pinecone/core-2020-05-10-deduplication huggingface dataset:
Non-standard primordial fluctuations and nongaussianity in string
  inflation

Inflationary scenarios in string theory often involve a large number of light
scalar fields, whose presence can enrich the post-inflationary evolution of
primordial fluctuations generated during the inflationary epoch. We provide a
simple example of such post-inflationary processing within an explicit
string-inflationary construction, using a Kahler modulus as the inflaton within
the framework of LARGE Volume Type-IIB string flux compactifications. We argue
that inflationary models within this broad category often have a selection of
scalars that are light enough to be cosmologically relevant, whose
contributions to the primordial fluctuation spectrum can compete with those
generated in the standard way by the inflaton. These models consequently often
predict nongaussianity at a level, f_NL ~ O(10), potentially observable by the
Planck satellite, with a bi-spectrum maximized by triangles with squeezed shape
in a string realisation of the curvaton scenario. We argue that the observation
of such a signal would robustly prefer string cosmologies such as these that
predict a multi-field dynamics during the very early universe.Comment: 31 pages. Typos corrected, references added, matches published
  version. Dedicated to Lev Kofma
Thermodynamic instability of doubly spinning black objects

We investigate the thermodynamic stability of neutral black objects with (at
least) two angular momenta. We use the quasilocal formalism to compute the
grand canonical potential and show that the doubly spinning black ring is
thermodynamically unstable. We consider the thermodynamic instabilities of
ultra-spinning black objects and point out a subtle relation between the
microcanonical and grand canonical ensembles. We also find the location of the
black string/membrane phases of doubly spinning black objects.Comment: 25 pages, 7 figures v2: matches the published versio
Next-to-leading order QCD effects and the top quark mass measurements at
  the LHC

It is anticipated that a number of techniques to measure the top quark mass
at the LHC will yield m_top with uncertainties of about 0.5-1 percent. These
uncertainties are mostly theoretical; they are usually estimated using parton
shower Monte Carlo programs whose reliability at this level of precision is
difficult to assess. The goal of this paper is to contrast those estimates with
the results of NLO QCD computations for a few observables, often discussed in
the context of high-precision top quark mass measurements at the LHC. In
particular, we study the NLO QCD corrections to the invariant mass distribution
of a charged lepton and a B-meson in lepton+jets channels. In the dilepton
channel we investigate the invariant mass distribution of a charged lepton and
a b-jet, the average energy of the two leptons and the average energy of the
b-jets from top decays.Comment: 18 pages, 8 figures, 3 table
Quantum corrections and black hole spectroscopy

In the work \cite{BRM,RBE}, black hole spectroscopy has been successfully
reproduced in the tunneling picture. As a result, the derived entropy spectrum
of black hole in different gravity (including Einstein's gravity,
Einstein-Gauss-Bonnet gravity and Ho\v{r}ava-Lifshitz gravity) are all evenly
spaced, sharing the same forms as $S_n=n$, where physical process is only
confined in the semiclassical framework. However, the real physical picture
should go beyond the semiclassical approximation. In this case, the physical
quantities would undergo higher-order quantum corrections, whose effect on
different gravity shares in different forms. Motivated by these facts, in this
paper we aim to observe how quantum corrections affect black hole spectroscopy
in different gravity. The result shows that, in the presence of higher-order
quantum corrections, black hole spectroscopy in different gravity still shares
the same form as $S_n=n$, further confirming the entropy quantum is universal
in the sense that it is not only independent of black hole parameters, but also
independent of higher-order quantum corrections. This is a desiring result for
the forthcoming quantum gravity theory.Comment: 14 pages, no figure, use JHEP3.cls. to be published in JHE
Chern-Simons black holes: scalar perturbations, mass and area spectrum
  and greybody factors

