pinecone/core-2020-05-10-deduplication huggingface dataset:
Inflation with stable anisotropic hair

The final publication is available at link.springer.com; http://link.springer.com/article/10.1007/JHEP11%282011%29146.Recently an inflationary model with a vector field coupled to the inflaton was proposed and the phenomenology studied for the Bianchi type I spacetime. It was found that the model demonstrates a counter-example to the cosmic no-hair theorem since there exists a stable anisotropically inflationary fix-point. One of the great triumphs of inflation, however, is that it explains the observed flatness and isotropy of the universe today without requiring special initial conditions. Any acceptable model for inflation should thus explain these observations in a satisfactory way. To check whether the model meets this requirement, we introduce curvature to the background geometry and consider axisymmetric spacetimes of Bianchi type II,III and the Kantowski-Sachs metric. We show that the anisotropic Bianchi type I fix-point is an attractor for the entire family of such spacetimes. The model is predictive in the sense that the universe gets close to this fix-point after a few e-folds for a wide range of initial conditions. If inflation lasts for N e-folds, the curvature at the end of inflation is typically of order ~ e −2N . The anisotropy in the expansion rate at the end of inflation, on the other hand, while being small on the one-percent level, is highly significant. We show that after the end of inflation there will be a period of isotropization lasting for ∼23N e-folds. After that the shear scales as the curvature and becomes dominant around N e-folds after the end of inflation. For plausible bounds on the reheat temperature the minimum number of e-folds during inflation, required for consistency with the isotropy of the supernova Ia data, lays in the interval (21, 48). Thus the results obtained for our restricted class of spacetimes indicates that inflation with anisotropic hair is cosmologically viable
Measurement of energy flow at large pseudorapidities in pp collisions at √s = 0.9 and 7 TeV

The energy flow, dE/d(eta), is studied at large pseudorapidities in proton-proton collisions at the LHC, for centre-of-mass energies of 0.9 and 7 TeV. The measurements are made in the pseudorapidity range 3.15 < |eta| < 4.9, for both minimum-bias events and events with at least two high-momentum jets, using the CMS detector. The data are compared to various pp Monte Carlo event generators whose theoretical models and input parameter values are sensitive to the energy-flow measurements. Inclusion of multiple-parton interactions in the Monte Carlo event generators is found to improve the description of the energy-flow measurements
The Imperfect Fluid behind Kinetic Gravity Braiding

We present a standard hydrodynamical description for non-canonical scalar
field theories with kinetic gravity braiding. In particular, this picture
applies to the simplest galileons and k-essence. The fluid variables not only
have a clear physical meaning but also drastically simplify the analysis of the
system. The fluid carries charges corresponding to shifts in field space. This
shift-charge current contains a spatial part responsible for diffusion of the
charges. Moreover, in the incompressible limit, the equation of motion becomes
the standard diffusion equation. The fluid is indeed imperfect because the
energy flows neither along the field gradient nor along the shift current. The
fluid has zero vorticity and is not dissipative: there is no entropy
production, the energy-momentum is exactly conserved, the temperature vanishes
and there is no shear viscosity. Still, in an expansion around a perfect fluid
one can identify terms which correct the pressure in the manner of bulk
viscosity. We close by formulating the non-trivial conditions for the
thermodynamic equilibrium of this imperfect fluid.Comment: 23 pages plus appendices. New version includes extended discussion on
  diffusion and dynamics in alternative frames, as well as additional
  references. v3 reflects version accepted for publication in JHEP: minor
  comments added regarding suitability to numerical approache
Six and seven loop Konishi from Luscher corrections

In the present paper we derive six and seven loop formulas for the anomalous
dimension of the Konishi operator in N=4 SYM from string theory using the
technique of Luscher corrections. We derive analytically the integrand using
the worldsheet S-matrix and evaluate the resulting integral and infinite sum
using a combination of high precision numerical integration and asymptotic
expansion. We use this high precision numerical result to fit the integer
coefficients of zeta values in the final analytical answer. The presented six
and seven loop results can be used as a cross-check with FiNLIE on the string
theory side, or with direct gauge theory computations. The seven loop level is
the theoretical limit of this Luscher approach as at eight loops
double-wrapping corrections will appear.Comment: 18 pages, typos correcte
Composite Higgs Sketch

