pinecone/core-2020-05-10-deduplication huggingface dataset:
Non-perturbative improvement of quark mass renormalization in
  two-flavour lattice QCD

We non-perturbatively determine the renormalization constant and the
improvement coefficients relating the renormalized current and subtracted quark
mass in O(a) improved two-flavour lattice QCD. We employ the Schr\"odinger
functional scheme and fix the physical extent of the box by working at a
constant value of the renormalized coupling. Our calculation yields results
which cover two regions of bare parameter space. One is the weak-coupling
region suitable for volumes of about half a fermi. By making simulations in
this region, quarks as heavy as the bottom can be propagated with the full
relativistic QCD action and renormalization problems in HQET can be solved
non-perturbatively by a matching to QCD in finite volume. The other region
refers to the common parameter range in large-volume simulations of two-flavour
lattice QCD, where our results have particular relevance for charm physics
applications.Comment: 31 pages including figures and tables, latex2e, uses JHEP3.cls;
  revised version published in JHEP, clarifying remarks and references added;
  typo(s) corrected, especially in eq. (3.10
Refractive index in holographic superconductors

With the probe limit, we investigate the behavior of the electric
permittivity and effective magnetic permeability and related optical properties
in the s-wave holographic superconductors. In particular, our result shows that
unlike the strong coupled systems which admit a gravity dual of charged black
holes in the bulk, the electric permittivity and effective magnetic
permeability are unable to conspire to bring about the negative
Depine-Lakhtakia index at low frequencies, which implies that the negative
phase velocity does not appear in the holographic superconductors under such a
situation.Comment: JHEP style, 1+15 pages, 11 figures, version to appear in JHE
Kerr-CFT From Black-Hole Thermodynamics

We analyze the near-horizon limit of a general black hole with two commuting
killing vector fields in the limit of zero temperature. We use black hole
thermodynamics methods to relate asymptotic charges of the complete spacetime
to those obtained in the near-horizon limit. We then show that some
diffeomorphisms do alter asymptotic charges of the full spacetime, even though
they are defined in the near horizon limit and, therefore, count black hole
states. We show that these conditions are essentially the same as considered in
the Kerr/CFT corresponcence. From the algebra constructed from these
diffeomorphisms, one can extract its central charge and then obtain the black
hole entropy by use of Cardy's formula.Comment: 19 pages, JHEP3, no figures. V2: References added, small typos fixe
Symplectic Three-Algebra Unifying N=5,6 Superconformal
  Chern-Simons-Matter Theories

We define a 3-algebra with structure constants being symmetric in the first
two indices. We also introduce an invariant anti-symmetric tensor into this
3-algebra and call it a symplectic 3-algebra. The general N=5 superconformal
Chern-Simons-matter (CSM) theory with SO(5) R-symmetry in three dimensions is
constructed by using this algebraic structure. We demonstrate that the
supersymmetry can be enhanced to N=6 if the sympelctic 3-algebra and the fields
are decomposed in a proper fashion. By specifying the 3-brackets, some
presently known N=5, 6 superconformal theories are described in terms of this
unified 3-algebraic framework. These include the N=5, Sp(2N) X O(M) CSM theory
with SO(5) R-symmetry , the N=6, Sp(2N) X U(1) CSM theory with SU(4)
R-symmetry, as well as the ABJM theory as a special case of U(M) X U(N) theory
with SU(4) R-symmetry.Comment: 31 pages, minor changes, final results remain the sam
Holography of Charged Dilaton Black Holes

We study charged dilaton black branes in $AdS_4$. Our system involves a
dilaton $\phi$ coupled to a Maxwell field $F_{\mu\nu}$ with dilaton-dependent
gauge coupling, ${1\over g^2} = f^2(\phi)$. First, we find the solutions for
extremal and near extremal branes through a combination of analytical and
numerical techniques. The near horizon geometries in the simplest cases, where
$f(\phi) = e^{\alpha\phi}$, are Lifshitz-like, with a dynamical exponent $z$
determined by $\alpha$. The black hole thermodynamics varies in an interesting
way with $\alpha$, but in all cases the entropy is vanishing and the specific
heat is positive for the near extremal solutions. We then compute conductivity
in these backgrounds. We find that somewhat surprisingly, the AC conductivity
vanishes like $\omega^2$ at T=0 independent of $\alpha$. We also explore the
charged black brane physics of several other classes of gauge-coupling
functions $f(\phi)$. In addition to possible applications in AdS/CMT, the
extremal black branes are of interest from the point of view of the attractor
mechanism. The near horizon geometries for these branes are universal,
independent of the asymptotic values of the moduli, and describe generic
classes of endpoints for attractor flows which are different from $AdS_2\times
R^2$.Comment: 33 pages, 3 figures, LaTex; v2, references added; v3, more refs
  added; v4, refs added, minor correction
On Instanton Effects in F-theory