We study the Chern-Simons black holes in d-dimensions and we calculate
analytically the quasi-normal modes of the scalar perturbations and we show
that they depend on the highest power of curvature present in the Chern-Simons
theory. We obtain the mass and area spectrum of these black holes and we show
that they have a strong dependence on the topology of the transverse space and
they are not evenly spaced. We also calculate analytically the reflection and
transmission coefficients and the absorption cross section and we show that at
low frequency limit there is a range of modes which contributes to the
absorption cross section.Comment: 19 pages, 18 figures, the title has been changed to reflect the
  addition of an another section on the reflection, transmission coefficients
  and absorption cross sections of the Chern-Simons black holes. Version to be
  published in JHE
Deciphering Universal Extra Dimension from the top quark signals at the
  CERN LHC

Models based on Universal Extra Dimensions predict Kaluza-Klein (KK)
excitations of all Standard Model (SM) particles. We examine the pair
production of KK excitations of top- and bottom-quarks at the Large Hadron
Collider. Once produced, the KK top/bottom quarks can decay to $b$-quarks,
leptons and the lightest KK-particle, $\gamma_1$, resulting in 2 $b$-jets, two
opposite sign leptons and missing transverse momentum, thereby mimicing
top-pair production. We show that, with a proper choice of kinematic cuts, an
integrated luminosity of 100 fb$^{-1}$ would allow a discovery for an inverse
radius upto $R^{-1} = 750$ GeV.Comment: 18 pages, 14 figures, Accepted for publication in JHE
Beautiful Mirrors at the LHC

We explore the "Beautiful Mirrors" model, which aims to explain the measured
value of $A^b_{FB}$, discrepant at the $2.9\sigma$ level. This scenario
introduces vector-like quarks which mix with the bottom, subtly affecting its
coupling to the $Z$. The spectrum of the new particles consists of two
bottom-like quarks and a charge -4/3 quark, all of which have electroweak
interactions with the third generation. We explore the phenomenology and
discovery reach for these new particles at the LHC, exploring single mirror
quark production modes whose rates are proportional to the same mixing
parameters which resolve the $A_{FB}^b$ anomaly. We find that for mirror quark
masses $\lesssim 500 GeV, a 14 TeV LHC with 300 {\rm fb}^{-1}$ is required to
reasonably establish the scenario and extract the relevant mixing parameters.Comment: version to be published in JHE
On the reflection of magnon bound states

We investigate the reflection of two-particle bound states of a free open
string in the light-cone AdS_5 x S^5 string sigma model, for large angular
momentum J=J_56 and ending on a D7 brane which wraps the entire AdS_5 and a
maximal S^3 of S^5. We use the superspace formalism to analyse fundamental and
two-particle bound states in the cases of supersymmetry-preserving and
broken-supersymmetry boundaries. We find the boundary S-matrices corresponding
to bound states both in the bulk and on the boundary.Comment: 35 pages, v2: few typos and ref corrected, accepted for publication
  in JHE
Geometric entropy and third order phase transition in d=4 N=2 SYM with
  flavor

We analyze the phase structure of $d=4$ $\mathcal{N}=2$ large $N$ SYM theory
with flavor on $S^1\times S^3$ by using geometric entropy as an order
parameter. We introduce chemical potential conjugate to global U(1) symmetry
and find the third order phase transition at finite density by using the
geometric entropy as the order parameter. We also find that the geometric
entropy at the finite density has an interesting behavior at low temperature
and for large $N_f$.Comment: 21 pages, 12 figures; minor changes, a reference adde
On semiclassical approximation for correlators of closed string vertex
  operators in AdS/CFT

We consider the 2-point function of string vertex operators representing
string state with large spin in AdS_5. We compute this correlator in the
semiclassical approximation and show that it has the expected (on the basis of
state-operator correspondence) form of the strong-coupling limit of the 2-point
function of single trace minimal twist operators in gauge theory. The
semiclassical solution representing the stationary point of the path integral
with two vertex operator insertions is found to be related to the large spin
limit of the folded spinning string solution by a euclidean continuation,
transformation to Poincare coordinates and conformal map from cylinder to
complex plane. The role of the source terms coming from the vertex operator
insertions is to specify the parameters of the solution in terms of quantum
numbers (dimension and spin) of the corresponding string state. Understanding
further how similar semiclassical methods may work for 3-point functions may
shed light on strong-coupling limit of the corresponding correlators in gauge
theory as was recently suggested by Janik et al in arXiv:1002.4613.Comment: 19 pages, 1 figure; minor corrections, references added, footnote
  below eq. (4.5) adde
Prospects and Constraints for Vector-like MFV Matter at LHC

