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24938113 | 10.1007/JHEP11(2013)055 | It was recently argued that certain relativistic theories at finite density
can exhibit an unconventional spectrum of Goldstone excitations, with gapped
Goldstones whose gap is exactly calculable in terms of the symmetry algebra. We
confirm this result as well as previous ones concerning gapless Goldstones for
non-relativistic systems via a coset construction of the low-energy effective
field theory. Moreover, our analysis unveils additional gapped Goldstones,
naturally as light as the others, but this time with a model-dependent gap.
Their exact number cannot be inferred solely from the symmetry breaking pattern
either, but rather depends on the details of the symmetry breaking mechanism--a
statement that we explicitly verify with a number of examples. Along the way we
provide what we believe to be a particularly transparent interpretation of the
so-called inverse-Higgs constraints for spontaneously broken spacetime
symmetries.Comment: 50 pages. v2: Fixed several typos in equations. Minor modifications
to the counting rule. Acknowledgements and references added. Matches JHEP
versio | More on gapped Goldstones at finite density: More gapped Goldstones | more on gapped goldstones at finite density: more gapped goldstones | argued relativistic exhibit unconventional goldstone excitations gapped goldstones calculable algebra. confirm concerning gapless goldstones relativistic coset theory. unveils gapped goldstones naturally gap. inferred solely breaking breaking statement explicitly verify examples. believe transparent spontaneously broken spacetime pages. typos equations. minor modifications counting rule. acknowledgements added. matches jhep versio | non_dup | [] |
24931414 | 10.1007/JHEP11(2013)056 | In 4-dimensional supergravity theories, covariant under symplectic
electric-magnetic duality rotations, a significant role is played by the
symplectic matrix M({\phi}), related to the coupling of scalars {\phi} to
vector field-strengths. In particular, this matrix enters the twisted
self-duality condition for 2-form field strengths in the symplectic formulation
of generalized Maxwell equations in the presence of scalar fields. In this
investigation, we compute several properties of this matrix in relation to the
attractor mechanism of extremal (asymptotically flat) black holes. At the
attractor points with no flat directions (as in the N = 2 BPS case), this
matrix enjoys a universal form in terms of the dyonic charge vector Q and the
invariants of the corresponding symplectic representation RQ of the duality
group G, whenever the scalar manifold is a symmetric space with G simple and
non-degenerate of type E7. At attractors with flat directions, M still depends
on flat directions, but not MQ, defining the so-called Freudenthal dual of Q
itself. This allows for a universal expression of the symplectic vector field
strengths in terms of Q, in the near-horizon Bertotti-Robinson black hole
geometry.Comment: 1+31 pages, 1 Table; v2 : completely reorganized (and shortened)
structure, some Sections removed; various clarifications, formulae, and Refs.
added; to appear on JHE | Dualities Near the Horizon | dualities near the horizon | supergravity covariant symplectic duality rotations played symplectic scalars strengths. enters twisted duality strengths symplectic formulation maxwell fields. attractor extremal asymptotically holes. attractor directions enjoys universal dyonic invariants symplectic duality whenever manifold degenerate attractors directions directions defining freudenthal itself. universal symplectic strengths horizon bertotti robinson pages reorganized shortened removed clarifications formulae refs. | non_dup | [] |
24948585 | 10.1007/JHEP11(2013)059 | We present the complete form of the decoupling limit of ghost-free massive
gravity with a Minkowski reference metric, including the full interactions of
the helicity-1 and helicity-0 modes of the massive spin-2 field. While in the
metric language the square root structure of the mass terms makes it difficult
to find a simple way to write down the interactions, we show that using the
vierbein formulation of massive gravity, including Stueckelberg fields for both
diffeomorphism and local Lorentz symmetries, we can find an explicitly resummed
expression for the helicity-1 field interactions. We clarify the equations of
motion for the Lorentz Stueckelberg fields and how these generate the symmetric
vierbein condition which guarantees equivalence between the vierbein and metric
formulations of massive gravity.Comment: 20 pages, typos corrected, references adde | Complete Decoupling Limit of Ghost-free Massive Gravity | complete decoupling limit of ghost-free massive gravity | decoupling ghost massive minkowski helicity helicity massive field. vierbein formulation massive stueckelberg diffeomorphism lorentz symmetries explicitly resummed helicity interactions. clarify lorentz stueckelberg vierbein guarantees equivalence vierbein formulations massive pages typos corrected adde | non_dup | [] |
24950157 | 10.1007/JHEP11(2013)063 | We analyse the breaking of conformal invariance for null polygonal Wilson
loops in ${\cal N}=4$ SYM beyond that induced by the UV divergences due to the
cusps. It only shows up in exceptional configurations, where the polygon
intersects the critical light cone of an inversion or a special conformal
transformation. In comparison with the related study for the Euclidean version
by Drukker and Gross, we find different leading terms both for weak as well as
for strong coupling. Hence the conformal anomaly due to intersections of a null
polygon with a critical light cone defines a new universal function of the
