pinecone/core-2020-05-10-deduplication huggingface dataset:
Centre symmetric 3d effective actions for thermal SU(N) Yang-Mills from
  strong coupling series

We derive three-dimensional, Z(N)-symmetric effective actions in terms of
Polyakov loops by means of strong coupling expansions, starting from thermal
SU(N) Yang-Mills theory in four dimensions on the lattice. An earlier action in
the literature, corresponding to the (spatial) strong coupling limit, is thus
extended by several higher orders, as well as by additional interaction terms.
We provide analytic mappings between the couplings of the effective theory and
the parameters $N_\tau,\beta$ of the original thermal lattice theory, which can
be systematically improved. We then investigate the deconfinement transition
for the cases SU(2) and SU(3) by means of Monte Carlo simulations of the
effective theory. Our effective models correctly reproduce second order 3d
Ising and first order phase transitions, respectively. Furthermore, we
calculate the critical couplings $\beta_c(N_\tau)$ and find agreement with
results from simulations of the 4d theory at the few percent level for
$N_\tau=4-16$.Comment: 27 pages, 21 figures; final version published in JHEP; attached the
  corresponding Erratum (ref. JHEP 1107:014,2011, DOI 10.1007/JHEP07(2011)014)
  for ease of consultatio
New generalized nonspherical black hole solutions

We present numerical evidence for the existence of several types of static
black hole solutions with a nonspherical event horizon topology in $d\geq 6$
spacetime dimensions. These asymptotically flat configurations are found for a
specific metric ansatz and can be viewed as higher dimensional counterparts of
the $d=5$ static black rings, dirings and black Saturn. Similar to that case,
they are supported against collapse by conical singularities. The issue of
rotating generalizations of these solutions is also considered.Comment: 47 pages, 11 figures, some comments adde
CMB statistics in noncommutative inflation

Noncommutative geometry can provide effective description of physics at very
short distances taking into account generic effects of quantum gravity.
Inflation amplifies tiny quantum fluctuations in the early universe to
macroscopic scales and may thus imprint high energy physics signatures in the
cosmological perturbations that could be detected in the CMB. It is shown here
that this can give rise to parity-violating modulations of the primordial
spectrum and odd non-Gaussian signatures. The breaking of rotational invariance
of the CMB provides constraints on the scale of noncommutativity that are
competitive with the existing noncosmological bounds, and could explain the
curious hemispherical asymmetry that has been claimed to be observed in the
sky. This introduces also non-Gaussianity with peculiar shape- and
scale-dependence, which in principle allows an independent cross-check of the
presence of noncommutativity at inflation.Comment: 9 pages, no figure
Ultraviolet Completion of Flavour Models

Effective Flavour Models do not address questions related to the nature of
the fundamental renormalisable theory at high energies. We study the
ultraviolet completion of Flavour Models, which in general has the advantage of
improving the predictivity of the effective models. In order to illustrate the
important features we provide minimal completions for two known A4 models. We
discuss the phenomenological implications of the explicit completions, such as
lepton flavour violating contributions that arise through the exchange of
messenger fields.Comment: 18 pages, 8 figure
On form factors in N=4 sym

In this paper we study the form factors for the half-BPS operators
$\mathcal{O}^{(n)}_I$ and the $\mathcal{N}=4$ stress tensor supermultiplet
current $W^{AB}$ up to the second order of perturbation theory and for the
Konishi operator $\mathcal{K}$ at first order of perturbation theory in
$\mathcal{N}=4$ SYM theory at weak coupling. For all the objects we observe the
exponentiation of the IR divergences with two anomalous dimensions: the cusp
anomalous dimension and the collinear anomalous dimension. For the IR finite
parts we obtain a similar situation as for the gluon scattering amplitudes,
namely, apart from the case of $W^{AB}$ and $\mathcal{K}$ the finite part has
some remainder function which we calculate up to the second order. It involves
the generalized Goncharov polylogarithms of several variables. All the answers
are expressed through the integrals related to the dual conformal invariant
ones which might be a signal of integrable structure standing behind the form
factors.Comment: 35 pages, 7 figures, LATEX2
Fermions and D=11 Supergravity On Squashed Sasaki-Einstein Manifolds

