pinecone/core-2020-05-10-deduplication huggingface dataset:
Three-mass triangle integrals and single-valued polylogarithms

We study one and two-loop triangle integrals with massless propagators and
all external legs off shell. We show that there is a kinematic region where the
results can be expressed in terms of a basis of single-valued polylogarithms in
one complex variable. The relevant space of single-valued functions can be
determined a priori and the results take strikingly a simple and compact form
when written in terms of this basis. We study the properties of the basis
functions and illustrate how one can easily analytically continue our results
to all kinematic regions where the external masses have the same sign.Comment: 31 pages, 2 figure
The TeV Dawn of SUSY Models - Consequences for Flavour and CP

Direct searches and the hints for the Higgs at ~125 GeV put increasing
pressure on simple models of SUSY breaking, in particular (but not exclusively)
on those that automatically solve the flavour problem, such as gauge mediation.
SUSY-breaking parameters are pushed to higher and higher values, increasing the
fine-tuning required to achieve electroweak symmetry breaking at the observed
scale. In this note we consider the situation for models which do not attempt
to solve the flavour problem. To treat them on equal footing, we consider the
combined fine-tuning arising from electroweak symmetry breaking as well as from
fulfilling flavour constraints. We also consider CP. We find that for an
anarchic flavour (and CP) structure of the soft SUSY breaking terms, the
minimum in the fine-tuning occurs at a scale of a few TeV. This is consistent
with the current experimental situation and leads to motivating conclusions for
direct searches as well as future flavour and CP measurements.Comment: 11 pages, 6 figures v2 updated versio
Vacuum structure and stability of a singlet fermion dark matter model
  with a singlet scalar messenger

We consider the issue of vacuum stability and triviality bound of the singlet
extension of the Standard Model (SM) with a singlet fermion dark matter (DM).
In this model, the singlet scalar plays the role of a messenger between the SM
sector and the dark matter sector. This model has two Higgs-like scalar bosons,
and is consistent with all the data on electroweak precision tests, thermal
relic density of DM and its direct detection constraints. We show that this
model is stable without hitting Landau pole up to Planck scale for 125 GeV
Higgs boson. We also perform a comprehensive study of vacuum structure, and
point out that a region where electroweak vacuum is the global minimum is
highly limited. In this model, both Higgs-like scalar bosons have reduced
couplings to the SM weak gauge bosons and the SM fermions, because of the
mixing between the SM Higgs boson and the singlet scalar. There is also a
possibility of their invisible decay(s) into a pair of DM's. Therefore this
model would be disfavored if the future data on the $(\sigma \cdot B)_{VV}$ or
$(\sigma \cdot B)_{f\bar{f}}$ with $V=\gamma,W,Z$ and $f=b, \tau$ turn out
larger than the SM predictions.Comment: 41 pages, 31 figures; v2: references added; v3: new figure added,
  version to appear in JHE
Quiver Structure of Heterotic Moduli

We analyse the vector bundle moduli arising from generic heterotic
compactifications from the point of view of quiver representations. Phenomena
such as stability walls, crossing between chambers of supersymmetry, splitting
of non-Abelian bundles and dynamic generation of D-terms are succinctly encoded
into finite quivers. By studying the Poincar\'e polynomial of the quiver moduli
space using the Reineke formula, we can learn about such useful concepts as
Donaldson-Thomas invariants, instanton transitions and supersymmetry breaking.Comment: 38 pages, 5 figures, 1 tabl
Relating harmonic and projective descriptions of N=2 nonlinear sigma
  models

Recent papers have established the relationship between projective superspace
and a complexified version of harmonic superspace. We extend this construction
to the case of general nonlinear sigma models in both frameworks. Using an
analogy with Hamiltonian mechanics, we demonstrate how the Hamiltonian
structure of the harmonic action and the symplectic structure of the projective
action naturally arise from a single unifying action on a complexified version
of harmonic superspace. This links the harmonic and projective descriptions of
hyperkahler target spaces. For the two examples of Taub-NUT and Eguchi-Hanson,
we show how to derive the projective superspace solutions from the harmonic
superspace solutions.Comment: 25 pages; v3: typo fixed in eq (1.36
Holographic Fluids with Vorticity and Analogue Gravity