coupling constant.Comment: 17 pages, 7 figures, sign error in (20) corrected, comment on smooth
space-like contours added, version to appear in JHE | Exceptional conformal anomaly of null polygonal Wilson loops | exceptional conformal anomaly of null polygonal wilson loops | analyse breaking conformal invariance polygonal wilson loops divergences cusps. exceptional configurations polygon intersects cone inversion conformal transformation. euclidean drukker gross coupling. conformal anomaly intersections polygon cone defines universal pages corrected comment contours | non_dup | [] |
24952380 | 10.1007/JHEP11(2013)065 | We consider the on-shell amplitudes in N=(1,1) SYM in D=6 dimensions within
the spinor helicity and on-shell superspace formalism. This leads to an
effective and straightforward technique reducing the calculation to a set of
scalar master integrals. As an example, the simplest four point amplitude is
calculated in one and two loops in the planar limit. All answers are UV and IR
finite and expressed in terms of logs and Polylogs of transcendentality level 2
at one loop, and 4 and 3 at two loops. The all loop asymptotical limit at high
energy is obtained which exhibits the Regge type behaviour. The intercept is
calculated in the planar limit and is equal to alpha(t)=1+\sqrt{g_{YM}^2
N_c|t|/32pi^3}.Comment: Latex, 24 pages, 4 figures, v2 typos corrected, references adde | On the amplitudes in N=(1,1) D=6 SYM | on the amplitudes in n=(1,1) d=6 sym | amplitudes spinor helicity superspace formalism. straightforward reducing master integrals. simplest loops planar limit. answers logs polylogs transcendentality loops. asymptotical exhibits regge behaviour. intercept planar alpha sqrt .comment latex pages typos corrected adde | non_dup | [] |
24954142 | 10.1007/JHEP11(2013)066 | The leading contributions from heavy new physics to Higgs processes can be
captured in a model-independent way by dimension-six operators in an effective
Lagrangian approach. We present a complete analysis of how these contributions
affect Higgs couplings. Under certain well-motivated assumptions, we find that
8 CP-even plus 3 CP-odd Wilson coefficients parametrize the main impact in
Higgs physics, as all other coefficients are constrained by non-Higgs SM
measurements. We calculate the most relevant anomalous dimensions for these
Wilson coefficients, which describe operator mixing from the heavy scale down
to the electroweak scale. This allows us to find the leading-log corrections to
the predictions for the Higgs couplings in specific models, such as the MSSM or
composite Higgs, which we find to be significant in certain cases.Comment: 45 pages. Some minor typos fixed. Matches published versio | Higgs windows to new physics through d = 6 operators: Constraints and
one-loop anomalous dimensions | higgs windows to new physics through d = 6 operators: constraints and one-loop anomalous dimensions | captured lagrangian approach. couplings. motivated assumptions wilson parametrize constrained measurements. anomalous wilson electroweak scale. couplings mssm composite pages. minor typos fixed. matches versio | non_dup | [] |
24945375 | 10.1007/JHEP11(2013)067 | Within the effective theory for the Color Glass Condensate, we study
multi-particle production with rapidity correlations in proton-nucleus
collisions at high energy. The high-energy evolution responsible for such
correlations is governed by a generalization of the JIMWLK equation which
describes the simultaneous evolution of the (strong) nuclear color fields in
the direct amplitude and the complex conjugate amplitude. This functional
equation can be used to derive ordinary evolution equations for the
cross-sections for particle production (a generalization of the Balitsky
hierarchy). However, the ensuing equations appear to be too complicated to be
useful in practice, including in the limit where the number of colors is large.
To circumvent this problem, we propose an alternative formulation of the
high-energy evolution as a Langevin process, which is better suited for
numerical implementations. This process is directly oriented towards the
calculation of the cross-sections, so its detailed structure depends upon the
nature of the final state. We present the stochastic equations appropriate for
two gluon production, and also for three gluon production, with generic
rapidity differences.Comment: 28 pages, 5 figure | JIMWLK evolution for multi-particle production in Langevin form | jimwlk evolution for multi-particle production in langevin form | glass condensate rapidity proton nucleus collisions energy. governed generalization jimwlk describes simultaneous conjugate amplitude. derive ordinary generalization balitsky hierarchy ensuing complicated colors large. circumvent propose formulation langevin suited implementations. oriented state. stochastic gluon gluon generic rapidity pages | non_dup | [] |
24961381 | 10.1007/JHEP11(2013)068 | Zero temperature spectra of mesons and glueballs are analyzed in a class of
holographic bottom-up models for QCD in the Veneziano limit, N_c -> infinity,
N_f -> infinity, with x = N_f/N_c fixed (V-QCD). The backreaction of flavor on
color is fully included. It is found that spectra are discrete and gapped
(modulo the pions) in the QCD regime, for x below the critical value x_c where
the conformal transition takes place. The masses uniformly converge to zero in
the walking region x -> x_c^- due to Miransky scaling. All the ratios of masses
asymptote to non-zero constants as x -> x_c^- and therefore there is no
"dilaton" in the spectrum. The S-parameter is computed and found to be of O(1)
in units of N_f N_c in the walking regime, while it is always an increasing
function of x. This indicates the presence of a subtle discontinuity of
