond the large-N limit are discussed.Comment: 31 pages, 7 figures, explanations and references added, typos
  corrected; to appear (JHEP
On the particle spectrum and the conformal window

We study the SU(3) gauge theory with twelve flavours of fermions in the fundamental representation as a prototype of non-Abelian gauge theories inside the conformal window. Guided by the pattern of underlying symmetries, chiral and conformal, we analyze the two-point functions theoretically and on the lattice, and determine the finite size scaling and the infinite volume fermion mass dependence of the would-be hadron masses. We show that the spectrum in the Coulomb phase of the system can be described in the context of a universal scaling analysis and we provide the nonperturbative determination of the fermion mass anomalous dimension γ ∗ = 0.235(46) at the infrared fixed point. We comment on the agreement with the four-loop perturbative prediction for this quantity and we provide a unified description of all existing lattice results for the spectrum of this system, them being in the Coulomb phase or the asymptotically free phase. Our results corroborate the view that the fixed point we are studying is not associated to a physical singularity along the bare coupling line and estimates of physical observables can be attempted on either side of the fixed point. Finally, we observe the restoration of the U(1) axial symmetry in the two-point functions
Semiclassical S-matrix for black holes

We propose a semiclassical method to calculate S-matrix elements for
two-stage gravitational transitions involving matter collapse into a black hole
and evaporation of the latter. The method consistently incorporates
back-reaction of the collapsing and emitted quanta on the metric. We illustrate
the method in several toy models describing spherical self-gravitating shells
in asymptotically flat and AdS space-times. We find that electrically neutral
shells reflect via the above collapse-evaporation process with probability
exp(-B), where B is the Bekenstein-Hawking entropy of the intermediate black
hole. This is consistent with interpretation of exp(B) as the number of black
hole states. The same expression for the probability is obtained in the case of
charged shells if one takes into account instability of the Cauchy horizon of
the intermediate Reissner-Nordstrom black hole. Our semiclassical method opens
a new systematic approach to the gravitational S-matrix in the non-perturbative
regime.Comment: 41 pages, 13 figures; Introduction rewritten, references added;
  journal versio
Brown-York quasilocal energy in Lanczos-Lovelock gravity and black hole
  horizons

A standard candidate for quasilocal energy in general relativity is the
Brown-York energy, which is essentially a two dimensional surface integral of
the extrinsic curvature on the two-boundary of a spacelike hypersurface
referenced to flat spacetime. Several years back one of us had conjectured that
the black hole horizon is defined by equipartition of gravitational and
non-gravitational energy. By employing the above definition of quasilocal
Brown-York energy, we have verified the equipartition conjecture for static
charged and charged axi-symmetric blck holes in general relativity. We have
further generalized the Brown-York formalism to all orders in Lanczos-Lovelock
theories of gravity and have verified the conjecture for pure Lovelock charged
black hole in all even d=2m+2 dimensions, where m is the degree of Lovelock
action. It turns out that the equipartition conjecture works only for pure
Lovelock, and not for Einstein-Lovelock, black holes.Comment: v2, References added, 18 pages, No figure
Classes of Stable Initial Data for Massless and Massive Scalars in
  Anti-de Sitter Spacetime

Since horizon formation in global anti-de Sitter spacetime is dual to
thermalization of a conformal field theory on a compact space, whether generic
initial data is stable or unstable against gravitational collapse is of great
interest. We argue that all the known stable initial data for massless scalars
are dominated by single scalar eigenmodes, specifically providing strong
numerical evidence consistent with the interpretation that initial data with
equal energies in two modes collapse on time scales of order the inverse square
of the amplitude. We further scan the parameter space for massive scalar field
initial data and present evidence for a novel class of stable or quasi-stable
solutions for massive scalars with energy spread through several eigenmodes.Comment: 31 pages v2. minor clarifications and updates to numerical results 31
  pages v3. minor changes to match version published in JHE
Natural Scherk-Schwarz Theories of the Weak Scale

Natural supersymmetric theories of the weak scale are under growing pressure
given present LHC constraints, raising the question of whether untuned
supersymmetric (SUSY) solutions to the hierarchy problem are possible. In this
paper, we explore a class of 5-dimensional natural SUSY theories in which SUSY
is broken by the Scherk-Schwarz mechanism. We pedagogically explain how
Scherk-Schwarz elegantly solves the traditional problems of 4-dimensional SUSY
theories (based on the MSSM and its many variants) that usually result in an
unsettling level of fine-tuning. The minimal Scherk-Schwarz set up possesses
novel phenomenology, which we briefly outline. We show that achieving the
observed physical Higgs mass motivates extra structure that does not
significantly affect the level of tuning (always better than $\sim 10\%$) and
we explore three qualitatively different extensions: the addition of extra
matter that couples to the Higgs, an extra $U(1)^\prime$ gauge group under
which the Higgs is charged and an NMSSM-like solution to the Higgs mass
problem.Comment: 36 pages + appendix, 12 figure
Thermodynamics of QCD from Sakai-Sugimoto Model