We study holographic three-dimensional fluids with vorticity in local
equilibrium and discuss their relevance to analogue gravity systems. The
Fefferman-Graham expansion leads to the fluid's description in terms of a
comoving and rotating Papapetrou-Randers frame. A suitable Lorentz
transformation brings the fluid to the non-inertial Zermelo frame, which
clarifies its interpretation as moving media for light/sound propagation. We
apply our general results to the Lorentzian Kerr-AdS_4 and Taub-NUT-AdS_4
geometries that describe fluids in cyclonic and vortex flows respectively. In
the latter case we associate the appearance of closed timelike curves to
analogue optical horizons. In addition, we derive the classical rotational Hall
viscosity of three-dimensional fluids with vorticity. Our formula remarkably
resembles the corresponding result in magnetized plasmas
Dark Radiation and Dark Matter in Large Volume Compactifications

We argue that dark radiation is naturally generated from the decay of the
overall volume modulus in the LARGE volume scenario. We consider both
sequestered and non-sequestered cases, and find that the axionic superpartner
of the modulus is produced by the modulus decay and it can account for the dark
radiation suggested by observations, while the modulus decay through the
Giudice-Masiero term gives the dominant contribution to the total decay rate.
In the sequestered case, the lightest supersymmetric particles produced by the
modulus decay can naturally account for the observed dark matter density. In
the non-sequestered case, on the other hand, the supersymmetric particles are
not produced by the modulus decay, since the soft masses are of order the heavy
gravitino mass. The QCD axion will then be a plausible dark matter candidate.Comment: 27 pages, 4 figures; version 3: version published in JHE
NNLL Resummation for Jet Broadening

The resummation for the event-shape variable jet broadening is extended to
next-to-next-to-leading logarithmic accuracy by computing the relevant jet and
soft functions at one-loop order and the collinear anomaly to two-loop
accuracy. The anomaly coefficient is extracted from the soft function and
expressed in terms of polylogarithmic as well as elliptic functions. With our
results, the uncertainty on jet-broadening distributions is reduced
significantly, which should allow for a precise determination of the strong
coupling constant from the existing experimental data and provide a consistency
check on the extraction of alpha_s from higher-log resummations of thrust.Comment: 44 pages, 9 figure
Comparison of neutralino and sneutrino dark matter in a model with
  spontaneous CP violation

Supersymmetric extensions to the standard model provide viable dark matter
candidates, and can introduce additional charge-parity (CP) violation, needed
for obtaining the observed baryon asymmetry of the universe. We study the
possibilities of scalar and neutralino dark matter with spontaneous CP
violation in the next-to-minimal supersymmetric standard model with a right
handed neutrino. The observed relic density can be produced both by neutralino
and right handed sneutrino as the lightest supersymmetric particle, but when CP
is violated, the new annihilation channels lower the achieved relic density in
general. We consider collider phenomenology in a number of benchmark points, in
which all experimental constraints are satisfied, and either the neutralino or
the right handed sneutrino contribute to the dark matter abundance.Comment: v2: corrected spelling, edited for clarity, added description of
  experimental bound, added local report numbe
Fixed-Functionals of three-dimensional Quantum Einstein Gravity

We study the non-perturbative renormalization group flow of f(R)-gravity in
three-dimensional Asymptotically Safe Quantum Einstein Gravity. Within the
conformally reduced approximation, we derive an exact partial differential
equation governing the RG-scale dependence of the function f(R). This equation
is shown to possess two isolated and one continuous one-parameter family of
scale-independent, regular solutions which constitute the natural
generalization of RG fixed points to the realm of infinite-dimensional theory
spaces. All solutions are bounded from below and give rise to positive definite
kinetic terms. Moreover, they admit either one or two UV-relevant deformations,
indicating that the corresponding UV-critical hypersurfaces remain finite
dimensional despite the inclusion of an infinite number of coupling constants.
The impact of our findings on the gravitational Asymptotic Safety program and
its connection to new massive gravity is briefly discussed.Comment: 34 pages, 14 figure
A Fast Track towards the `Higgs' Spin and Parity