correlation functions across the conformal transition at x = x_c.Comment: 45 pages plus appendices, 13 figure | The discontinuities of conformal transitions and mass spectra of V-QCD | the discontinuities of conformal transitions and mass spectra of v-qcd | mesons glueballs holographic veneziano infinity infinity backreaction flavor included. gapped modulo pions conformal place. uniformly converge walking miransky scaling. asymptote dilaton spectrum. walking subtle discontinuity conformal pages appendices | non_dup | [] |
24962777 | 10.1007/JHEP11(2013)069 | We investigate finite abelian groups which can represent symmetries of the
N-Higgs-doublet models with quarks. We build a general formalism based on the
powerful method of the Smith normal form and obtain an analytic upper bound on
the order of abelian symmetry groups for any N. We investigate in detail the
case N=2 and rederive known results in a more compact and intuitive fashion. We
also study the NHDM with the maximal finite abelian symmetry for all small N
cases up to N=5, and show that in each case all Yukawa textures compatible with
such symmetry originate from a unique basic structure. This work opens the way
to a systematic exploration of phenomenology of the NHDM with a desired
symmetry, and illustrates the power of the Smith normal form technique.Comment: 31 pages, no figures; v2: extra references, matches published versio | Abelian symmetries of the N-Higgs-doublet model with Yukawa interactions | abelian symmetries of the n-higgs-doublet model with yukawa interactions | abelian symmetries doublet quarks. build formalism powerful analytic abelian rederive intuitive fashion. nhdm maximal abelian yukawa textures compatible originate structure. opens exploration phenomenology nhdm desired illustrates pages extra matches versio | non_dup | [] |
24958528 | 10.1007/JHEP11(2013)070 | We systematically construct a class of two-dimensional $(2,2)$ supersymmetric
gauged linear sigma models with phases in which a continuous subgroup of the
gauge group is totally unbroken. We study some of their properties by employing
a recently developed technique. The focus of the present work is on models with
one K\"ahler parameter. The models include those corresponding to Calabi-Yau
threefolds, extending three examples found earlier by a few more, as well as
Calabi-Yau manifolds of other dimensions and non-Calabi-Yau manifolds. The
construction leads to predictions of equivalences of D-brane categories,
systematically extending earlier examples. There is another type of surprise.
Two distinct superconformal field theories corresponding to Calabi-Yau
threefolds with different Hodge numbers, $h^{2,1}=23$ versus $h^{2,1}=59$, have
exactly the same quantum K\"ahler moduli space. The strong-weak duality plays a
crucial r\^ole in confirming this, and also is useful in the actual computation
of the metric on the moduli space.Comment: 84 pages; typos and simple errors corrected, computation of elliptic
genus and topology added in appendi | Linear Sigma Models With Strongly Coupled Phases -- One Parameter Models | linear sigma models with strongly coupled phases -- one parameter models | systematically supersymmetric gauged sigma subgroup totally unbroken. employing technique. ahler parameter. calabi threefolds extending calabi manifolds calabi manifolds. equivalences brane categories systematically extending examples. surprise. superconformal calabi threefolds hodge ahler moduli space. duality plays crucial confirming moduli pages typos corrected elliptic genus topology appendi | non_dup | [] |
24938112 | 10.1007/JHEP11(2013)071 | We study one-loop photon (Pi) and neutrino (Sigma) self-energies in a U(1)
covariant gauge-theory on d-dimensional noncommutative spaces determined by a
antisymmetric-constant tensor theta^{mu nu}. For the general fermion-photon
(S_f) and photon self-interaction (S_g) the closed form results reveal
self-energies besetting with all kind of pathological terms: the UV divergence,
the quadratic UV/IR mixing terms as well as a logarithmic IR divergent term of
the type ln(mu^2(theta p)^2). In addition, the photon-loop produces new tensor
structures satisfying transversality condition by themselves. We show that the
photon self-energy in four-dimensional Euclidean spacetime can be reduced to
two finite terms by imposing a specific full rank of theta^{mu nu} and setting
deformation parameters (kappa_f,kappa_g)=(0,3). In this case the neutrino
two-point function vanishes. Thus for a specific point (0,3) in the
parameter-space (kappa_f,kappa_g), a covariant theta-exact approach is able to
produce a divergence-free result for one-loop quantum corrections, having also
well-defined both the commutative limit as well as the pointlike limit of an
extended object. While in two-dimensional space the photon self-energy is
finite for arbitrary (kappa_f,kappa_g) combinations, the neutrino self-energy
still contains an superficial IR divergence.Comment: D-dimensional photon-loop contribution added to the photon
self-energy; version to appear in JHEP, 29 pages, 3 figures, 1 tabl | Self-energies on deformed spacetimes | self-energies on deformed spacetimes | sigma covariant noncommutative antisymmetric theta fermion reveal besetting kind pathological divergence quadratic logarithmic divergent theta produces satisfying transversality themselves. euclidean spacetime imposing theta deformation kappa kappa vanishes. kappa kappa covariant theta divergence commutative pointlike object. kappa kappa combinations superficial jhep pages tabl | non_dup | [] |
24954124 | 10.1007/JHEP11(2013)073 | We derive the Thermodynamic Bethe Ansatz equations for the relativistic sigma
model describing the AdS(4)XCP(3) string II A theory at strong coupling (i.e.
