pinecone/core-2020-05-10-deduplication huggingface dataset:
Scalar Representations and Minimal Flavor Violation

We discuss the representations that new scalar degrees of freedom (beyond
those in the minimal standard model) can have if they couple to quarks in a way
that is consistent with minimal flavor violation. If the new scalars are
singlets under the flavor group then they must be color singlets or color
octets. In this paper we discuss the allowed representations and renormalizable
couplings when the new scalars also transform under the flavor group. We find
that color \bar{3} and 6 representations are also allowed. We focus on the
cases where the new scalars can have renormalizable Yukawa couplings to the
quarks without factors of the quark Yukawa matrices. The renormalizable
couplings in the models we introduce automatically conserve baryon number.Comment: 18 pages, 2 figures V2: Lepton MFV protection of baryon number
  discusse
AdS/QCD: The Relevance of the Geometry

We investigate the relevance of the metric and of the geometry in
five-dimensional models of hadrons. Generically, the metric does not affect
strongly the results and even flat space agrees reasonably well with the data.
Nevertheless, we observe a preference for a decreasing warp factor, for example
AdS space. The Sakai-Sugimoto model reduces to one of these models and the
level of agreement is similar to the one of flat space. We also consider the
discrete version of the five-dimensional models, obtained by dimensional
deconstruction. We find that essentially all the relevant features of
"holographic" models of QCD can be reproduced with a simple 3-site model
describing only the states below the cut-off of the theory.Comment: 25 pages + appendix. v2 minor changes and Refs. adde
Mass-Matching in Higgsless

Modern extra-dimensional Higgsless scenarios rely on a mass-matching between
fermionic and bosonic KK resonances to evade constraints from precision
electroweak measurements. After analyzing all of the Tevatron and LEP bounds on
these so-called Cured Higgsless scenarios, we study their LHC signatures and
explore how to identify the mass-matching mechanism, the key to their
viability. We find singly and pair produced fermionic resonances show up as
clean signals with 2 or 4 leptons and 2 hard jets, while neutral and charged
bosonic resonances are visible in the dilepton and leptonic WZ channels,
respectively. A measurement of the resonance masses from these channels shows
the matching necessary to achieve $S\simeq 0$. Moreover, a large single
production of KK-fermion resonances is a clear indication of compositeness of
SM quarks. Discovery reach is below 10 fb$^{-1}$ of luminosity for resonances
in the 700 GeV range.Comment: 28 pages, 18 figure
Scattering into the fifth dimension of N=4 super Yang-Mills

We study an alternative to dimensional regularisation of planar scattering
amplitudes in N=4 super Yang-Mills theory by going to the Coulomb phase of the
theory. The infrared divergences are regulated by masses obtained from a Higgs
mechanism, allowing us to work in four dimensions. The corresponding string
theory set-up suggests that the amplitudes have an exact dual conformal
symmetry. The latter acts on the kinematical variables of the amplitudes as
well as on the Higgs masses in an effectively five dimensional space. We
confirm this expectation by an explicit calculation in the gauge theory. A
consequence of this exact dual conformal symmetry is a significantly reduced
set of scalar basis integrals that are allowed to appear in an amplitude. For
example, triangle sub-graphs are ruled out. We argue that the study of
exponentiation of amplitudes is simpler in the Higgsed theory because
evanescent terms in the mass regulator can be consistently dropped. We
illustrate this by showing the exponentiation of a four-point amplitude to two
loops. Finally, we also analytically compute the small mass expansion of a
two-loop master integral with an internal mass.Comment: 35 pages, many figures. v2: typos and references fixed. v3: minor
  changes, version to be published in JHE
The large N limit of four dimensional Yang-Mills field coupled to
  adjoint fermions on a single site lattice

We consider the large N limit of four dimensional SU(N) Yang-Mills field
coupled to adjoint fermions on a single site lattice. We use perturbative
techniques to show that the Z^4_N center-symmetries are broken with naive
fermions but they are not broken with overlap fermions. We use numerical
techniques to support this result. Furthermore, we present evidence for a
non-zero chiral condensate for one and two Majorana flavors at one value of the
lattice gauge coupling.Comment: 21 pages, 13 figures; a reference added; version to be published in
  JHEP, small clarifications and references adde
Infrared stability of ABJ-like theories