The LHC experiments ATLAS and CMS have discovered a new boson that resembles
the long-sought Higgs boson: it cannot have spin one, and has couplings to
other particles that increase with their masses, but the spin and parity remain
to be determined. We show here that the `Higgs' + gauge boson invariant-mass
distribution in `Higgs'-strahlung events at the Tevatron or the LHC would be
very different under the J^P = 0+, 0- and 2+ hypotheses, and could provide a
fast-track indicator of the `Higgs' spin and parity. Our analysis is based on
simulations of the experimental event selections and cuts using PYTHIA and
Delphes, and incorporates statistical samples of `toy' experiments.Comment: 18 pages, 9 pdf figure
Thermodynamics of higher spin black holes in 3D

We examine the thermodynamic properties of recently constructed black hole
solutions in SL(3,R) x SL(3,R) Chern-Simons theory in the presence of a
chemical potential for spin-3 charge, which acts as an irrelevant deformation
of the dual CFT with W_3 x W_3 symmetry. The smoothness or holonomy conditions
admit four branches of solutions describing a flow between two AdS_3
backgrounds corresponding to two different CFTs. The dominant branch at low
temperatures, connected to the BTZ black hole, merges smoothly with a
thermodynamically unstable branch and disappears at higher temperatures. We
confirm that the UV region of the flow satisfies the Ward identities of a CFT
with W_3^(2) x W_3^(2) symmetry deformed by a spin-3/2 current. This allows to
identify the precise map between UV and IR thermodynamic variables. We find
that the high temperature regime is dominated by a black hole branch whose
thermodynamics can only be consistently inferred with reference to this W_3^(2)
x W_3^(2) CFT.Comment: 29 pages, 2 figure
Hyperscaling violation for scalar black branes in arbitrary dimensions

We extend to black branes (BB) in arbitrary dimensions the results of Ref.
[1] about hyperscaling violation and phase transition for scalar black
2-branes. We derive the analytic form of the (d+1)-dimensional scalar soliton
interpolating between a conformal invariant AdS vacuum in the infrared and a
scale covariant metric in the ultraviolet. We show that the thermodynamical
system undergoes a phase transition between Schwarzschild-AdS and a
scalar-dressed BB. We calculate the critical exponent and the hyperscaling
violation parameter in the two phases. We show that our scalar BB solutions
generically emerge as compactifications of p-brane solutions of supergravity
theories. We also derive the short distance form of the correlators for the
scalar operators corresponding to an UV exponential potential supporting our
black brane solution. We show that also for negative values of the hyperscaling
violation parameter these correlators have a short distance power-law behavior.Comment: Final version accepted for publication in JHE
Charged Black Branes with Hyperscaling Violating Factor

We present an analytic solution of a charged black hole with hyperscaling
violating factor in an Einstein-Maxwell-Dilaton model where the scalar
potential is key to the existence of a solution. This solution provides a
candidate gravitational description of theories with hyperscaling violation at
both finite temperature and finite charge density. Using this background we
explore certain features of these theories via AdS/CFT correspondence. Finally,
we discuss embeddings based on the well-known sphere reductions of ten and
eleven-dimensional supergravity.Comment: 1+21 pages, section on optical conductivity added, references
  corrected, agrees with published versio
Repressing Anarchy in Neutrino Mass Textures

The recent results that $\theta_{13}$ is relatively large, of the order of
the previous upper bound, and the indications of a sizable deviation of
$\theta_{23}$ from the maximal value are in agreement with the predictions of
Anarchy in the lepton sector. The quark and charged lepton hierarchies can then
be reproduced in a SU(5) GUT context by attributing non-vanishing $U(1)_{FN}$
charges, different for each family, only to the SU(5) tenplet states. The fact
that the observed mass hierarchies are stronger for up quarks than for down
quarks and charged leptons supports this idea. As discussed in the past, in the
flexible context of $SU(5)\otimes U(1)_{FN}$, different patterns of charges can
be adopted going from Anarchy to various types of hierarchy. We revisit this
approach by also considering new models and we compare all versions to the
present data. As a result we confirm that, by relaxing the extreme ansatz of
equal $U(1)_{FN}$ charges for all SU(5) pentaplets and singlets, better
agreement with the data than for Anarchy is obtained without increasing the
model complexity. We also present the distributions obtained in the different
models for the Dirac CP-violating phase. Finally we discuss the relative merits
of these simple models.Comment: v1: 12 pages, 3 figures; v2: 13 pages, 3 figures, text improved,
  matches version accepted for publication; v3: submitted to add an
  acknowledgment to a networ
Drastic Reduction of Cutoff Effects in 2-d Lattice O(N) Models