The coupling of a composite Higgs to the standard model fields can deviate
substantially from the standard model values. In this case perturbative
unitarity might break down before the scale of compositeness is reached, which
would suggest that additional composites should lie well below this scale. In
this paper we account for the presence of an additional spin 1 custodial
triplet of rhos. We examine the implications of requiring perturbative
unitarity up to the compositeness scale and find that one has to be close to
saturating certain unitarity sum rules involving the Higgs and the rho
couplings. Given these restrictions on the parameter space we investigate the
main phenomenological consequences of the spin 1 triplet. We find that they can
substantially enhance the Higgs di-photon rate at the LHC even with a reduced
Higgs coupling to gauge bosons. The main existing LHC bounds arise from
di-boson searches, especially in the experimentally clean channel where the
charged rhos decay to a W-boson and a Z, which then decay leptonically. We find
that a large range of interesting parameter space with 700 GeV < m(rho) < 2 TeV
is currently experimentally viable.Comment: 37 pages, 12 figures; v4: sum rule corrected, conclusions unchange
On Seven-Brane Dependent Instanton Prefactors in F-theory

We study the moduli-dependent prefactor of M5-instanton corrections to the
superpotential in four-dimensional F-theory compactifications. In light of the
M-theory and type IIb limits and also heterotic duality, we propose that the
explicit moduli dependence of the prefactor can be computed by a study of zero
modes localized at intersections between the instanton and seven-branes. We
present an instanton prefactor in an E_6 F-theory GUT which does not admit a
heterotic dual and show that it vanishes if and only if a point of E_8
enhancement is present in the instanton worldvolume. More generically, we
discuss the relationship between points of E_8 and superpotential zeroes and
give sufficient conditions for such a point to cause a zero, even for an SU(5)
GUT. We scan a large class of compactifications for instanton physics and
demonstrate that many instantons have the same prefactor structure. We discuss
the associated implications and complications for moduli stabilization. We
present an explicit resolution and construction of G-flux in a generic E_6 GUT
and identify a global compactification of the local model spectral cover which
happens to facilitate prefactor computations. Via a Leray spectral sequence, we
demonstrate the relationship between right-movers of heterotic worldsheet
instantons, 3-3 strings of euclidean D3 instantons, and the Fermi zero modes of
M5-instantons.Comment: 86 page
The Yang-Mills gradient flow in finite volume

The Yang-Mills gradient flow is considered on the four dimensional torus T 4 for SU(N) gauge theory coupled to N f flavors of massless fermions in arbitrary representations. The small volume dynamics is dominated by the constant gauge fields. The expectation value of the field strength tensor squared TrF μν F μν (t) is calculated for positive flow time t by treating the non-zero gauge modes perturbatively and the zero modes exactly. The finite volume correction to the infinite volume result is found to contain both algebraic and exponential terms. The leading order result is then used to define a one parameter family of running coupling schemes in which the coupling runs with the linear size of the box. The new scheme is tested numerically in SU(3) gauge theory coupled to N f = 4 flavors of massless fundamental fermions. The calculations are performed at several lattice spacings with a controlled continuum extrapolation. The continuum result agrees with the perturbative prediction for small renormalized coupling as expected
Duality between N=5 and N=6 Chern-Simons matter theory

We provide evidences for the duality between ${\cal N}=6$ $U(M)_{4} \times
U(N)_{-4}$ Chern-Simons matter theory and ${\cal N}=5$ $O(\hat{M})_{2} \times
USp(2\hat{N})_{-1}$ theory for a suitable $\hat{M},\hat{N}$ by working out the
superconformal index, which shows perfect matching. For ${\cal N}=5$ theories,
we show that supersymmetry is enhanced to ${\cal N}=6$ by explicitly
constructing monopole operators filling in $SO(6)_R$ $R$-currents. Finally we
work out the large $N$ index of $O(2N)_{2k} \times USp(2N)_{-k}$ and show that
it exactly matches with the gravity index on $AdS_4 \times S^7/D_k$, which
further provides additional evidence for the duality between the ${\cal N}=5$
and ${\cal N}=6$ theory for $k=1$Comment: 15 pages; references adde
Probing the charged Higgs boson at the LHC in the CP-violating type-II
  2HDM