We consider marginal deformations of the superconformal ABJM/ABJ models which
preserve N=2 supersymmetry. We determine perturbatively the spectrum of fixed
points and study their infrared stability. We find a closed line of fixed
points which is IR stable. The fixed point corresponding to the ABJM/ABJ models
is stable under marginal deformations which respect the original SU(2)xSU(2)
invariance, while deformations which break this group destabilize the theory
which then flows to a less symmetric fixed point. We discuss the addition of
flavor degrees of freedom. We prove that in general a flavor marginal
superpotential does not destabilize the system in the IR. An exception is
represented by a marginal coupling which mixes matter charged under different
gauge sectors. Finally, we consider the case of relevant deformations which
should drive the system to a strongly coupled IR fixed point recently
investigated in arXiv:0909.2036 [hep-th].Comment: 1+11 pages, 4 figures; v2: minor correction
Godel space from wrapped M2-branes

We show that M-theory admits a supersymmetric compactification to the Godel universe of the form Godel3 x S2 x CY3. We interpret this geometry as coming from the backreaction of M2-branes wrapping the S2 in an AdS3 x S2 x CY3 flux compactification. In the black hole deconstruction proposal similar states give rise to the entropy of a D4-D0 black hole. The system is effectively described by a three-dimensional theory consisting of an axion-dilaton coupled to gravity with a negative cosmological constant. Other embeddings of the three-dimensional theory imply similar supersymmetric Godel compactifications of type IIA/IIB string theory and F-theory.status: publishe
Heterotic Resolved Conifolds with Torsion, from Supergravity to CFT

We obtain a family of heterotic supergravity backgrounds describing
non-Kahler warped conifolds with three-form flux and an Abelian gauge bundle,
preserving N=1 supersymmetry in four dimensions. At large distance from the
singularity the usual Ricci-flat conifold is recovered. By performing a Z_2
orbifold of the T^{1,1} base, the conifold singularity can be blown-up to a
four-cycle, leading to a completely smooth geometry. Remarkably, the throat
regions of the solutions, which can be isolated from the asymptotic Ricci-flat
geometry using a double-scaling limit, possess a worldsheet CFT description in
terms of heterotic cosets whose target space is the warped resolved
orbifoldized conifold. Thus this construction provides exact solutions of the
modified Bianchi identity. By solving algebraically these CFTs we compute the
exact tree-level heterotic string spectrum and describe worldsheet
non-perturbative effects. The holographic dual of these solutions, in
particular their confining behavior, and the embedding of these fluxed
singularities into heterotic compactifications with torsion are also discussed.Comment: 52 pages, 5 figures; v2: small correction
Running Gauge Coupling in Asymptotically Safe Quantum Gravity

We investigate the non-perturbative renormalization group behavior of the
gauge coupling constant using a truncated form of the functional flow equation
for the effective average action of the Yang-Mills-gravity system. We find a
non-zero quantum gravity correction to the standard Yang-Mills beta function
which has the same sign as the gauge boson contribution. Our results fit into
the picture according to which Quantum Einstein Gravity (QEG) is asymptotically
safe, with a vanishing gauge coupling constant at the non-trivial fixed point.Comment: 27 page
Supersymmetric AdS_4 black holes and attractors

Using the general recipe given in arXiv:0804.0009, where all timelike
supersymmetric solutions of N=2, D=4 gauged supergravity coupled to abelian
vector multiplets were classified, we construct the first examples of genuine
supersymmetric black holes in AdS_4 with nonconstant scalar fields. This is
done for various choices of the prepotential, amongst others for the STU model.
These solutions permit to study the BPS attractor flow in AdS. We also
determine the most general supersymmetric static near-horizon geometry and
obtain the attractor equations in gauged supergravity. As a general feature we
find the presence of flat directions in the black hole potential, i.e.,
generically the values of the moduli on the horizon are not completely
specified by the charges. For one of the considered prepotentials, the
resulting moduli space is determined explicitely. Still, in all cases, we find
that the black hole entropy depends only on the charges, in agreement with the
attractor mechanism.Comment: 25 pages, uses JHEP3.cl
Witten index in supersymmetric 3d theories revisited