We discuss the dimensional reduction of fermionic modes in a recently found
class of consistent truncations of D=11 supergravity compactified on squashed
seven-dimensional Sasaki-Einstein manifolds. Such reductions are of interest,
for example, in that they have $(2+1)$-dimensional holographic duals, and the
fermionic content and their interactions with charged scalars are an important
aspect of their applications. We derive the lower-dimensional equations of
motion for the fermions and exhibit their couplings to the various bosonic
modes present in the truncations under consideration, which most notably
include charged scalar and form fields. We demonstrate that our results are
consistent with the expected supersymmetric structure of the lower dimensional
theory, and apply them to a specific example which is relevant to the study of
$(2+1)$-dimensional holographic superconductors.Comment: 35 pages, PDFLaTeX; v2: added references, corrected typos, minor
  change
The Penrose Inequality and the Fluid/Gravity Correspondence

Motivated by the fluid/gravity correspondence, we consider the Penrose
inequality in the framework of fluid dynamics. In general relativity, the
Penrose inequality relates the mass and the entropy associated with a
gravitational background. If the inequality is violated by some Cauchy data, it
suggests a creation of a naked singularity, thus providing means to consider
the cosmic censorship hypothesis. The analogous inequality in the context of
fluid dynamics can provide a valuable tool in the study of finite-time blowups
in hydrodynamics. We derive the inequality for relativistic and nonrelativistic
fluid flows in general dimension. We show that the inequality is always
satisfied at the ideal fluid order. At the leading viscous order, the
inequality may be violated by relativistic fluid flows, while it is always
satisfied by nonrelativistic incompressible flows. The inequality may be
violated at the next to leading viscous order by both relativistic and
nonrelativistic flows.Comment: 18 pages, Revte
Proof of universality of electrical conductivity at finite chemical
  potential

It was proposed in arXiv:1008.2944 that, for certain gauge theories with
gravity duals, electrical conductivity at finite chemical potential is
universal. Here we provide a general proof that, when matter stress tensor
satisfies a compact constraint, electrical conductivity is universal. We
further elaborate our result with several conformal as well as non-conformal
gauge theories. We also discuss how boundary conductivity and universal
conductivity of stretched horizon are related.Comment: 23 pages, minor modification, Version published in JHE
On the gauge-algebra dependence of Landau-gauge Yang-Mills propagators

Yang-Mills theory can be formulated for any semi-simple Lie algebra, and thus
any semi-simple Lie group. In principle, the dynamics could be different for
each one. However, functional studies predict that the propagators in Landau
gauge depend only quantitatively on the gauge algebra. In particular, genuine
non-perturbative effects should be present even in the large N-limit for su(N)
gauge algebras.
  Lattice gauge theory is used to investigate this in detail. The propagators
are determined for the gauge groups SU(2), SU(3), SU(4), SU(5), SU(6) and G2,
in two and three dimensions. In accordance with the prediction no qualitative
dependence on the gauge group is found. In particular, no diminishing of
non-perturbative contributions is found for N becoming large in the SU(N) case.
Quantitative effects are found, and analyzed in detail.Comment: 33 pages, 14 figures, 4 tables; v2: minor changes, version to appear
  in JHE
From counting to construction of BPS states in N=4 SYM

We describe a universal element in the group algebra of symmetric groups,
whose characters provides the counting of quarter and eighth BPS states at weak
coupling in N=4 SYM, refined according to representations of the global
symmetry group. A related projector acting on the Hilbert space of the free
theory is used to construct the matrix of two-point functions of the states
annihilated by the one-loop dilatation operator, at finite N or in the large N
limit. The matrix is given simply in terms of Clebsch-Gordan coefficients of
symmetric groups and dimensions of U(N) representations. It is expected, by
non-renormalization theorems, to contain observables at strong coupling. Using
the stringy exclusion principle, we interpret a class of its eigenvalues and
eigenvectors in terms of giant gravitons. We also give a formula for the action
of the one-loop dilatation operator on the orthogonal basis of the free theory,
which is manifestly covariant under the global symmetry.Comment: 41 pages + Appendices, 4 figures; v2 - refs and acknowledgments adde
FCNC Processes from D-brane Instantons