We examine the prospects for LHC discovery of SU(2)_L singlet vector-like
quarks that obey Minimal Flavour Violation (MFV) and are consistent with lower
energy phenomenology. We study models where the vector-like quarks have the
same quantum numbers as u_R or d_R, allowing mixing, which generally leads to
significant low energy constraints. We find that there are two naturally
phenomenologically viable MFV models of this type when the Weyl spinor
components of the vector-like quarks are flavour triplets. We examine direct
production bounds, flavour and electroweak precision data constraints for these
models and determine the cross section for allowed values of the model
parameters at LHC. For the models we identify as naturally phenomenologically
viable, large amounts of parameter space afford a significant early discovery
reach at LHC while being consistent with lower energy phenomenology.Comment: 26 pages, 4 figures; v2: published in JHE
Generalized Calabi-Yau metric and Generalized Monge-Ampere equation

In the neighborhood of a regular point, generalized Kahler geometry admits a
description in terms of a single real function, the generalized Kahler
potential. We study the local conditions for a generalized Kahler manifold to
be a generalized Calabi-Yau manifold and we derive a non-linear PDE that the
generalized Kahler potential has to satisfy for this to be true. This
non-linear PDE can be understood as a generalization of the complex
Monge-Ampere equation and its solutions give supergravity solutions with
metric, dilaton and H-field.Comment: 26 page
Semi-analytic results for quasi-normal frequencies

The last decade has seen considerable interest in the quasi-normal
frequencies [QNFs] of black holes (and even wormholes), both asymptotically
flat and with cosmological horizons. There is wide agreement that the QNFs are
often of the form omega_n = (offset) + i n (gap), though some authors have
encountered situations where this behaviour seems to fail. To get a better
understanding of the general situation we consider a semi-analytic model based
on a piecewise Eckart (Poeschl-Teller) potential, allowing for different
heights and different rates of exponential falloff in the two asymptotic
directions. This model is sufficiently general to capture and display key
features of the black hole QNFs while simultaneously being analytically
tractable, at least for asymptotically large imaginary parts of the QNFs. We
shall derive an appropriate "quantization condition" for the asymptotic QNFs,
and extract as much analytic information as possible. In particular, we shall
explicitly verify that the (offset)+ i n (gap) behaviour is common but not
universal, with this behaviour failing unless the ratio of rates of exponential
falloff on the two sides of the potential is a rational number. (This is
"common but not universal" in the sense that the rational numbers are dense in
the reals.) We argue that this behaviour is likely to persist for black holes
with cosmological horizons.Comment: V1: 28 pages, no figures. V2: 3 references added, no physics changes.
  V3: 29 pages, 9 references added, no physics changes; V4: reformatted, now 27
  pages. Some clarifications, comparison with results obtained by monodromy
  techniques. This version accepted for publication in JHEP. V5: Minor typos
  fixed. Compatible with published versio
A Comprehensive Analysis of Electric Dipole Moment Constraints on
  CP-violating Phases in the MSSM

We analyze the constraints placed on individual, flavor diagonal CP-violating
phases in the minimal supersymmetric extension of the Standard Model (MSSM) by
current experimental bounds on the electric dipole moments (EDMs) of the
neutron, Thallium, and Mercury atoms. We identify the four CP-violating phases
that are individually highly constrained by current EDM bounds, and we explore
how these phases and correlations among them are constrained by current EDM
limits. We also analyze the prospective implications of the next generation of
EDM experiments. We point out that all other CP-violating phases in the MSSM
are not nearly as tightly constrained by limits on the size of EDMs. We
emphasize that a rich set of phenomenological consequences is potentially
associated with these generically large EDM-allowed phases, ranging from B
physics, electroweak baryogenesis, and signals of CP-violation at the CERN
Large Hadron Collider and at future linear colliders. Our numerical study takes
into account the complete set of contributions from one- and two-loop EDMs of
the electron and quarks, one- and two-loop Chromo-EDMs of quarks, the Weinberg
3-gluon operator, and dominant 4-fermion CP-odd operator contributions,
including contributions which are both included and not included yet in the
CPsuperH2.0 package. We also introduce an open-source numerical package, 2LEDM,
which provides the complete set of two-loop electroweak diagrams contributing
to the electric dipole moments of leptons and quarks.Comment: 23 pages, 11 figures; v2: references added, minor change
Flux tube delocalization at the deconfinement point