We have performed a direct calculation of Witten index in N = 1,2,3
supersymmetric Yang-Mills Chern-Simons 3d theories. We do it in the framework
of Born-Oppenheimer (BO) approach by putting the system into a small spatial
box and studying the effective Hamiltonian depending on the zero field
harmonics. At the tree level, our results coincide with the results of Witten,
but there is a difference in the way the loop effects are implemented. In
Witten's approach, one has only take into account the fermion loops, which
bring about a negative shift of the (chosen positive at the tree level)
Chern-Simons coupling k. As a result, Witten index vanishes and supersymmetry
is broken at small k. In the effective BO Hamiltonian framework, fermion, gluon
and ghost loops contribute on an equal footing. Fermion loop contribution to
the effective Hamiltonian can be evaluated exactly, and their effect amounts to
the negative shift k -> k - h/2 for N =1 and k -> k - h for N = 2,3 in the
tree-level formulae for the index. In our approach, with rather natural
assumptions on the structure of bosonic corrections, the shift k -> k + h
brought about by the gluon loops also affects the index. Since the total shift
of k is positive or zero, Witten index appears to be nonzero at nonzero k, and
supersymmetry is not broken. We discuss possible reasons for such disagreement.Comment: A bug in Eq.(2.20) is fixe
The deconfinement transition of finite density QCD with heavy quarks
  from strong coupling series

Starting from Wilson's action, we calculate strong coupling series for the
Polyakov loop susceptibility in lattice gauge theories for various small N_\tau
in the thermodynamic limit. Analysing the series with Pad\'e approximants, we
estimate critical couplings and exponents for the deconfinement phase
transition. For SU(2) pure gauge theory our results agree with those from
Monte-Carlo simulations within errors, which for the coarser N_\tau=1,2
lattices are at the percent level. For QCD we include dynamical fermions via a
hopping parameter expansion. On a N_\tau=1 lattice with N_f=1,2,3, we locate
the second order critical point where the deconfinement transition turns into a
crossover. We furthermore determine the behaviour of the critical parameters
with finite chemical potential and find the first order region to shrink with
growing \mu. Our series moreover correctly reflects the known Z(N) transition
at imaginary chemical potential.Comment: 18 pages, 7 figures, typos corrected, version published in JHE
Automorphic properties of (2, 0) theory on T6

We consider ADE-type (2, 0) theory on a family of flat six-tori endowed with
flat Sp(4) connections coupled to the R-symmetry. Our main objects of interest
are the components of the `partition vector' of the theory. These constitute an
element of a certain finite dimensional vector space, carrying an irreducible
representation of a discrete Heisenberg group related to the 't Hooft fluxes of
the theory. Covariance under the SL_6(Z) mapping class group of a six-torus
amounts to a certain automorphic transformation law for the partition vector,
which we derive. Because of the absence of a Lagrangian formulation of (2, 0)
theory, this transformation property is not manifest, and gives useful
non-trivial constraints on the partition vector. As an application, we derive a
shifted quantization law for the spatial momentum of (2, 0) theory on a
space-time of the form R x T5. This quantization law is in agreement with an
earlier result based on the relationship between (2, 0) theory and maximally
supersymmetric Yang-Mills theory together with certain geometric facts about
gauge bundles.Comment: 15 page
Scalar hairs and exact vortex solutions in 3D AdS gravity

We investigate three-dimensional (3D) Anti-de Sitter (AdS) gravity coupled to
a complex scalar field \phi with self-interaction potential V(|\phi|). We show
that the mass of static, rotationally symmetric, AdS black hole with scalar
hairs is determined algebraically by the scalar charges. We recast the field
equations as a linear system of first order differential equations. Exact
solutions, describing 3D AdS black holes with real spherical scalar hairs and
vortex-black hole solutions are derived in closed form for the case of a scalar
field saturating the Breitenlohner-Freedman (BF) bound and for a scalar field
with asymptotic zero mass. The physical properties of these solutions are
discussed. In particular, we show that the vortex solution interpolates between
two different AdS_{3} vacua, corresponding respectively to a
U(1)-symmetry-preserving maximum and to a symmetry-breaking minimum of the
potential V.Comment: 12 pages, 2 figure
Wilson Expansion of QCD Propagators at Three Loops: Operators of
  Dimension Two and Three