Low string scale models might be tested at the LHC directly by their Regge
resonances. For such models it is important to investigate the constraints of
Standard Model precision measurements on the string scale. It is shown that
highly suppressed FCNC processes like K0- bar K^0 oscillations or leptonic
decays of the D0-meson provide non-negligible lower bounds on both the
perturbatively and surprisingly also non-perturbatively induced string theory
couplings. We present both the D-brane instanton formalism to compute such
amplitudes and discuss various possible scenarios and their constraints on the
string scale for (softly broken) supersymmetric intersecting D-brane models.Comment: 28 pages, 13 figures, reference added, 1 typo corrected, style file
  adde
Holography for chiral scale-invariant models

Deformation of any d-dimensional conformal field theory by a constant null
source for a vector operator of dimension (d + z -1) is exactly marginal with
respect to anisotropic scale invariance, of dynamical exponent z. The
holographic duals to such deformations are AdS plane waves, with z=2 being the
Schrodinger geometry. In this paper we explore holography for such chiral
scale-invariant models. The special case of z=0 can be realized with gravity
coupled to a scalar, and is of particular interest since it is related to a
Lifshitz theory with dynamical exponent two upon dimensional reduction. We show
however that the corresponding reduction of the dual field theory is along a
null circle, and thus the Lifshitz theory arises upon discrete light cone
quantization of an anisotropic scale invariant field theory.Comment: 62 pages; v2, published version, minor improvements and references
  adde
Complete off-shell effects in top quark pair hadroproduction with
  leptonic decay at next-to-leading order

Results for next-to-leading order QCD corrections to the pp(p\bar{p}) -> t
\bar{t} -> W^+W^- b\bar{b} -> e^{+} \nu_{e} \mu^{-} \bar{\nu}_{\mu} b \bar{b}
+X processes with complete off-shell effects are presented for the first time.
Double-, single- and non-resonant top contributions of the order
{\cal{O}}(\alpha_{s}^3 \alpha^4) are consistently taken into account, which
requires the introduction of a complex-mass scheme for unstable top quarks.
Moreover, the intermediate W bosons are treated off-shell. Comparison to the
narrow width approximation for top quarks, where non-factorizable corrections
are not accounted for is performed. Besides the total cross section and its
scale dependence, several differential distributions at the TeVatron run II and
the LHC are given. In case of the TeVatron the forward-backward asymmetry of
the top is recalculated afresh. With inclusive selection cuts, the
forward-backward asymmetry amounts to A^{t}_{FB} = 0.051 +/- 0.0013.
Furthermore, the corrections with respect to leading order are positive and of
the order 2.3% for the TeVatron and 47% for the LHC. A study of the scale
dependence of our NLO predictions indicates that the residual theoretical
uncertainty due to higher order corrections is 8% for the TeVatron and 9% for
the LHC.Comment: 35 pages, 39 figures, 3 tables. References and note added, version to
  appear in JHE
The Spectrum of FZZT Branes Beyond the Planar Limit

Minimal string theory has a number of FZZT brane boundary states; one for
each Cardy state of the minimal model. It was conjectured by Seiberg and Shih
that all branes in a minimal string theory could be expressed as a linear
combination of the brane associated to the identity operator of the minimal
model with complex shifts in the boundary cosmological constant. Subsequently
it was found that this identification of FZZT branes does not hold exactly for
some cylinder amplitudes but was spoiled by terms that are associated with
vanishing worldsheet area and are therefore non-universal. In this paper we
investigate this claim systematically, using both Liouville and matrix model
methods, beyond the planar limit. We find that the aforementioned
identification of FZZT branes is spoiled by terms that do not admit an
interpretation as non-universal terms. Furthermore, the spoiling terms as
computed using the matrix model are found to be in agreement with those coming
from Liouville theory, which also suggests that these terms have universal
meaning. Finally, we also investigate the identification of FZZT branes by
replacing the boundary state with a sum of local operators. We find in this
case that the brane associated with the identity operator appears to be special
as it is the only one to correctly reproduce the correlation numbers for bulk
operators on the torus.Comment: 30 pages; added references and reworked definitions on page
Three Roads to Probe-Brane Superconductivity