in the Alday-Maldacena decoupling limit). The corresponding Y-system involves
an infinite number of Y functions and is of a new type, although it shares a
peculiar feature with the Y-system for AdS(4)XCP(3). A truncation of the
equations at level p and a further generalisation to generic rank N allow us an
alternative description of the theory as the N=4, p= \infty representative in
an infinite family of models corresponding to the conformal cosets CP(N-1)_p X
U(1), perturbed by a relevant composite field \phi(N,p) =\phi_[CP(N-1)_p] X
\phi[U(1)] that couples the two independent conformal field theories. The
calculation of the ultraviolet central charge confirms the conjecture by Basso
and Rej and the conformal dimension of the perturbing operator, at every N and
p, is obtained using the Y-system periodicity. The conformal dimension of
\phi[CP(N-1)_p] matches that of the field identified by Fendley while
discussing integrability issues for the purely bosonic CP(N-1) sigma model.Comment: Latex fil | Exact results for the low energy AdS(4)XCP(3) string theory | exact results for the low energy ads(4)xcp(3) string theory | derive thermodynamic bethe ansatz relativistic sigma describing i.e. alday maldacena decoupling involves infinite shares peculiar truncation generalisation generic infty infinite conformal cosets perturbed composite couples conformal theories. ultraviolet confirms conjecture basso conformal perturbing periodicity. conformal matches fendley discussing integrability purely bosonic sigma latex | non_dup | [] |
24946708 | 10.1007/JHEP11(2013)074 | We consider entanglement entropy in quantum field theories with a gravity
dual. In the gravity description, the leading order contribution comes from the
area of a minimal surface, as proposed by Ryu-Takayanagi. Here we describe the
one loop correction to this formula. The minimal surface divides the bulk into
two regions. The bulk loop correction is essentially given by the bulk
entanglement entropy between these two bulk regions. We perform some simple
checks of this proposal.Comment: 21 pages, 10 figures. V2: reference adde | Quantum corrections to holographic entanglement entropy | quantum corrections to holographic entanglement entropy | entanglement dual. comes takayanagi. formula. divides regions. essentially entanglement regions. checks pages figures. adde | non_dup | [] |
24942867 | 10.1007/JHEP11(2013)075 | In this paper we consider gauged N=2 supergravities which arise in the
low-energy limit of type II string theories and study examples which exhibit
spontaneous partial supersymmetry breaking. For the quantum STU model we derive
the scalar field space and the scalar potential of the N=1 supersymmetric
low-energy effective action. We also study the properties of the Minkowskian
N=1 supersymmetricground states for a broader class of supergravities including
the quantum STU model.Comment: 22 pages, added references, version to appear in JHE | Examples of N=2 to N=1 supersymmetry breaking | examples of n=2 to n=1 supersymmetry breaking | gauged supergravities arise exhibit spontaneous supersymmetry breaking. derive supersymmetric action. minkowskian supersymmetricground broader supergravities pages | non_dup | [] |
24961751 | 10.1007/JHEP11(2013)077 | It is possible to define a general initial state for a quantum field by
introducing a contribution to the action defined at an initial-time boundary.
The propagator for this theory is composed of two parts, one associated with
the free propagation of fields and another produced by the operators of this
initial action. The derivation of this propagator is shown for the case of a
translationally and rotationally invariant initial state. In addition to being
able to treat more general states, these techniques can also be applied to
effective field theories that start from an initial time. The eigenstates of a
theory with interacting heavy and light fields are different from the
eigenstates of the theory in the limit where the interactions vanish.
Therefore, a product of states of the noninteracting heavy and light theories
will usually contain excitations of the heavier state once the interactions are
included. Such excitations appear as nonlocal effects in the effective theory,
which are suppressed by powers of the mass of the heavy field. By appropriately
choosing the initial action, these excitations can be excised from the state
leaving just effects that would be produced by a local action of the lighter
fields.Comment: 16 pages, no figure | Initial state propagators | initial state propagators | introducing boundary. propagator composed propagation action. derivation propagator translationally rotationally state. treat time. eigenstates interacting eigenstates vanish. noninteracting excitations heavier included. excitations nonlocal suppressed powers field. appropriately choosing excitations excised leaving lighter pages | non_dup | [] |
24953914 | 10.1007/JHEP11(2013)079 | The vorticity statistics characterises both the direct and the inverse
turbulent cascades of two-dimensional fluid flows. The fluid/gravity
correspondence relates fluid flows to black brane dynamics. We construct the
holographic vorticity for relativistic and non-relativistic fluids in terms of
the gravitational black brane data, and relate it to the horizon vorticity
expressed as a Weyl scalar. We discuss the statistical scaling structure of the
horizon geometry.Comment: 13 pages, v2: fixed typos, minor improvement | Holographic Vorticity in the Fluid/Gravity Correspondence | holographic vorticity in the fluid/gravity correspondence | vorticity characterises turbulent cascades flows. correspondence relates flows brane dynamics. holographic vorticity relativistic relativistic fluids gravitational brane relate horizon vorticity weyl scalar. horizon pages typos minor | non_dup | [] |