In this paper we construct the Wilson short distance operator product
expansion for the gluon, quark and ghost propagators in QCD, including
operators of dimension two and three, namely, A^2, m^2, m A^2, \ovl{\psi} \psi
and m^3. We compute analytically the coefficient functions of these operators
at three loops for all three propagators in the general covariant gauge. Our
results, taken in the Landau gauge, should help to improve the accuracy of
extracting the vacuum expectation values of these operators from lattice
simulation of the QCD propagators.Comment: 20 pages, no figure
Three Generations on the Quintic Quotient

A three-generation SU(5) GUT, that is 3x(10+5bar) and a single 5-5bar pair,
is constructed by compactification of the E_8 heterotic string. The base
manifold is the Z_5 x Z_5-quotient of the quintic, and the vector bundle is the
quotient of a positive monad. The group action on the monad and its
bundle-valued cohomology is discussed in detail, including topological
restrictions on the existence of equivariant structures. This model and a
single Z_5 quotient are the complete list of three generation quotients of
positive monads on the quintic.Comment: 19 pages, LaTeX. v2: section on anomaly cancellation adde
Global AdS Picture of 1/2 BPS Wilson Loops

We study the holographic dual string configuration of 1/2 BPS circular Wilson
loops in N=4 super Yang-Mills theory by using the global coordinate of AdS. The
dual string worldsheet is given by the Poincare disk AdS_2 sitting at a
constant global time slice of AdS_5. We also analyze the correlator of two
concentric circular Wilson loops from the global AdS perspective and study the
phase transition associated with the instability of annulus worldsheet
connecting the two Wilson loops.Comment: 14 pages, 3 figures, v2: discussion on two branches corrected, v3:
  reference adde
On AGT description of N=2 SCFT with N_f=4

We consider Alday-Gaiotto-Tachikawa (AGT) realization of the Nekrasov
partition function of N=2 SCFT. We focus our attention on the SU(2) theory with
N_f=4 flavor symmetry, whose partition function, according to AGT, is given by
the Liouville four-point function on the sphere. The gauge theory with N_f=4 is
known to exhibit SO(8) symmetry. We explain how the Weyl symmetry
transformations of SO(8) flavor symmetry are realized in the Liouville theory
picture. This is associated to functional properties of the Liouville
four-point function that are a priori unexpected. In turn, this can be thought
of as a non-trivial consistency check of AGT conjecture. We also make some
comments on elementary surface operators and WZW theory.Comment: 18 pages. v2, a misinterpretation in the gauge theory side has been
  corrected; title and introduction were changed accordingl
Comments on large-N volume independence

We study aspects of the large-N volume independence on R**3 x L**G, where
L**G is a G-site lattice for Yang-Mills theory with adjoint Wilson-fermions. We
find the critical number of lattice sites above which the center-symmetry
analysis on L**G agrees with the one on the continuum S**1. For Wilson
parameter set to one and G>=2, the two analyses agree. One-loop radiative
corrections to Wilson-line masses are finite, reminiscent of the
UV-insensitivity of the Higgs mass in deconstruction/Little-Higgs theories.
Even for theories with G=1, volume independence in QCD(adj) may be guaranteed
to work by tuning one low-energy effective field theory parameter. Within the
parameter space of the theory, at most three operators of the 3d effective
field theory exhibit one-loop UV-sensitivity. This opens the analytical
prospect to study 4d non-perturbative physics by using lower dimensional field
theories (d=3, in our example).Comment: 12 pages; added small clarifications, published versio
Black holes and black strings in plane waves

We investigate the construction of black holes and black strings in vacuum
plane wave spacetimes using the method of matched asymptotic expansions. We
find solutions of the linearised equations of motion in the asymptotic region
for a general source on a plane wave background. We observe that these
solutions do not satisfy our previously defined conditions for being
asymptotically plane wave. Hence, the space of asymptotically plane wave
solutions is restricted. We consider the solution in the near region, treating
the plane wave as a perturbation of a black object, and find that there is a
regular black string solution but no regular black hole solution.Comment: 28 pages, v2: minor changes, added referenc
Type IIA orientifold compactification on SU(2)-structure manifolds