We present a phenomenological study of a CP-violating two-Higgs-doublet Model
with type-II Yukawa couplings at the Large Hadron Collider (LHC). In the light
of recent LHC data, we focus on the parameter space that survives the current
and past experimental constraints as well as theoretical bounds on the model.
Once the phenomenological scenario is set, we analyse the scope of the LHC in
exploring this model through the discovery of a charged Higgs boson produced in
association with a W boson, with the former decaying into the lightest neutral
Higgs and a second W state, altogether yielding a b\bar b W^+W^- signature, of
which we exploit the W^+W^- semileptonic decays.Comment: 37 pages, 16 figures; v2 updated treatment of LHC constraint
Ground states of supersymmetric Yang-Mills-Chern-Simons theory

We consider minimally supersymmetric Yang-Mills theory with a Chern-Simons
term on a flat spatial two-torus. The Witten index may be computed in the weak
coupling limit, where the ground state wave-functions localize on the moduli
space of flat gauge connections. We perform such computations by considering
this moduli space as an orbifold of a certain flat complex torus. Our results
agree with those obtained previously by instead considering the moduli space as
a complex projective space. An advantage of the present method is that it
allows for a more straightforward determination of the discrete electric 't
Hooft fluxes of the ground states in theories with non-simply connected gauge
groups. A consistency check is provided by the invariance of the results under
the mapping class group of a (Euclidean) three-torus.Comment: 18 page
The Sound of Topology in the AdS/CFT Correspondence

Using the gauge/gravity correspondence, we study the properties of 2-point
correlation functions of finite-temperature strongly coupled gauge field
theories, defined on a curved space of general spatial topology with a dual
black hole description. We derive approximate asymptotic expressions for the
correlation functions and their poles, supported by exact numerical
calculations, and study their dependence on the dimension of spacetime and the
spatial topology. The asymptotic structure of the correlation functions depends
on the relation between the spatial curvature and the temperature, and is
noticeable when they are of the same order. In the case of a hyperbolic
topology, a specific temperature is identified for which exact analytical
solutions exist for all types of perturbations. The asymptotic structure of the
correlation functions poles is found to behave in a non-smooth manner when
approaching this temperature.Comment: 65 pages, LaTeX, 21 figures, 1 table; fixed a small error in
  subsection 3.
Emergence of Space and Spacetime Dynamics of Friedmann-Robertson-Walker
  Universe

In a recent paper [arXiv:1206.4916] by T. Padmanabhan, it was argued that our
universe provides an ideal setup to stress the issue that cosmic space is
emergent as cosmic time progresses and that the expansion of the universe is
due to the difference between the number of degrees of freedom on a holographic
surface and the one in the emerged bulk. In this note following this proposal
we obtain the Friedmann equation of a higher dimensional
Friedmann-Robertson-Walker universe. By properly modifying the volume increase
and the number of degrees of freedom on the holographic surface from the
entropy formulas of black hole in the Gauss-Bonnet gravity and more general
Lovelock gravity, we also get corresponding dynamical equations of the universe
in those gravity theories.Comment: Latex 9 pages without figur
Thermodynamics of Black Hole Horizons and Kerr/CFT Correspondence

In this paper we investigate the thermodynamics of the inner horizon and its
implication on the holographic description of the black hole. We focus on the
black holes with two physical horizons. Under reasonable assumption, we prove
that the first law of thermodynamics of the outer horizon always indicates that
of the inner horizon. As a result, the fact that the area product being
mass-independent is equivalent to the relation $T_+S_+=T_-S_-$, with $T_\pm$
and $S_\pm$ being the Hawking temperatures and the entropies of the outer and
inner horizon respectively. We find that the mass-independence of area product
breaks down in general Myers-Perry black holes with spacetime dimension
$d\geq6$ and Kerr-AdS black holes with $d\geq4$.
  Moreover we discuss the implication of the first laws of the outer and inner
horizons on the thermodynamics of the right- and left-moving sectors of dual
CFT in Kerr/CFT correspondence. We show that once the relation $T_+S_+=T_-S_-$
is satisfied, the central charges of two sectors must be same. Furthermore from
the thermodynamics relations, we read the dimensionless temperatures of
microscopic CFT, which are in exact agreement with the ones obtained from
hidden conformal symmetry in the low frequency scattering off the black holes,
and then determine the central charges. This method works well in well-known
cases in Kerr/CFT correspondence, and reproduce successfully the holographic
pictures for 4D Kerr-Newman and 5D Kerr black holes. We go on to predict the
central charges and temperatures of a possible holographic CFT description dual
to 5D doubly rotating black ring.Comment: 29 pages; match published versio
Higgs discovery: the beginning or the end of natural EWSB?