We study the behaviour of the flux tube thickness in the vicinity of the
deconfinement transition. We show, using effective string methods, that in this
regime the square width increases linearly and not logarithmically with the
interquark distance. The amplitude of this linear growth is an increasing
function of the temperature and diverges as the deconfinement transition is
approached from below. These predictions are in good agreement with a set of
simulations performed in the 3d gauge Ising model.Comment: 16 pages, 1 figure. Revised version, with an improved discussion of
  the dimensional reduction approach. Accepted for publication in JHE
Non-global logarithms and jet algorithms in high-pT jet shapes

We consider jet-shape observables of the type proposed recently, where the
shapes of one or more high-pT jets, produced in a multi-jet event with definite
jet multiplicity, may be measured leaving other jets in the event unmeasured.
We point out the structure of the full next-to-leading logarithmic resummation
specifically including resummation of non-global logarithms in the leading-Nc
limit and emphasising their properties. We also point out differences between
jet algorithms in the context of soft gluon resummation for such observables.Comment: 22 pages, 4 figures. Title and a few words changed. Several typos
  corrected. Version accepted by JHE
On Holographic description of the Kerr-Newman-AdS-dS black holes

In this paper, we study the holographic description of the generic
four-dimensional non-extremal Kerr-Newman-AdS-dS black holes. We find that if
focusing on the near-horizon region, for the massless scalar scattering in the
low-frequency limit, there exists hidden conformal symmetry on the solution
space. Similar to the Kerr case, this suggests that the Kerr-Newman-AdS-dS
black hole is dual to a two-dimensional CFT with central charges
$c_L=c_R=\frac{6a(r_++r_\ast)}{k}$ and temperatures
$T_L=\frac{k(r_+^2+r_\ast^2+2a^2)}{4\pi a\Xi(r_++r_\ast)},
T_R=\frac{k(r_+-r_\ast)}{4\pi a\Xi}$. The macroscopic Bekenstein-Hawking
entropy could be recovered from the microscopic counting in dual CFT via the
Cardy formula. Using the Minkowski prescription, we compute the real-time
correlators of the scalar, photon and graviton in near horizon geometry of near
extremal Kerr-AdS-dS black hole. In all these cases, the retarded Green's
function and the corresponding absorption cross section are in perfect match
with CFT prediction. We further discuss the low-frequency scattering of a
charged scalar by a Kerr-Newman-AdS-dS black hole and find the dual CFT
description.Comment: 22 pages; minor corrections, conlusion unchanged, references
  added;published versio
The matrix model version of AGT conjecture and CIV-DV prepotential

Recently exact formulas were provided for partition function of conformal
(multi-Penner) beta-ensemble in the Dijkgraaf-Vafa phase, which, if interpreted
as Dotsenko-Fateev correlator of screenings and analytically continued in the
number of screening insertions, represents generic Virasoro conformal blocks.
Actually these formulas describe the lowest terms of the q_a-expansion, where
q_a parameterize the shape of the Penner potential, and are exact in the
filling numbers N_a. At the same time, the older theory of CIV-DV prepotential,
straightforwardly extended to arbitrary beta and to non-polynomial potentials,
provides an alternative expansion: in powers of N_a and exact in q_a. We check
that the two expansions coincide in the overlapping region, i.e. for the lowest
terms of expansions in both q_a and N_a. This coincidence is somewhat
non-trivial, since the two methods use different integration contours:
integrals in one case are of the B-function (Euler-Selberg) type, while in the
other case they are Gaussian integrals.Comment: 27 pages, 1 figur
Black Holes in Quasi-topological Gravity