We investigate the effective theory of type IIA string theory on
six-dimensional orientifold backgrounds with SU(2)-structure. We focus on the
case of orientifolds with O6-planes, for which we compute the bosonic effective
action in the supergravity approximation. For a generic SU(2)-structure
background, we find that the low-energy effective theory is a gauged N=2
supergravity where moduli in both vector and hypermultiplets are charged. Since
all these supergravities descend from a corresponding N=4 background, their
scalar target space is always a quotient of a SU(1,1)/U(1) x
SO(6,n)/SO(6)xSO(n) coset, and is therefore also very constrained.Comment: 31 pages; v2: local report number adde
Gauge fields in (A)dS within the unfolded approach: algebraic aspects

It has recently been shown that generalized connections of the (A)dS space
symmetry algebra provide an effective geometric and algebraic framework for all
types of gauge fields in (A)dS, both for massless and partially-massless. The
equations of motion are equipped with a nilpotent operator called $\sigma_-$
whose cohomology groups correspond to the dynamically relevant quantities like
differential gauge parameters, dynamical fields, gauge invariant field
equations, Bianchi identities etc. In the paper the $\sigma_-$-cohomology is
computed for all gauge theories of this type and the field-theoretical
interpretation is discussed. In the simplest cases the $\sigma_-$-cohomology is
equivalent to the ordinary Lie algebra cohomology.Comment: 59 pages, replaced with revised verio
Higgs boson production in photon-photon collision at ILC: a comparative
  study in different little Higgs models

We study the process \gamma\gamma->h->bb_bar at ILC as a probe of different
little Higgs models, including the simplest little Higgs model (SLH), the
littlest Higgs model (LH), and two types of littlest Higgs models with T-parity
(LHT-I, LHT-II). Compared with the Standard Model (SM) prediction, the
production rate is found to be sizably altered in these little Higgs models
and, more interestingly, different models give different predictions. We find
that the production rate can be possibly enhanced only in the LHT-II for some
part of the parameter space, while in all other cases the rate is suppressed.
The suppression can be 10% in the LH and as much as 60% in both the SLH and the
LHT-I/LHT-II. The severe suppression in the SLH happens for a large \tan\beta
and a small m_h, in which the new decay mode h->\eta\eta (\eta is a light
pseudo-scalar) is dominant; while for the LHT-I/LHT-II the large suppression
occurs when f and m_h are both small so that the new decay mode h->A_H A_H is
dominant. Therefore, the precision measurement of such a production process at
the ILC will allow for a test of these models and even distinguish between
different scenarios.Comment: Version in JHEP (h-g-g & h-gamma-gamma expressions added
Precise Predictions for Higgs Production in Neutralino Decays in the
  Complex MSSM

Complete one-loop results are obtained for the class of processes
chi^0_i->chi^0_j h_a in the MSSM where all parameters entering this process
beyond lowest order are allowed to have arbitrary CP-violating phases. An
on-shell renormalisation scheme is worked out for the chargino-neutralino
sector that properly takes account of imaginary parts arising from complex
parameters and from absorptive parts of loop integrals. The genuine vertex
contributions to the neutralino decay amplitudes are combined with two-loop
propagator-type corrections for the outgoing Higgs boson. In this way the
currently most precise prediction for this class of processes is obtained. The
numerical impact of the genuine vertex corrections is studied for several
examples of CP-conserving and CP-violating scenarios. We find that significant
effects on the decay widths and branching ratios are possible even in the
CP-conserving MSSM. In the CP-violating CPX benchmark scenario the corrections
to the decay width are found to be particularly large, namely, of order 45% for
a Higgs mass of 40 GeV. This parameter region of the CPX scenario where a very
light Higgs boson is unexcluded by present data is analysed in detail. We find
that in this parameter region, which will be difficult to cover by standard
Higgs search channels at the LHC, the branching ratio for the decay
chi^0_2->chi^0_1 h_1 is large. This may offer good prospects to detect such a
light Higgs boson in cascade decays of supersymmetric particles.Comment: 24 pages, 6 figure
Y-system and Quasi-Classical Strings

Recently Kazakov, Vieira and the author conjectured the Y-system set of
equations describing the planar spectrum of AdS/CFT. In this paper we solve the
Y-system equations in the strong coupling scaling limit. We show that the
quasi-classical spectrum of string moving inside AdS3 x S1 matches precisely
with the prediction of the Y-system. Thus the Y-system, unlike the asymptotic
Bethe ansatz, describes correctly the spectrum of one-loop string energies
including all exponential finite size corrections. This gives a very
non-trivial further support in favor of the conjecture.Comment: references added, published versio