Till date, the only consistent description of the deconfinement phase of the
Sakai-Sugimoto model appears to be provided by the analysis of [1]
(arXiv:1107.4048). The current version of the analysis, however, has a subtlety
regarding the monodromy of quarks around the Euclidean time circle. In this
note, we revisit and resolve this issue by considering the effect of an
imaginary baryon chemical potential on quark monodromies. With this ingredient,
the proposal of [1] for investigating finite temperature QCD using holography
is firmly established. Additionally, our technique allows a holographic
computation of the free energy as a function of the imaginary chemical
potential in the deconfinement phase; we show that our result agrees with the
corresponding formula obtained from perturbative QCD, namely the Roberge-Weiss
potential.Comment: 18 pages, 2 figure
Radiative corrections to the Triple Higgs Coupling in the Inert Higgs
  Doublet Model

We investigate the implication of the recent discovery of a Higgs-like
particle in the first phase of the LHC Run 1 on the Inert Higgs Doublet Model
(IHDM). The determination of the Higgs couplings to SM particles and its
intrinsic properties will get improved during the new LHC Run 2 starting this
year. The new LHC Run 2 would also shade some light on the triple Higgs
coupling. Such measurement is very important in order to establish the details
of the electroweak symmetry breaking mechanism. Given the importance of the
Higgs couplings both at the LHC and $e^+e^-$
  Linear Collider machines, accurate theoretical predictions are required. We
study the radiative corrections to the triple Higgs coupling $hhh$ and to
$hZZ$, $hWW$ couplings in the context of the IHDM. By combining several
theoretical and experimental constraints on parameter space, we show that extra
particles might modify the triple Higgs coupling near threshold regions.
Finally, we discuss the effect of these corrections on the double Higgs
production signal at the $e^+e^-$ LC and show that they can be rather
important.Comment: 25 pages, 10 figure
Upper Bounds on epsilon'/epsilon Parameters B_6^{(1/2)} and B_8^{(3/2)}
  from Large N QCD and other News

We demonstrate that in the large N approach developed by the authors in
collaboration with Bardeen, the parameters B_6^{(1/2)} and B_8^{(3/2)}
parametrizing the K\to\pi\pi matrix elements <Q_6>_0 and <Q_8>_2 of the
dominant QCD and electroweak operators receive both negative O(1/N) corrections
such that B_6^{(1/2)} < B_8^{(3/2)}<1 in agreement with the recent lattice
results of the RBC-UKQCD collaboration. We also point out that the pattern of
the size of the hadronic matrix elements of all QCD and electroweak penguin
operators Q_i contributing to the K\to \pi \pi amplitudes A_0 and A_2, obtained
by this lattice collaboration, provides further support to our large N
approach. In particular, a very precise lattice result for the matrix element
<Q_8>_0 implies for the corresponding parameter B_8^{(1/2)}=1.0\pm 0.2 to be
compared with large N value B_8^{(1/2)}=1.1\pm 0.1. We discuss briefly the
implications of these findings for the ratio epsilon'/epsilon. In fact, with
the precise value for B_8^{(3/2)} from RBC-UKQCD collaboration, our upper bound
on B_6^{(1/2)} implies epsilon'/epsilon in the SM roughly by a factor of two
below its experimental value (16.6\pm 2.3)\times 10^{-4}. We also briefly
comment on the parameter \hat B_K and the \Delta I=1/2$ rule.Comment: 19 pages, Additional section on results from other large N approaches
  added. References added. Conclusions unchanged. Matches the version to appear
  in JHE
Deep inelastic scattering cross sections from the gauge/string duality

Differential cross sections of deep inelastic scattering of charged leptons
from hadrons are investigated by using the gauge/string duality. We consider
vector mesons derived from different holographic dual models obtaining a
general expression. We focus on the strongly coupled regime of dual gauge
theories for different values of the Bjorken parameter. We find new predictions
which are particularly interesting for differential scattering cross sections
of polarized leptons scattered off polarized vector mesons. We also carry out a
detailed comparison of the moments of the structure functions with lattice QCD
results.Comment: 42 pages, 5 tables, 9 figure
Some tree-level string amplitudes in the NSR formalism

We calculate tree level scattering amplitudes for open strings using the NSR
formalism. We present a streamlined symmetry-based and pedagogical approach to
the computations, which we first develop by checking two-, three-, and
four-point functions involving bosons and fermions. We calculate the five-point
amplitude for massless gluons and find agreement with an earlier result by
Brandt, Machado and Medina. We then compute the five-point amplitudes involving
two and four fermions respectively, the general form of which has not been
previously obtained in the NSR formalism. The results nicely confirm
expectations from the supersymmetric $F^4$ effective action. Finally we use the
prescription of Kawai, Lewellen and Tye (KLT) to compute the amplitudes for the
closed string sector.Comment: 40+8 pages; v2: references added; v3: additional field theory checks
  made; published version; v4: minor corrections; results unchange
Glueballs as rotating folded closed strings