We revisit the issue of M5-brane instanton corrections to the superpotential
in F-theory compactifications on elliptically fibered Calabi-Yau fourfolds.
Elaborating on concrete geometries, we compare the instanton zero modes for
non-perturbative F-theory models with the zero modes in their perturbative Sen
limit. The fermionic matter zero modes localized on the intersection of the
instanton with the space-time filling D7-branes show up in a geometric way in
F-theory. Methods for their computation are developed and, not surprisingly,
exceptional gauge group structures do appear. Finally, quite intriguing
geometrical aspects of the one-loop determinant are discussed.Comment: 52 pages, 8 figures, 13 tables; v2: extended discussion of matter
  zero modes, refs added; v3: sections 3.3 + 4.1 restructure
Scattering AMplitudes from Unitarity-based Reduction Algorithm at the
  Integrand-level

SAMURAI is a tool for the automated numerical evaluation of one-loop
corrections to any scattering amplitudes within the dimensional-regularization
scheme. It is based on the decomposition of the integrand according to the
OPP-approach, extended to accommodate an implementation of the generalized
d-dimensional unitarity-cuts technique, and uses a polynomial interpolation
exploiting the Discrete Fourier Transform. SAMURAI can process integrands
written either as numerator of Feynman diagrams or as product of tree-level
amplitudes. We discuss some applications, among which the 6- and 8-photon
scattering in QED, and the 6-quark scattering in QCD. SAMURAI has been
implemented as a Fortran90 library, publicly available, and it could be a
useful module for the systematic evaluation of the virtual corrections oriented
towards automating next-to-leading order calculations relevant for the LHC
phenomenology.Comment: 35 pages, 7 figure
Single production of sleptons with polarized tops at the Large Hadron
  Collider

We study the production of a single charged slepton in association with a top
quark in a R-parity violating supersymmetric model with lepton number violating
interactions at the Large Hadron Collider. We find that the longitudinal
polarization asymmetry of the top quark in such a production mode is
significantly different from that in the production of a single top or a top
pair in the Standard Model for a wide range of slepton masses. Our signal
analysis shows that the top-slepton associate production leads to final states
with distinct kinematic signatures, which differ from the Standard Model
background.Comment: Latex2E, 26 pages, 12 eps figures. Minor revisions in text; added
  figures and section
Spin 3 cubic vertices in a frame-like formalism

Till now most of the results on interaction vertices for massless higher spin
fields were obtained in a metric-like formalism using completely symmetric
(spin-)tensors. In this, the Lagrangians turn out to be very complicated and
the main reason is that the higher the spin one want to consider the more
derivatives one has to introduce. In this paper we show that such
investigations can be greatly simplified if one works in a frame-like
formalism. As an illustration we consider massless spin 3 particle and
reconstruct a number of vertices describing its interactions with lower spin 2,
1 and 0 ones. In all cases considered we give explicit expressions for the
Lagrangians and gauge transformations and check that the algebra of gauge
transformations is indeed closed.Comment: 17 pades, no figure
Counting defects with the two-point correlator

We study how topological defects manifest themselves in the equal-time
two-point field correlator. We consider a scalar field with Z_2 symmetry in 1,
2 and 3 spatial dimensions, allowing for kinks, domain lines and domain walls,
respectively. Using numerical lattice simulations, we find that in any number
of dimensions, the correlator in momentum space is to a very good approximation
the product of two factors, one describing the spatial distribution of the
defects and the other describing the defect shape. When the defects are
produced by the Kibble mechanism, the former has a universal form as a function
of k/n, which we determine numerically. This signature makes it possible to
determine the kink density from the field correlator without having to resort
to the Gaussian approximation. This is essential when studying field dynamics
with methods relying only on correlators (Schwinger-Dyson, 2PI).Comment: 11 pages, 7 figures
Hidden Conformal Symmetry of the Kerr-Newman Black Hole