We investigate the cutoff effects in 2-d lattice O(N) models for a variety of
lattice actions, and we identify a class of very simple actions for which the
lattice artifacts are extremely small. One action agrees with the standard
action, except that it constrains neighboring spins to a maximal relative angle
delta. We fix delta by demanding that a particular value of the step scaling
function agrees with its continuum result already on a rather coarse lattice.
Remarkably, the cutoff effects of the entire step scaling function are then
reduced to the per mille level. This also applies to the theta-vacuum effects
of the step scaling function in the 2-d O(3) model. The cutoff effects of other
physical observables including the renormalized coupling and the mass in the
isotensor channel are also reduced drastically. Another choice, the mixed
action, which combines the standard quadratic with an appropriately tuned large
quartic term, also has extremely small cutoff effects. The size of cutoff
effects is also investigated analytically in 1-d and at N = infinity in 2-d.Comment: 39 pages, 18 figure
Stochastic quantization and holographic Wilsonian renormalization group

We study relation between stochastic quantization and holographic Wilsonian
renormalization group flow. Considering stochastic quantization of the boundary
on-shell actions with the Dirichlet boundary condition for certain $AdS$ bulk
gravity theories, we find that the radial flows of double trace deformations in
the boundary effective actions are completely captured by stochastic time
evolution with identification of the $AdS$ radial coordinate `$r$' with the
stochastic time '$t$' as $r=t$. More precisely, we investigate Langevin
dynamics and find an exact relation between radial flow of the double trace
couplings and 2-point correlation functions in stochastic quantization. We also
show that the radial evolution of double trace deformations in the boundary
effective action and the stochastic time evolution of the Fokker-Planck action
are the same. We demonstrate this relation with a couple of examples:
(minimally coupled)massless scalar fields in $AdS_2$ and U(1) vector fields in
$AdS_4$.Comment: 1+30 pages, a new subsection is added, references are adde
G/G gauged WZW model and Bethe Ansatz for the phase model

We investigate the G/G gauged Wess-Zumino-Witten model on a Riemann surface
from the point of view of the algebraic Bethe Ansatz for the phase model. After
localization procedure is applied to the G/G gauged Wess-Zumino-Witten model,
the diagonal components for group elements satisfy Bethe Ansatz equations for
the phase model. We show that the partition function of the G/G gauged
Wess-Zumino-Witten model is identified as the summation of norms with respect
to all the eigenstates of the Hamiltonian with the fixed number of particles in
the phase model. We also consider relations between the Chern-Simons theory on
$S^1\times\Sigma_h$ and the phase model.Comment: 15 pages.v2: published versio
A four-dimensional approach to quantum field theories

I present a novel Four-Dimensional Regularization/Renormalization approach
(FDR) to ultraviolet divergences in field theories which can be interpreted as
a natural separation between physical and non physical degrees of freedom.
Based on the observation that some infinities can be reabsorbed into the vacuum
expectation value of the fields, rather than into the parameters of the
Lagrangian, a new type of four-dimensional loop integral is introduced (the FDR
integral) which is independent of any UV regulator and respects all properties
required by gauge invariance. FDR reproduces the correct ABJ anomaly and no
change in the definition of gamma_5 is needed. With FDR the possibility is open
for an approach to UV infinities in which the renormalization program is
substituted by a simple reinterpretation of the appearing loop integrals as FDR
ones, leading to important consequences in the context of non-renormalizable
field theories. Finally, I show how FDR can also be used to regularize infrared
and collinear divergences.Comment: 25 pages, 12 figures. A few misprints corrected. Accepted by JHE
Supersymmetric sound in fluids