In previous papers we argued that mesons and baryons can be described as
rotating open strings in holographic backgrounds. Now we turn to closed
strings, which should be the duals of glueballs. We look at the rotating folded
closed string in both flat and curved backgrounds.
  A basic prediction of the closed string model is that the slope of Regge
trajectories is half that of open strings. We propose that a simple method to
identify glueballs is to look for resonances that belong to trajectories with a
slope of approximately 0.45 GeV^-2, half the meson slope. We therefore look at
the experimental spectra of flavorless light mesons to see if such a scheme,
where some of the states are placed on open string trajectories and some on
closed ones, can fit known experimental data. We look at the f_0 (J^PC = 0^++)
and f_2 (2^++) resonances. As there is no preference for a single scheme of
sorting the different states into meson and glueball trajectories, we present
several possibilities, each identifying a different state as the glueball. We
supplement each scheme with predictions for the masses of excited glueballs.
  We show that the width of the decay into two mesons is different for
glueballs and mesons thus providing a supplementary tool to distinguish between
them. In addition, we look at some lattice QCD results for glueball spectra and
check their compatibility with the closed string model.
  One of the main conclusions of this paper is that an extension of
experimental data on the spectrum of flavorless hadrons is needed, in
particular in the region between around 2.4 GeV and 3 GeV.Comment: v1: 43 pages, v2: references added, 44 pages, v3: references added,
  44 page
The ${\cal N}=4$ Schur index with Polyakov loops

Recently the Schur index of ${\cal N}=4$ SYM was evaluated in closed form to
all orders including exponential corrections in the large $N$ expansion and for
fixed finite $N$. This was achieved by identifying the matrix model which
calculates the index with the partition function of a system of free fermions
on a circle. The index can be enriched by the inclusion of loop operators and
the case of Wilson loops is particularly easy, as it amounts to inserting extra
characters into the matrix model. The Fermi-gas approach is applied here to
this problem, the formalism is explored and explicit results at large $N$ are
found for the fundamental as well as a few other symmetric and antisymmetric
representations.Comment: 15 pages. 1 figur
Gravitating BPS Skyrmions

The BPS Skyrme model has many exact analytic solutions in flat space. We
generalize the model to a curved space or spacetime and find that the solutions
can only be BPS for a constant time-time component of the metric tensor. We
find exact solutions on the curved spaces: a 3-sphere and a 3-hyperboloid; and
we further find an analytic gravitating Skyrmion on the 3-sphere. For the case
of a nontrivial time-time component of the metric, we suggest a potential for
which we find analytic solutions on anti-de Sitter and de Sitter spacetimes in
the limit of no gravitational backreaction. We take the gravitational coupling
into account in numerical solutions and show that they are well approximated by
the analytic solutions for weak gravitational coupling.Comment: LaTeX: 27 pages, 6 figures; V2: typos correcte
A 125 GeV Fat Higgs at large $\tan \beta$

We study the viability of regions of large $\tan \beta$ within the framework
of Fat Higgs/$\lambda$-SUSY Models. We compute the one-loop effective potential
to find the corrections to the Higgs boson mass due to the heavy non-standard
Higgs bosons. As the tree level contribution to the Higgs boson mass is
suppressed at large $\tan \beta$, these one-loop corrections are crucial to
raising the Higgs boson mass to the measured LHC value. By raising the Higgsino
and singlino mass parameters, typical electroweak precision constraints can
also be avoided. We illustrate these new regions of Fat Higgs/$\lambda$-SUSY
parameter space by finding regions of large $\tan \beta$ that are consistent
with all experimental constraints including direct dark matter detection
experiments, relic density limits and the invisible decay width of the $Z$
boson. We find that there exist regions around $\lambda = 1.25, \tan \beta =
50$ and a uniform psuedo-scalar $4~{\rm TeV} \lsim M_A \lsim 8$~TeV which are
consistent will all present phenomenological constraints. In this region the
dark matter relic abundance and direct detection limits are satisfied by a
lightest neutralino that is mostly bino or singlino. As an interesting aside we
also find a region of low $\tan \beta$ and small singlino mass parameter where
a well-tempered neutralino avoids all cosmological and direct detection
constraints.Comment: 35 pages, 15 figure
$AdS_2$ holography is (non-)trivial for (non-)constant dilaton