We investigate the hidden conformal symmetry of the 4-dimensional
non-extremal Kerr-Newman (KN) black hole with the idea of the near-region
Kerr/CFT correspondence proposed by Castro, Maloney and Strominger in
arXiv:1004.0996[hep-th]. The near-region KN black hole is dual to a 2D CFT with
left and right temperatures $T_L=(2 M^2-Q^2)/(4\pi J)$ and
$T_R=\sqrt{M^4-J^2-M^2Q^2}/(2\pi J)$. Furthermore, we reproduce the microscopic
entropy of the KN black hole via the Cardy formula, which is in agreement with
the macroscopic Bekenstein-Hawking entropy and precisely match the absorption
cross section of a near-region scalar field in the KN black hole with the
finite-temperature absorption cross section for a 2D CFT.Comment: 11 pages, typos corrected, accepted by JHE
Next-to-leading order QCD corrections to Higgs boson production in
  association with a photon via weak-boson fusion at the LHC

Higgs boson production in association with a hard central photon and two
forward tagging jets is expected to provide valuable information on Higgs boson
couplings in a range where it is difficult to disentangle weak-boson fusion
processes from large QCD backgrounds. We present next-to-leading order QCD
corrections to Higgs production in association with a photon via weak-boson
fusion at a hadron collider in the form of a flexible parton-level Monte Carlo
program. The QCD corrections to integrated cross sections are found to be small
for experimentally relevant selection cuts, while the shape of kinematic
distributions can be distorted by up to 20% in some regions of phase space.
Residual scale uncertainties at next-to-leading order are at the few-percent
level.Comment: 17 pages, 7 figures, 1 tabl
On O(1) contributions to the free energy in Bethe Ansatz systems: the
  exact g-function

We investigate the sub-leading contributions to the free energy of Bethe
Ansatz solvable (continuum) models with different boundary conditions. We show
that the Thermodynamic Bethe Ansatz approach is capable of providing the O(1)
pieces if both the density of states in rapidity space and the quadratic
fluctuations around the saddle point solution to the TBA are properly taken
into account. In relativistic boundary QFT the O(1) contributions are directly
related to the exact g-function. In this paper we provide an all-orders proof
of the previous results of P. Dorey et al. on the g-function in both massive
and massless models. In addition, we derive a new result for the g-function
which applies to massless theories with arbitrary diagonal scattering in the
bulk.Comment: 28 pages, 2 figures, v2: minor corrections, v3: minor corrections and
  references adde
On the Heterotic World-sheet Instanton Superpotential and its individual
  Contributions

For supersymmetric heterotic string compactifications on a Calabi-Yau
threefold $X$ endowed with a vector bundle $V$ the world-sheet superpotential
$W$ is a sum of contributions from isolated rational curves $\C$ in $X$; the
individual contribution is given by an exponential in the K\"ahler class of the
curve times a prefactor given essentially by the Pfaffian which depends on the
moduli of $V$ and the complex structure moduli of $X$. Solutions of $DW=0$ (or
even of $DW=W=0$) can arise either by nontrivial cancellations between the
individual terms in the summation over all contributing curves or because each
of these terms is zero already individually. Concerning the latter case
conditions on the moduli making a single Pfaffian vanish (for special moduli
values) have been investigated. However, even if corresponding moduli -
fulfilling these constraints - for the individual contribution of one curve are
known it is not at all clear whether {\em one} choice of moduli exists which
fulfills the corresponding constraints {\em for all contributing curves
simultaneously}. Clearly this will in general happen only if the conditions on
the 'individual zeroes' had already a conceptual origin which allows them to
fit together consistently. We show that this happens for a class of cases. In
the special case of spectral cover bundles we show that a relevant solution set
has an interesting location in moduli space and is related to transitions which
change the generation number.Comment: 47 page
Large entropy production inside black holes: a simple model