We study a defect system of two parallel D5 probe branes in a large-N_c D3
background. Using the non-abelian DBI action, we study three different fields
that can give rise to a superconducting phase transition: A vector (p-wave), a
scalar corresponding to a non-trivial "separation"' of the branes in the (3+1)
field theory directions and a scalar corresponding to a separation in the
"internal" S^5 (both s-wave).
  Comparing these phases first in the \alpha'^2 expansion, we find that the
internal scalar has the largest critical temperature and is always
thermodynamically preferred. Further, there is an interesting attractor
behavior.
  Taking a simplified version of the full DBI action that preserves its
regularity and geometry, we find that the divergences of the \alpha'^2
expansion are resolved and some second order transitions turn into first order
ones. In addition to some other changes of the phase diagram due to the
structure of the DBI action, we observe that the ground state degeneracy of the
unbroken theory is lifted. We also isolate the unphysical artifacts of our
simplification.Comment: 35 pages, 27 figures; fixed typos, added reference, minor structural
  changes and re-phrasings, final version to be published in JHE
Low-Energy Signals from Kinetic Mixing with a Warped Abelian Hidden
  Sector

We investigate the detailed phenomenology of a light Abelian hidden sector in
the Randall-Sundrum framework. Relative to other works with light hidden
sectors, the main new feature is a tower of hidden Kaluza-Klein vectors that
kinetically mix with the Standard Model photon and Z. We investigate the decay
properties of the hidden sector fields in some detail, and develop an approach
for calculating processes initiated on the ultraviolet brane of a warped space
with large injection momentum relative to the infrared scale. Using these
results, we determine the detailed bounds on the light warped hidden sector
from precision electroweak measurements and low-energy experiments. We find
viable regions of parameter space that lead to significant production rates for
several of the hidden Kaluza-Klein vectors in meson factories and fixed-target
experiments. This offers the possibility of exploring the structure of an extra
spacetime dimension with lower-energy probes.Comment: (1+32) Pages, 13 Figures. v2: JHEP version (minor modifications,
  results unchanged
Stabilizing the Complex Structure in Heterotic Calabi-Yau Vacua

In this paper, we show that the presence of gauge fields in heterotic
Calabi-Yau compacitifications causes the stabilisation of some, or all, of the
complex structure moduli of the Calabi-Yau manifold while maintaining a
Minkowski vacuum. Certain deformations of the Calabi-Yau complex structure,
with all other moduli held fixed, can lead to the gauge bundle becoming
non-holomorphic and, hence, non-supersymmetric. This leads to an F-term
potential which stabilizes the corresponding complex structure moduli. We use
10- and 4-dimensional field theory arguments as well as a derivation based
purely on algebraic geometry to show that this picture is indeed correct. An
explicit example is presented in which a large subset of complex structure
moduli is fixed. We demonstrate that this type of theory can serve as the
hidden sector in heterotic vacua and can co-exist with realistic particle
physics.Comment: 17 pages, Late
One Loop Renormalization of the Littlest Higgs Model

In Little Higgs models a collective symmetry prevents the Higgs from
acquiring a quadratically divergent mass at one loop. This collective symmetry
is broken by weakly gauged interactions. Terms, like Yukawa couplings, that
display collective symmetry in the bare Lagrangian are generically renormalized
into a sum of terms that do not respect the collective symmetry except possibly
at one renormalization point where the couplings are related so that the
symmetry is restored. We study here the one loop renormalization of a
prototypical example, the Littlest Higgs Model. Some features of the
renormalization of this model are novel, unfamiliar form similar chiral
Lagrangian studies.Comment: 23 pages, 17 eps figure
The   τ--contamination of the golden muon sample at the Neutrino Factory