24963486 | 10.1007/JHEP11(2013)080 | We study the single soft-gluon current at two loops with two energetic
partons in massless perturbative QCD, which describes, for example, the soft
limit of the two-loop amplitude for $gg\to Hg$. The results are presented as
Laurent expansions in $\epsilon$ in $D=4-2\epsilon$ spacetime dimension. We
calculate the expansion to order $\epsilon^2$ analytically, which is a
necessary ingredient for Higgs production at hadron colliders at
next-to-next-to-next-to-leading order in the soft-virtual approximation. We
also give two-loop results of the single soft-gluon current in ${\cal N}=4$
Super-Yang-Mills theory, and find that it has uniform transcendentality. By
iteration relation of splitting amplitudes, our calculations can determine the
three-loop single soft-gluon current to order $\epsilon^0$ in ${\cal N}=4$
Super-Yang-Mills theory in the limit of large $N_c$.Comment: typos corrected; journal versio | Single soft gluon emission at two loops | single soft gluon emission at two loops | gluon loops energetic partons massless perturbative describes laurent expansions epsilon epsilon spacetime dimension. epsilon analytically ingredient hadron colliders virtual approximation. gluon super mills transcendentality. iteration splitting amplitudes gluon epsilon super mills .comment typos corrected versio | non_dup | [] |
24960771 | 10.1007/JHEP11(2013)081 | We show that appropriately supersymmetrized smooth Maldacena-Wilson loop
operators in N=4 super Yang-Mills theory are invariant under a Yangian symmetry
Y[psu(2,2|4)] built upon the manifest superconformal symmetry algebra of the
theory. The existence of this hidden symmetry is demonstrated at the one-loop
order in the weak coupling limit as well as at leading order in the strong
coupling limit employing the classical integrability of the dual AdS_5 x S^5
string description. The hidden symmetry generators consist of a canonical
non-local second order variational derivative piece acting on the superpath,
along with a novel local path dependent contribution. We match the functional
form of these Yangian symmetry generators at weak and strong coupling and find
evidence for an interpolating function. Our findings represent the smooth
counterpart to the Yangian invariance of scattering superamplitudes dual to
light-like polygonal super Wilson loops in the N=4 super Yang-Mills theory.Comment: 36 pages, 1 figure. v2: Typos corrected, version to be published in
JHE | Yangian Symmetry of smooth Wilson Loops in N=4 super Yang-Mills Theory | yangian symmetry of smooth wilson loops in n=4 super yang-mills theory | appropriately supersymmetrized maldacena wilson super mills yangian built manifest superconformal theory. hidden employing integrability description. hidden generators consist canonical variational piece acting superpath contribution. match yangian generators interpolating function. counterpart yangian invariance superamplitudes polygonal super wilson loops super mills pages figure. typos corrected | non_dup | [] |
24940242 | 10.1007/JHEP11(2013)082 | The CCFM equation and its extended form with a quadratic term (KGBJS
equation) are solved with fixed and running coupling constant. The solution of
the KGBJS equation is compared to gluon densities resulting from the CCFM and
BK equations. As the saturation scale $Q_s$ now becomes available as a function
of the hard scale $p$ we observe that low values of $p$ impede its growth with
$\frac 1 x$. Also, at values much larger than partons transversal momentum the
saturation effects become independent on the hard scale what we call liberation
of saturation scale. We also introduce the hard-scale-related saturation scale
$P_s$ and investigate its energy dependence. We observe that the new scale as a
function of $x$ decreases starting from the value of transversal momentum of
gluon | Gluon saturation scale from the KGBJS equation | gluon saturation scale from the kgbjs equation | ccfm quadratic kgbjs solved running constant. kgbjs gluon densities ccfm equations. saturation impede frac partons transversal saturation call liberation saturation scale. saturation dependence. transversal gluon | non_dup | [] |
24943822 | 10.1007/JHEP11(2013)083 | A general analysis is performed on the dimension-six operators mixing an
almost hidden Z' to the Standard Model (SM), when the Z' communicates with the
SM via heavy mediators. These are fermions charged under both Z' and the SM,
while all SM fermions are neutral under Z'. We classify the operators as a
function of the gauge anomalies behaviour of mediators and explicitly compute
the dimension-six operators coupling Z' to gluons, generated at one-loop by
chiral but anomaly-free, sets of fermion mediators. We prove that only one
operator contribute to the couplings between Z' charged matter and on-shell
gluons. We then make a complete phenomenological analysis of the scenario where
the lightest fermion charged under Z' is the dark matter candidate. Combining
results from WMAP/PLANCK data, mono-jet searches at LHC, and direct/indirect
dark matter detections restrict considerably the allowed parameter space.Comment: 40 pages, 11 figure | Extra U(1), effective operators, anomalies and dark matter | extra u(1), effective operators, anomalies and dark matter | hidden communicates mediators. fermions fermions neutral classify anomalies mediators explicitly gluons chiral anomaly fermion mediators. couplings gluons. phenomenological lightest fermion candidate. combining wmap planck mono searches indirect detections restrict considerably pages | non_dup | [] |
24945184 | 10.1007/JHEP11(2013)086 | We show that holographic RG flow can be defined precisely such that it
corresponds to emergence of spacetime. We consider the case of pure Einstein's
gravity with a negative cosmological constant in the dual hydrodynamic regime.