Particles dropped into a rotating black hole can collide near the inner
horizon with enormous energies. The entropy produced by these collisions can be
several times larger than the increase in the horizon entropy due to the
addition of the particles. In this paper entropy is produced by releasing large
numbers of neutrons near the outer horizon of a rotating black hole such that
they collide near the inner horizon at energies similar to those achieved at
the Relativistic Heavy Ion Collider. The increase in horizon entropy is
approximately 80 per dropped neutron pair, while the entropy produced in the
collisions is 160 per neutron pair. The collision entropy is produced inside
the horizon, so this excess entropy production does not violate Bousso's bound
limiting the entropy that can go through the black hole's horizon. The
generalized laws of black hole thermodynamics are obeyed. No individual
observer inside the black hole sees a violation of the second law of
thermodynamicsComment: 10 page
Colour-electric spectral function at next-to-leading order

The spectral function related to the correlator of two colour-electric fields
along a Polyakov loop determines the momentum diffusion coefficient of a heavy
quark near rest with respect to a heat bath. We compute this spectral function
at next-to-leading order, O(alpha_s^2), in the weak-coupling expansion. The
high-frequency part of our result (omega >> T), which is shown to be
temperature-independent, is accurately determined thanks to asymptotic freedom;
the low-frequency part of our result (omega << T), in which Hard Thermal Loop
resummation is needed in order to cure infrared divergences, agrees with a
previously determined expression. Our result may help to calibrate the overall
normalization of a lattice-extracted spectral function in a perturbative
frequency domain T << omega << 1/a, paving the way for a non-perturbative
estimate of the momentum diffusion coefficient at omega -> 0. We also evaluate
the colour-electric Euclidean correlator, which could be directly compared with
lattice simulations. As an aside we determine the Euclidean correlator in the
lattice strong-coupling expansion, showing that through a limiting procedure it
can in principle be defined also in the confined phase of pure Yang-Mills
theory, even if a practical measurement could be very noisy there.Comment: 38 page
Semiclassical Regge trajectories of noncritical string and large-N QCD

By properly treating the path integral over the boundary value of the
Liouville field (associated with reparametrizations of the boundary contour) in
open string theory, we derive consistent off-shell scattering amplitudes in
d=26 dimensions. In d<26 we consider a recently proposed boundary ansatz which
reproduces a semiclassical correction to the classical string (known as the
Luscher term) and obtain in the semiclassical approximation a linear Regge
trajectory with the intercept (d-2)/24. We associate it with the
quark-antiquark Regge trajectory in large-N QCD and explain why it dominates
over perturbative QCD when t > -few GeV^2.Comment: 20pp., 2 figures; v2: minor changes, to appear in JHE
On SUSY GUTs with a degenerate Higgs mass matrix

Certain supersymmetric grand unified models predict that the coefficients of
the quadratic terms in the MSSM Higgs potential should be degenerate at the GUT
scale. We discuss some examples for such models, and we analyse the
implications of this peculiar condition of a GUT-scale degenerate Higgs mass
matrix for low-scale MSSM phenomenology. To this end we explore the parameter
space which is consistent with existing experimental constraints by means of a
Markov Chain Monte Carlo analysis.Comment: 31 pages, 27 figures; v2: typos correcte
Supersymmetric top and bottom squark production at hadron colliders

The scalar partners of top and bottom quarks are expected to be the lightest
squarks in supersymmetric theories, with potentially large cross sections at
hadron colliders. We present predictions for the production of top and bottom
squarks at the Tevatron and the LHC, including next-to-leading order
corrections in supersymmetric QCD and the resummation of soft gluon emission at
next-to-leading-logarithmic accuracy. We discuss the impact of the higher-order
corrections on total cross sections and transverse-momentum distributions, and
provide an estimate of the theoretical uncertainty due to scale variation and
the parton distribution functions.Comment: 29 pages, 6 figure
Gauge Non-Singlet Inflation in SUSY GUTs