16 páginas, 6 figuras.-- El Pdf del artículo es la versión pre-print: ArXiv ePrint: 1005.2275We study the contribution of ν e → ν τ → τ → μ transitions to the wrong-sign muon sample of the golden channel of the Neutrino Factory. Muons from tau decays are not really a background, since they contain information from the oscillation signal, and represent a small fraction of the sample. However, if not properly handled they introduce serious systematic error, in particular if the detector/analysis are sensitive to muons of low energy. This systematic effect is particularly troublesome for large θ 13 ≥ 1° and prevents the use of the Neutrino Factory as a precision facility for large θ 13. Such a systematic error disappears if the tau contribution to the golden muon sample is taken into account. The fact that the fluxes of the Neutrino Factory are exactly calculable permits the knowledge of the tau sample due to the ν e → ν τ oscillation. We then compute the contribution to the muon sample arising from this sample in terms of the apparent muon energy. This requires the computation of a migration matrix M ij which describes the contributions of the tau neutrinos of a given energy E i , to the muon neutrinos of an apparent energy E j . We demonstrate that applying M ij to the data permits the full correction of the otherwise intolerable systematic error.This work was supported by the European Union under\ud
the European Commission Framework Programme 07 Design Study ”EUROv”, project\ud
212372 and by the spanish ministry for Science and Innovation under the program “CUP”\ud
Consolider-Ingenio 2010, project CSD2008-0037. A.D. acknowledges funding by the spanish\ud
ministry for Science and Innovation under the project FPA2009-09017and by the Comunidad\ud
Autónoma de Madrid through project HEPHACOS-CM (S2009ESP-1473). D.M.\ud
was supported by the Deutsche Forschungs-gemeinschaft, contract WI 2639/2-1.Peer reviewe
Quark and lepton mixing angles with a dodeca-symmetry

The discrete symmetry D_12 at the electroweak scale is used to fix the quark
and lepton mixing angles. At the leading order, the Cabbibo angle theta_C is
15^o, and the PMNS matrix is of a bi-dodeca-mixing form giving the
Solar-neutrino angle theta_sol=30^o. Thus, there results the relation
theta_sol+theta_C ~ 45^o. Out of discrete vacua, a certain vacuum is chosen for
this assignment to be consistent with the dodeca-symmetry. A shift of theta_C
from 15^o to 13.14^o might arise from a small breaking of the dodeca-symmetry.
The spontaneous breaking leading to the required electroweak vacuum is made
possible by introducing an additional parity in an effective field approach or
by realizing the electroweak dodeca-symmetry explicitly at a high energy scale.
At the vacuum we chose Arg.Det.M_q is nonzero, and hence a solution of the
strong CP problem invites a very light axion at a high energy scale. We also
comment how the next level corrections can fit the mixing angles to the
observed values.Comment: 15 pages, 2 figure
Factorization and resummation of s-channel single top quark production

In this paper we study the factorization and resummation of s-channel single
top quark production in the Standard Model at both the Tevatron and the LHC. We
show that the production cross section in the threshold limit can be factorized
into a convolution of hard function, soft function and jet function via
soft-collinear-effective-theory (SCET), and resummation can be performed using
renormalization group equation in the momentum space resummation formalism. We
find that in general, the resummation effects enhance the Next-to-Leading-Order
(NLO) cross sections by about $3%-5%$ at both the Tevatron and the LHC, and
significantly reduce the factorization scale dependence of the total cross
section at the Tevatron, while at the LHC we find that the factorization scale
dependence has not been improved, compared with the NLO results.Comment: 29 pages, 7 figures; version published in JHE
Dark matter and a new gauge boson through kinetic mixing

We consider a hidden sector model of dark matter which is charged under a
hidden U(1)_X gauge symmetry. Kinetic mixing of U(1)_X with the Standard Model
hypercharge U(1)_Y is allowed to provide communication between the hidden
sector and the Standard Model sector. We present various limits on the kinetic
mixing parameter and the hidden gauge coupling constant coming from various low
energy observables, electroweak precision tests, and the right thermal relic
density of the dark matter. Saturating these constraints, we show that the
spin-independent elastic cross section of the dark matter off nucleons is
mostly below the current experimental limits, but within the future
sensitivity. Finally, we analyze the prospect of observing the hidden gauge
boson through its dimuon decay channel at hadron colliders.Comment: 21 pages, 9 figures, references adde
Analytic Epsilon Expansions of Master Integrals Corresponding to
  Massless Three-Loop Form Factors and Three-Loop g-2 up to Four-Loop
  Transcendentality Weight

We evaluate analytically higher terms of the epsilon-expansion of the
three-loop master integrals corresponding to three-loop quark and gluon form
factors and to the three-loop master integrals contributing to the electron g-2
in QED up to the transcendentality weight typical to four-loop calculations,
i.e. eight and seven, respectively. The calculation is based on a combination
of a method recently suggested by one of the authors (R.L.) with other
techniques: sector decomposition implemented in FIESTA, the method of
Mellin--Barnes representation, and the PSLQ algorithm.Comment: 28 pages,4 figure