The holographic RG flow is a system of first order differential equations for
radial evolution of the energy-momentum tensor and the variables which
parametrize it's phenomenological form on hypersurfaces in a foliation. The RG
flow can be constructed without explicit knowledge of the bulk metric provided
the hypersurface foliation is of a special kind. The bulk metric can be
reconstructed once the RG flow equations are solved. We show that the full
spacetime can be determined from the RG flow by requiring that the horizon
fluid is a fixed point in a certain scaling limit leading to the
non-relativistic incompressible Navier-Stokes dynamics. This restricts the
near-horizon forms of all transport coefficients, which are thus determined
independently of their asymptotic values and the RG flow can be solved
uniquely. We are therefore able to recover the known boundary values of almost
all transport coefficients at the first and second orders in the derivative
expansion. We conjecture that the complete characterisation of the general
holographic RG flow, including the choice of counterterms, might be determined
from the hydrodynamic regime.Comment: 61 pages, 2 figures, 5 tables; matches with JHEP versio | Spacetime emergence via holographic RG flow from incompressible
Navier-Stokes at the horizon | spacetime emergence via holographic rg flow from incompressible navier-stokes at the horizon | holographic precisely emergence spacetime. einstein cosmological hydrodynamic regime. holographic parametrize phenomenological hypersurfaces foliation. hypersurface foliation kind. reconstructed solved. spacetime requiring horizon relativistic incompressible navier stokes dynamics. restricts horizon independently asymptotic solved uniquely. recover orders expansion. conjecture characterisation holographic counterterms hydrodynamic pages tables matches jhep versio | non_dup | [] |
24961299 | 10.1007/JHEP11(2013)087 | We build a holographic superconductor model with a scalar triplet charged
under an SU(2) gauge field in the bulk. In this model, the s-wave and p-wave
condensates can be consistently realized. We find that there are totally four
phases in this model, namely, the normal phase without any condensate, s-wave
phase, p-wave phase and the s+p coexisting phase. By calculating Gibbs free
energy, the s+p coexisting phase turns out to be thermodynamically favored once
it can appear. The phase diagram with the dimension of the scalar operator and
temperature is drawn. The temperature range for the s+p coexisting phase is
very narrow, which shows the competition between the s-wave and p-wave orders
in the superconductor model.Comment: 14 pages, 8 figure | Competition between the s-wave and p-wave superconductivity phases in a
holographic model | competition between the s-wave and p-wave superconductivity phases in a holographic model | build holographic superconductor triplet bulk. condensates consistently realized. totally condensate coexisting phase. calculating gibbs coexisting turns thermodynamically favored appear. drawn. coexisting narrow competition orders superconductor pages | non_dup | [] |
24949401 | 10.1007/JHEP11(2013)090 | 5D supergravity generically has non-geometric moduli other than the radion
that belong to 5D vector multiplets. We summarize the impacts of such moduli on
4D effective theory of 5D supergravity on S^1/Z_2. We mainly discuss the
structure of the effective Kahler potential including the one-loop quantum
corrections. As an illustrative example, we construct a model in which the size
of the extra dimension is stabilized at an exponentially large value compared
to the Planck length, which is similar to the LARGE volume scenario in string
theory.Comment: 25 pages, v2: typos corrected, v3: typos correcte | Impacts of non-geometric moduli on effective theory of 5D supergravity | impacts of non-geometric moduli on effective theory of 5d supergravity | supergravity generically geometric moduli radion belong multiplets. summarize impacts moduli supergravity kahler corrections. illustrative extra stabilized exponentially planck pages typos corrected typos correcte | non_dup | [] |
19535935 | 10.1007/JHEP11(2013)092 | The first observation of the decay B0s→ϕK¯¯¯∗0 is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions at s√=7 TeV, collected with the LHCb detector. A yield of 30 ± 6 B0s→(K+K−)(K−π+) decays is found in the mass windows 1012.5 < M (K + K −) < 1026.5 MeV/c 2 and 746 < M(K − π +) < 1046 MeV/c 2. The signal yield is found to be dominated by B0s→ϕK¯¯¯∗0 decays, and the corresponding branching fraction is measured to be B(B0s→ϕK¯¯¯∗0) = (1.10 ± 0.24 (stat) ± 0.14 (syst) ± 0.08 (f d /f s )) × 10−6, where the uncertainties are statistical, systematic and from the ratio of fragmentation fractions f d /f s which accounts for the different production rate of B 0 and B0s mesons. The significance of B0s→ϕK¯¯¯∗0 signal is 6.1 standard deviations. The fraction of longitudinal polarization in B0s→ϕK¯¯¯∗0 decays is found to be f 0 = 0.51 ± 0.15 (stat) ± 0.07 (syst) | First observation of the decay B0s→φK¯∗0 | first observation of the decay b0s→φk¯∗0 | s→ϕk¯¯¯∗ reported. luminosity collisions lhcb detector. decays windows dominated s→ϕk¯¯¯∗ decays branching s→ϕk¯¯¯∗ stat syst fragmentation fractions accounts mesons. s→ϕk¯¯¯∗ deviations. longitudinal s→ϕk¯¯¯∗ decays stat syst | non_dup | [] |
24943482 | 10.1007/JHEP11(2013)093 | (0,2) gauged linear sigma models with torsion, corresponding to principal