We consider the hydrodynamics of supersymmetric fluids. Supersymmetry is
broken spontaneously and the low energy spectrum includes a fermionic massless
mode, the $\mathit{phonino}$. We use two complementary approaches to describe
the system: First, we construct a generating functional from which we derive
the equations of motion of the fluid and of the phonino propagating through the
fluid. We write the form of the leading corrections in the derivative
expansion, and show that the so called diffusion terms in the supercurrent are
in fact not dissipative. Second, we use an effective field theory approach
which utilizes a non-linear realization of supersymmetry to analyze the
interactions between phoninos and phonons, and demonstrate the conservation of
entropy in ideal fluids. We comment on possible phenomenological consequences
for gravitino physics in the early universe.Comment: Modified introduction and discussion of diffusion terms in the
  supercurren
A note on higher-derivative actions for free higher-spin fields

Higher-derivative theories of free higher-spin fields are investigated
focusing on their symmetries. Generalizing familiar two-derivative constrained
formulations, we first construct less-constrained Einstein-like and
Maxwell-like higher-derivative actions. Then, we construct Weyl-like actions -
the actions admitting constrained Weyl symmetries - with different numbers of
derivatives. They are presented in a factorized form making use of
Einstein-like and Maxwell-like tensors. The last (highest-derivative) member of
the hierarchy of the Weyl-like actions coincides with the Fradkin-Tseytlin
conformal higher-spin action in four dimensions.Comment: Version to appear in JHEP, 22 page
Non-minimal Universal Extra Dimensions: The strongly interacting sector
  at the Large Hadron Collider

We work out the strongly interacting sector of a non-minimal Universal Extra
Dimension (nmUED) scenario with one flat extra spatial dimension orbifolded on
S^1/Z_2 in the presence of brane-localized kinetic and Yukawa terms. On
compactification, these terms are known to have significant, nontrivial impact
on the masses and the couplings of the Kaluza-Klein (KK) excitations. We study
the masses of the level `1' KK gluon and the quarks and find the modified
strong interaction vertices involving these particles. The scenario conserves
KK parity. Possibility of significant level-mixing among the quarks from
different KK-levels is pointed out with particular reference to the top quark
sector. Cross sections for various generic final states involving level `1'
KK-gluon and KK-quarks from first two generations are estimated at the Large
Hadron Collider (LHC) via an implementation of the scenario in MadGraph-5 with
the help of FeynRules. The decay branching fractions of both strong and weakly
interacting KK excitations are studied to estimate yields in various different
final states involving jets, leptons and missing energy. These are used to put
some conservative constraints on the nmUED parameter space using the latest LHC
data. Nuances of the scenario are elucidated with reference to the minimal
Universal Extra Dimension (mUED) and Supersymmetry (SUSY) and their
implications for the LHC are discussed.Comment: 45 pages, 11 figures, 3 tables (v1); 39 pages, 8 figures, 4 tables
  (v2): Version accepted in JHEP. Some sections are added/modifie
NLL resummation for the static potential in N=4 SYM theory

We determine the complete NLL running of the static potential associated with
the locally 1/2 BPS Wilson loop in N=4 supersymmetric Yang-Mills theory. We
present results for the SU(N_c) singlet as well as for the adjoint
configuration and arbitrary N_c at weak coupling. In order to derive the
respective anomalous dimensions we perform a two-loop calculation in the N=4
supersymmetric version of the effective field theory pNRQCD. In addition we
confirm the recently obtained fixed-order result for the singlet static
potential generated exclusively by ladder diagrams to the third order in the
t`Hooft coupling. We also give an explicit expression for the logarithmic
contribution of all non-ladder diagrams at this order.Comment: 22 pages, 1 figure, 2 appendices; minor changes, reference + footnote
  added, matches published versio
Single Spin Asymmetry in Lepton Angular Distribution of Drell-Yan
  Processes

We study the single spin asymmetry in the lepton angular distribution of
Drell-Yan processes in the frame work of collinear factorization. The asymmetry
has been studied in the past and different results have been obtained. In our
study we take an approach different than that used in the existing study. We
explicitly calculate the transverse-spin dependent part of the differential
cross-section with suitable parton states. Because the spin is transverse, one
has to take multi-parton states for the purpose. Our result agrees with one of
the existing results. A possible reason for the disagreement with others is
discussed.Comment: Typos corrected. Conclusions unchange