We explore the novel possibility that the inflaton responsible for
cosmological inflation is a gauge non-singlet in supersymmetric (SUSY) Grand
Unified Theories (GUTs). For definiteness we consider SUSY hybrid inflation
where we show that the scalar components of gauge non-singlet superfields,
together with fields in conjugate representations, may form a D-flat direction
suitable for inflation. We apply these ideas to SUSY models with an Abelian
gauge group, a Pati-Salam gauge group and finally Grand Unified Theories based
on SO(10) where the scalar components of the matter superfields in the
$\sixteen$s may combine with a single $\bar {sixteen}$ to form the inflaton,
with the right-handed sneutrino direction providing a possible viable
trajectory for inflation. Assuming sneutrino inflation, we calculate the
one-loop Coleman-Weinberg corrections and the two-loop corrections from gauge
interactions giving rise to the "gauge \eta-problem" and show that both
corrections do not spoil inflation, and the monopole problem can be resolved.
The usual \eta-problem arising from supergravity may also be resolved using a
Heisenberg symmetry.Comment: 41 pages, 6 figures; minor changes; version published in JHE
Non-perturbative renormalization of quark mass in Nf=2+1 QCD with the
  Schroedinger functional scheme

We present an evaluation of the quark mass renormalization factor for Nf=2+1
QCD. The Schroedinger functional scheme is employed as the intermediate scheme
to carry out non-perturbative running from the low energy region, where
renormalization of bare mass is performed on the lattice, to deep in the high
energy perturbative region, where the conversion to the renormalization group
invariant mass or the MS-bar scheme is safely carried out. For numerical
simulations we adopted the Iwasaki gauge action and non-perturbatively improved
Wilson fermion action with the clover term. Seven renormalization scales are
used to cover from low to high energy regions and three lattice spacings to
take the continuum limit at each scale. The regularization independent step
scaling function of the quark mass for the Nf=2+1 QCD is obtained in the
continuum limit. Renormalization factors for the pseudo scalar density and the
axial vector current are also evaluated for the same action and the bare
couplings as two recent large scale Nf=2+1 simulations; previous work of the
CP-PACS/JLQCD collaboration, which covered the up-down quark mass range heavier
than $m_\pi\sim 500$ MeV and that of PACS-CS collaboration for much lighter
quark masses down to $m_\pi=155$ MeV. The quark mass renormalization factor is
used to renormalize bare PCAC masses in these simulations.Comment: 26 pages, 17 Postscript figures. Two tables are update
BPS black holes in N=2 D=4 gauged supergravities

We construct and analyze BPS black hole solutions in gauged N=2, D=4
supergravity with charged hypermultiplets. A class of solutions can be found
through spontaneous symmetry breaking in vacua that preserve maximal
supersymmetry. The resulting black holes do not carry any hair for the scalars.
We demonstrate this with explicit examples of both asymptotically flat and
anti-de Sitter black holes. Next, we analyze the BPS conditions for
asymptotically flat black holes with scalar hair and spherical or axial
symmetry. We find solutions only in cases when the metric contains ripples and
the vector multiplet scalars become ghost-like. We give explicit examples that
can be analyzed numerically. Finally, we comment on a way to circumvent the
ghost-problem by introducing also fermionic hair.Comment: 40 pages, 2 figures; v2 references added; v3 minor changes, published
  versio
Light MSSM Higgs boson mass to three-loop accuracy

The light CP even Higgs boson mass, Mh, is calculated to three-loop accuracy
within the Minimal Supersymmetric Standard Model (MSSM). The result is
expressed in terms of DRbar parameters and implemented in the computer program
H3m. The calculation is based on the proper approximations and their
combination in various regions of the parameter space. The three-loop effects
to Mh are typically of the order of a few hundred MeV and opposite in sign to
the two-loop corrections. The remaining theory uncertainty due to higher order
perturbative corrections is estimated to be less than 1 GeV.Comment: 39 pages, 13 figures. v2: minor changes, typos fixe
Weyl Equation and (Non)-Commutative SU(n+1) BPS Monopoles

We apply the ADHMN construction to obtain the SU(n+1)(for generic values of
n) spherically symmetric BPS monopoles with minimal symmetry breaking. In
particular, the problem simplifies by solving the Weyl equation, leading to a
set of coupled equations, whose solutions are expressed in terms of the
Whittaker functions. Next, this construction is generalized for non-commutative
SU(n+1) BPS monopoles, where the corresponding solutions are given in terms of
the Heun B functions.Comment: 16 pages, Latex. Few typos corrected, version to appear in JHE