We use global fits to analyze the most recent Higgs data from ATLAS, CMS and
Tevatron and compare the Standard Model (SM) prediction with natural extensions
of the SM. In particular we study wide classes of composite Higgs models based
on different coset structures (leading at low energy to different Higgs sectors
including extra singlets and Higgs doublets) and different coupling structures
of the elementary fermions to the strong sector. We point out in what
situations the composite models could improve (or worsen) the fit to the data
and compare with similar trends in the MSSM.Comment: Updated data from ICHEP2012; typos fixed and references adde
Quantum Geometry of Refined Topological Strings

We consider branes in refined topological strings. We argue that their
wave-functions satisfy a Schr\"odinger equation depending on multiple times and
prove this in the case where the topological string has a dual matrix model
description. Furthermore, in the limit where one of the equivariant rotations
approaches zero, the brane partition function satisfies a time-independent
Schroedinger equation. We use this observation, as well as the back reaction of
the brane on the closed string geometry, to offer an explanation of the
connection between integrable systems and N=2 gauge systems in four dimensions
observed by Nekrasov and Shatashvili.Comment: 64 pages, 2 figure
Higher-order relativistic corrections to gluon fragmentation into
  spin-triplet S-wave quarkonium

We compute the relative-order-v^4 contribution to gluon fragmentation into
quarkonium in the 3S1 color-singlet channel, using the nonrelativistic QCD
(NRQCD) factorization approach. The QCD fragmentation process contains infrared
divergences that produce single and double poles in epsilon in 4-2epsilon
dimensions. We devise subtractions that isolate the pole contributions, which
ultimately are absorbed into long-distance NRQCD matrix elements in the NRQCD
matching procedure. The matching procedure involves two-loop renormalizations
of the NRQCD operators. The subtractions are integrated over the phase space
analytically in 4-2epsilon dimensions, and the remainder is integrated over the
phase-space numerically. We find that the order-v^4 contribution is enhanced
relative to the order-v^0 contribution. However, the order-v^4 contribution is
not important numerically at the current level of precision of
quarkonium-hadroproduction phenomenology. We also estimate the contribution to
hadroproduction from gluon fragmentation into quarkonium in the 3PJ color-octet
channel and find that it is significant in comparison to the complete
next-to-leading-order-in-alpha_s contribution in that channel.Comment: 41 pages, 8 figures, 3 tables, minor corrections, version published
  in JHE
Holographic Descriptions of Black Rings

In this paper, we investigate the holographic descriptions of two kinds of
black rings, the neutral doubly rotating black ring and the dipole charged
black ring. For generic nonextremal black rings, the information of holographic
CFT duals, including the central charges and left- and right-moving
temperatures, could be read from the thermodynamics at the outer and inner
horizons, as suggested in arXiv:1206.2015. To confirm these pictures, we study
the extreme black rings in the well-established formalism. We compute the
central charges of dual CFTs by doing asymptotic symmetry group analysis in the
stretched horizon formalism, and find exact agreements. Moreover, we study the
superradiant scattering of a scalar field off the near-extremal black rings and
obtain the scattering amplitudes, which are in good match with the CFT
predictions.Comment: 23 pages, no figures; some text overlap with arXiv:1206.201
G-flux and Spectral Divisors