We study generic two-dimensional dilaton gravity with a Maxwell field and
prove its triviality for constant dilaton boundary conditions, despite of the
appearance of a Virasoro algebra with non-zero central charge. We do this by
calculating the canonical boundary charges, which turn out to be trivial, and
by calculating the quantum gravity partition function, which turns out to be
unity. We show that none of the following modifications changes our
conclusions: looser boundary conditions, non-linear interactions of the Maxwell
field with the dilaton, inclusion of higher spin fields, inclusion of generic
gauge fields. Finally, we consider specifically the charged Jackiw--Teitelboim
model, whose holographic study was pioneered by Hartman and Strominger, and
show that it is non-trivial for certain linear dilaton boundary conditions. We
calculate the entropy from the Euclidean path integral, using Wald's method and
exploiting the chiral Cardy formula. The macroscopic and microscopic results
for entropy agree with each other.Comment: added a reference; corrected typo
Partition function of N=2* SYM on a large four-sphere

We examine the partition function of N=2* supersymmetric SU(N) Yang-Mills
theory on the four-sphere in the large radius limit. We point out that the
large radius partition function, at fixed N, is computed by saddle points lying
on particular walls of marginal stability on the Coulomb branch of the theory
on R^4. For N an even (odd) integer and \theta_YM=0, (\pi), these include a
point of maximal degeneration of the Donagi-Witten curve to a torus where BPS
dyons with electric charge [N/2] become massless. We argue that the dyon
singularity is the lone saddle point in the SU(2) theory, while for SU(N) with
N>2, we characterize potentially competing saddle points by obtaining the
relations between the Seiberg-Witten periods at such points. Using Nekrasov's
instanton partition function, we solve for the maximally degenerate saddle
point and obtain its free energy as a function of g_YM and N, and show that the
results are "large-N exact". In the large-N theory our results provide
analytical expressions for the periods/eigenvalues at the maximally degenerate
saddle point, precisely matching previously known formulae following from the
correspondence between N=2* theory and the elliptic Calogero-Moser integrable
model. The maximally singular point ceases to be a saddle point of the
partition function above a critical value of the coupling, in agreement with
the recent findings of Russo and Zarembo.Comment: Replaced with version to appear in JHEP. Typos corrected, added
  discussion on S-duality of the partition function. 47 pages, 8 figures, uses
  late
Topological Field Theory Amplitudes for $A_{N-1}$ Fibration

We study the partition function ${\cal N}=1$ 5D $U(N)$ gauge theory with $g$
adjoint hypermultiplets and show that for massless adjoint hypermultiplets it
is equal to the partition function of a two dimensional topological field on a
genus $g$ Riemann surface. We describe the topological field theory by its
amplitudes associated with cap, propagator and pair of pants. These basic
amplitudes are open topological string amplitudes associated with certain
Calabi-Yau threefolds in the presence of Lagrangian branes.Comment: 24 pages, clarifying remarks and references adde
Consistent ${\cal N}=8$ truncation of massive IIA on $S^6$

Massive type IIA supergravity is shown to admit a consistent truncation on
the six-sphere to maximal supergravity in four dimensions with a dyonic ISO(7)
gauging. We obtain the complete, non-linear embedding of all the $D=4$ fields
into the IIA metric and form potentials, and show its consistency. We first
rewrite the IIA theory in an $\textrm{SO}(1,3) \times
\textrm{SL}(7)$--covariant way. Then, we employ an ${\cal N}=8$
SL(7)--covariant restriction of the $D=4$ tensor hierarchy in order to find the
full embedding. The redundant $D=4$ degrees of freedom introduced by the tensor
hierarchy can be eliminated by writing the embedding in terms of the field
strengths and exploiting the restricted duality hierarchy. In particular,
closed expressions for the Freund-Rubin term are found using this technique
which reveal a pattern valid for other truncations. Finally, we show that the
present ${\cal N}=8$ truncation of massive IIA on $S^6$ and the ${\cal N}=2$
truncation obtained when $S^6$ is equipped with its nearly-K\"ahler structure,
overlap in the ${\cal N}=1$, G$_2$--invariant sector of the former.Comment: 43 pages; v2: minor corrections and references added. Version to be
  published in JHE
Null warped AdS in higher spin gravity

We equip three-dimensional spin-3 gravity in the principal embedding with a
new set of boundary conditions that we call "asymptotically null warped AdS".
We find a chiral copy of the Polyakov-Bershadsky algebra as asymptotic symmetry
algebra, reminiscent of the situation in topologically massive gravity with
strict null warped AdS boundary conditions. We prove the invertibility of the
map between zuvielbein and metric variables and construct a global gauge
transformation to half of AdS spin-3 gravity in the diagonal embedding. This
explains why the theory is chiral and why the Polyakov-Bershadsky algebra
arises. We then introduce chemical potentials, derive the entropy, free energy,
and the holographic response functions, and conclude with a discussion