We construct a new gravitational action which includes cubic curvature
interactions and which provides a useful toy model for the holographic study of
a three parameter family of four- and higher-dimensional CFT's. We also
investigate the black hole solutions of this new gravity theory. Further we
examine the equations of motion of quasi-topological gravity. While the full
equations in a general background are fourth-order in derivatives, we show that
the linearized equations describing gravitons propagating in the AdS vacua
match precisely the second-order equations of Einstein gravity.Comment: 33 pages, 4 figures; two references adde
Non-perturbative renormalization of quark bilinear operators with Nf=2
  (tmQCD) Wilson fermions and the tree-level improved gauge action

We present results for the renormalization constants of bilinear quark
operators obtained by using the tree-level Symanzik improved gauge action and
the Nf=2 twisted mass fermion action at maximal twist, which guarantees
automatic O(a)-improvement. Our results are also relevant for the corresponding
standard (un-twisted) Wilson fermionic action since the two actions only
differ, in the massless limit, by a chiral rotation of the quark fields. The
scale-independent renormalization constants ZV, ZA and the ratio ZP/ZS have
been computed using the RI-MOM approach, as well as other alternative methods.
For ZA and ZP/ZS, the latter are based on both standard twisted mass and
Osterwalder-Seiler fermions, while for ZV a Ward Identity has been used. The
quark field renormalization constant Zq and the scale dependent renormalization
constants ZS, ZP and ZT are determined in the RI-MOM scheme. Leading
discretization effects of O(g^2 a^2), evaluated in one-loop perturbation
theory, are explicitly subtracted from the RI-MOM estimates.Comment: 31 pages, 11 figure
Warped black holes in 3D general massive gravity

We study regular spacelike warped black holes in the three dimensional
general massive gravity model, which contains both the gravitational
Chern-Simons term and the linear combination of curvature squared terms
characterizing the new massive gravity besides the Einstein-Hilbert term. The
parameters of the metric are found by solving a quartic equation constrained by
an inequality that imposes the absence of closed timelike curves. Explicit
expressions for the central charges are suggested by exploiting the fact that
these black holes are discrete quotients of spacelike warped AdS(3) and a known
formula for the entropy. Previous results obtained separately in topological
massive gravity and in new massive gravity are recovered as special cases.Comment: 38 pages, 7 figures. v2: minor changes, added refs and an appendix on
  self-dual and null z-warped black hole
Properties and uses of the Wilson flow in lattice QCD

Theoretical and numerical studies of the Wilson flow in lattice QCD suggest
that the gauge field obtained at flow time t>0 is a smooth renormalized field.
The expectation values of local gauge-invariant expressions in this field are
thus well-defined physical quantities that probe the theory at length scales on
the order of sqrt(t). Moreover, by transforming the QCD functional integral to
an integral over the gauge field at a specified flow time, the emergence of the
topological (instanton) sectors in the continuum limit becomes transparent and
is seen to be caused by a dynamical effect that rapidly separates the sectors
when the lattice spacing is reduced from 0.1 fm to smaller values.Comment: Plain TeX source, 21 pages, 4 figures. Corrected figure 2, figure 3
  and the quoted values of t0/a^2 in table 1, following the discovery of a bug
  in the analysis programs (thanks to Yoshifumi Nakamura
Extremal solutions of the S3 model and nilpotent orbits of G2(2)

We study extremal black hole solutions of the S3 model (obtained by setting
S=T=U in the STU model) using group theoretical methods. Upon dimensional
reduction over time, the S3 model exhibits the pseudo-Riemannian coset
structure G/K with G=G2(2) and K=SO(2,2). We study nilpotent K-orbits of G2(2)
corresponding to non-rotating single-center extremal solutions. We find six
such distinct K-orbits. Three of these orbits are supersymmetric, one is
non-supersymmetric, and two are unphysical. We write general solutions and
discuss examples in all four physical orbits. We show that all solutions in
supersymmetric orbits when uplifted to five-dimensional minimal supergravity
have single-center Gibbons-Hawking space as their four-dimensional Euclidean
hyper-K\"ahler base space. We construct hitherto unknown extremal
(supersymmetric as well as non-supersymmetric) pressureless black strings of
minimal five-dimensional supergravity and briefly discuss their relation to
black rings.Comment: 45 pages, 2 figures. v2: minor changes. Published versio