We propose a construction of G-flux in singular elliptic Calabi-Yau fourfold
compactifications of F-theory, which in the local limit allow a spectral cover
description. The main tool of construction is the so-called spectral divisor in
the resolved Calabi-Yau geometry, which in the local limit reduces to the Higgs
bundle spectral cover. We exemplify the workings of this in the case of an E_6
singularity by constructing the resolved geometry, the spectral divisor and in
the local limit, the spectral cover. The G-flux constructed with the spectral
divisor is shown to be equivalent to the direct construction from suitably
quantized linear combinations of holomorphic surfaces in the resolved geometry,
and in the local limit reduces to the spectral cover flux.Comment: 30 page
Wilson Lines and a Canonical Basis of SU(4) Heterotic Standard Models

The spontaneous breaking of SU(4) heterotic standard models by Z_3 x Z_3
Wilson lines to the MSSM with three right-handed neutrino supermultiplets and
gauge group SU(3)_C x SU(2)_L x U(1) x U(1) is explored. The two-dimensional
subspace of the Spin(10) Lie algebra that commutes with su(3)_C + su(2)_L is
analyzed. It is shown that there is a unique basis for which the initial soft
supersymmetry breaking parameters are uncorrelated and for which the U(1) x
U(1) field strengths have no kinetic mixing at any scale. If the Wilson lines
"turn on" at different scales, there is an intermediate regime with either a
left-right or a Pati-Salam type model. We compute their spectra directly from
string theory, and adjust the associated mass parameter so that all gauge
parameters exactly unify. A detailed analysis of the running gauge couplings
and soft gaugino masses is presented.Comment: 59 pages, 9 figure
Parameters, limits and higher derivative type II string corrections

String theory in d dimensions has n+1=11-d parameters that may be thought of
as being inherited from the geometry of an n+1 torus which may be used to
construct the theory using dimensional reduction from eleven dimensions. We
give the precise relationship between these parameters and the expectation
values of the scalar fields that parameterise the E_{n+1} coset of the d
dimensional theory. This allows us to examine all possible limits of the
automorphic forms which occur as the coefficient functions of the higher
derivative corrections to the d dimensional type II string effective action.Comment: 73 pages. Typos fixed and other minor correction
Hyperscaling-Violation on Probe D-Branes

For the field theories dual to D3/D7- and D3/D5-brane systems we find
non-relativistic finite density fixed points exhibiting a violation of
hyperscaling. This violation is measured by the critical exponent $\theta=1$
while the dynamical critical exponent is $z=2$. At zero temperature we compute
the thermodynamic potentials, the speed of normal sound, and the speed of zero
sound for both these massive D3/D(2n+1)-brane systems near their
non-relativistic fixed points. Moreover, we determine the first correction to
the free energy for small temperatures yielding the critical exponents $\alpha$
and $\nu$.Comment: v1: 22 pages, 1 figure; v2: 23 pages, references added, extended
  introductio
Topological charge density correlator in Lattice QCD with two flavours
  of unimproved Wilson fermions

We study the two-point Topological Charge Density Correlator (TCDC) in
lattice QCD with two degenerate flavours of unimproved Wilson fermions and
Wilson gauge action at two values of lattice spacings and different volumes,
for a range of quark masses. Configurations are generated with DDHMC algorithm
and smoothed with HYP smearing. In order to shed light on the mechanisms
leading to the observed suppression of topological susceptibility with respect
to the decreasing quark mass and decreasing volume, in this work, we carry out
a detailed study of the two-point TCDC. We have shown that, (1) the TCDC is
negative beyond a positive core and radius of the core shrinks as lattice
spacing decreases, (2) as the volume decreases, the magnitude of the contact
term and the radius of the positive core decrease and the magnitude of the
negative peak increases resulting in the suppression of the topological
susceptibility as the volume decreases, (3) the contact term and radius of the
positive core decrease with decreasing quark mass at a given lattice spacing
and the negative peak increases with decreasing quark mass resulting in the
suppression of the topological susceptibility with decreasing quark mass, (4)
increasing levels of smearing suppresses the contact term and the negative peak
keeping the susceptibility intact and (5) both the contact term and the
negative peak diverge in nonintegrable fashion as lattice spacing decreases. It
is gratifying to note that observations similar to 1 and 5 have been made using
topological charge density operator based on chiral fermion. The observations 2
and 3 may be confirmed more precisely by using formulations based on chiral
fermions.Comment: some qualifying remarks are added, results unchange