torus bundles over warped CY bases, provide a useful framework for getting
exact statements about perturbative dualities in the presence of fluxes. In
this context we first study dualities mapping the torus fiber onto itself,
implying the existence of quantization constraints on the torus moduli for
consistency. Second, we investigate dualities mixing the principal torus bundle
with the gauge bundle, relating the torsional GLSMs to ordinary ones
corresponding to CY compactifications with non-standard embeddings, namely two
classes of models with different target-space topologies.Comment: 27 pages. Version 2 : significant changes in section 4. Version 3 :
few improvements in the text, published version. Version 4 : few typos
corrected and clarification | T-Duality in Gauged Linear Sigma-Models with Torsion | t-duality in gauged linear sigma-models with torsion | gauged sigma torsion principal torus bundles warped bases getting statements perturbative dualities fluxes. dualities torus fiber implying quantization torus moduli consistency. dualities principal torus bundle bundle relating torsional glsms ordinary compactifications embeddings pages. improvements version. typos corrected clarification | non_dup | [] |
24951740 | 10.1007/JHEP11(2013)097 | We refine the implementation of ensemble fermions for the electroweak sector
of the Standard Model, introduced previously. We consider the behavior of
different observables as the size of the ensemble is increased and show that
the dynamics converges for ensemble sizes small enough that simulations of the
entire electroweak sector become numerically tractable. We apply the method to
the computation of the effective preheating temperature during a fast
electroweak transition, relevant for Cold Electroweak Baryogenesis. We find
that this temperature is never below 20 GeV, and this in combination with the
early results convincingly rules out Standard Model CP-violation as the origin
of the baryon asymmetry of the Universe.Comment: 19 pages, 10 figure | Ensemble fermions for electroweak dynamics and the fermion preheating
temperature | ensemble fermions for electroweak dynamics and the fermion preheating temperature | refine ensemble fermions electroweak previously. observables ensemble converges ensemble sizes electroweak numerically tractable. preheating electroweak cold electroweak baryogenesis. never convincingly violation baryon asymmetry pages | non_dup | [] |
24964087 | 10.1007/JHEP11(2013)103 | We consider supersymmetric gauge theories on round 3-sphere with a certain
background gauge field. The Lagrangians break the usual symmetry because the
background gauge field which we have turned on violates the isometry. In order
to maintain the supersymmetry, we choose unfamiliar charged Killing spinors as
N = 2 SUSY parameters. We perform localization calculous within this setup and
find the double sine function as we expected. We comment on more direct
relationship between theories on round sphere and squashed sphere via Weyl
transformation.Comment: 17 pages. Weyl rescaling and Wilson loop discussions added. reference
adde | Localization on round sphere revisited | localization on round sphere revisited | supersymmetric round sphere field. lagrangians break usual turned violates isometry. maintain supersymmetry unfamiliar killing spinors susy parameters. localization calculous setup sine expected. comment round sphere squashed sphere weyl pages. weyl rescaling wilson discussions added. adde | non_dup | [] |
24942638 | 10.1007/JHEP11(2013)104 | We show that the number of supersymmetries of IIB black hole horizons is N=2
N_- + 2 index(D_\lambda), where index(D_\lambda) is the index of the Dirac
operator twisted with the line bundle \lambda^{1/2} of IIB scalars, and N_- is
the dimension of the kernel of a horizon Dirac operator which depends on IIB
fluxes. Therefore, all IIB horizons preserve an even number of supersymmetries.
In addition if the horizons have non-trivial fluxes and N_- is nonzero, then
index(D_\lambda) is non-negative, and the horizons admit an sl(2,R) symmetry
subalgebra. This provides evidence that all such horizons have an AdS/CFT dual.
Furthermore if the orbits of sl(2,R) are two-dimensional, the IIB horizons are
warped products AdS_2 X S.Comment: 37 pages, late | Index theory and dynamical symmetry enhancement near IIB horizons | index theory and dynamical symmetry enhancement near iib horizons | supersymmetries horizons lambda lambda dirac twisted bundle lambda scalars kernel horizon dirac fluxes. horizons preserve supersymmetries. horizons trivial fluxes nonzero lambda horizons admit subalgebra. horizons dual. orbits horizons warped pages | non_dup | [] |
24939802 | 10.1007/JHEP11(2013)107 | Using the gauge/gravity duality we study the imaginary part of the static
potential associated to the thermal width in finite temperature strongly
coupled anisotropic plasma. We firstly derive the potential for a generic
anisotropic background. Then we apply our formulas to a theory where the
anisotropy has been generated by a space dependent axion term. We find that
using our method there exist a peculiar turning point in the imaginary part of
the potential, similar to the one appearing in the real part. The presence of
anisotropy leads to decrease of the imaginary potential, where larger decrease
happens along the anisotropic direction when the temperature is kept fixed.
When the entropy density is fixed, increase happens along the parallel
direction while along the transverse plane we observe a decrease. To estimate
the thermal width we use an approximate extrapolation beyond the turning point
and we find a decrease in presence of the anisotropy, independently of the
comparison scheme used.Comment: 20+4 pages, 15 figures, v2: version published in JHE | The Imaginary Part of the Static Potential in Strongly Coupled
Anisotropic Plasma | the imaginary part of the static potential in strongly coupled anisotropic plasma | duality imaginary anisotropic plasma. firstly derive generic anisotropic background. formulas anisotropy axion term. peculiar turning imaginary appearing part. anisotropy imaginary happens anisotropic kept fixed. happens decrease. approximate extrapolation turning anisotropy independently pages | non_dup | [] |
24960760 | 10.1007/JHEP11(2013)108 | We propose a simplified light higgsino-singlino scenario in the NMSSM, in
which the masses of the chargino and the lightest neutralino determine the
masses and couplings of all 3 lightest neutralinos. This scenario is
complementary to the simplified wino-like chargino/neutralino scenario used
conventionally for the interpretation of results from trilepton searches, and
motivated by lower bounds on the gluino mass in the case of GUT relations
between the wino and gluino masses. We present all masses and mixing angles
necessary for the determination of production cross sections of the chargino
and the 3 neutralinos in the form of Tables in the M_{neutralino_1} -
M_{chargino_1} plane, assuming Higgs mass motivated values for tan(beta)=2 and
lambda=0.6. We show that this scenario leads to considerable signal rates, and
present constraints in this plane from recent searches for trileptons at the
LHC.Comment: 16 pages, 1 Figure, 8 Table | Testing the higgsino-singlino sector of the NMSSM with trileptons at the
LHC | testing the higgsino-singlino sector of the nmssm with trileptons at the lhc | propose simplified higgsino singlino nmssm chargino lightest neutralino couplings lightest neutralinos. complementary simplified wino chargino neutralino conventionally trilepton searches motivated bounds gluino wino gluino masses. angles chargino neutralinos tables neutralino chargino motivated beta lambda considerable searches trileptons pages | non_dup | [] |
24974968 | 10.1007/JHEP11(2013)109 | We implement quantum corrections for a magnetic monopole in a classically
conformally invariant theory containing gravity. This yields the trace
(conformal) anomaly and introduces a length scale in a natural fashion via the
process of renormalization. We evaluate the one-loop effective potential and
extract the vacuum expectation value (VEV) from it; spontaneous symmetry
breaking is radiatively induced. The VEV is set at the renormalization scale
$M$ and we exchange the dimensionless scalar coupling constant for the
dimensionful VEV via dimensional transmutation. The asymptotic (background)
spacetime is anti-de Sitter (AdS) and its Ricci scalar is determined entirely
by the VEV. We obtain analytical asymptotic solutions to the coupled set of
equations governing gravitational, gauge and scalar fields that yield the
magnetic monopole in an AdS spacetime.Comment: 18 pages, one figure, to appear in JHE | Radiatively induced symmetry breaking and the conformally coupled
magnetic monopole in AdS space | radiatively induced symmetry breaking and the conformally coupled magnetic monopole in ads space | implement monopole classically conformally gravity. trace conformal anomaly introduces fashion renormalization. extract expectation spontaneous breaking radiatively induced. renormalization dimensionless dimensionful transmutation. asymptotic spacetime sitter ricci entirely vev. asymptotic governing gravitational monopole pages | non_dup | [] |
24982864 | 10.1007/JHEP11(2013)110 | The G/G WZW model results from the WZW-model by a standard procedure of
gauging. G/G WZW models are members of Dirac sigma models, which also contain
twisted Poisson sigma models as other examples. We show how the general class
of Dirac sigma models can be obtained from a gauging procedure adapted to Lie
algebroids in the form of an equivariantly closed extension. The rigid gauge
groups are generically infinite dimensional and a standard gauging procedure
would give a likewise infinite number of 1-form gauge fields; the proposed
construction yields the requested finite number of them.
Although physics terminology is used, the presentation is kept accessible
also for a mathematical audience.Comment: 20 pages, 3 figure | Dirac Sigma Models from Gauging | dirac sigma models from gauging | gauging. dirac sigma twisted poisson sigma examples. dirac sigma gauging adapted algebroids equivariantly extension. rigid generically infinite gauging likewise infinite requested them. terminology presentation kept accessible mathematical pages | non_dup | [] |
24952882 | 10.1007/JHEP11(2013)112 | We use mirror symmetry, the refined holomorphic anomaly equation and
modularity properties of elliptic singularities to calculate the refined BPS
invariants of stable pairs on non-compact Calabi-Yau manifolds, based on del
Pezzo surfaces and elliptic surfaces, in particular the half K3. The BPS
numbers contribute naturally to the five-dimensional N=1 supersymmetric index
of M-theory, but they can be also interpreted in terms of the superconformal
index in six dimensions and upon dimensional reduction the generating functions
count N=2 Seiberg-Witten gauge theory instantons in four dimensions. Using the
M/F-theory uplift the additional information encoded in the spin content can be
used in an essential way to obtain information about BPS states in physical
systems associated to small instantons, tensionless strings, gauge symmetry
enhancement in F-theory by [p,q]-strings as well as M-strings.Comment: 120 pages, 21 figure | Refined stable pair invariants for E-, M- and [p,q]-strings | refined stable pair invariants for e-, m- and [p,q]-strings | mirror refined holomorphic anomaly modularity elliptic singularities refined invariants calabi manifolds pezzo elliptic naturally supersymmetric interpreted superconformal generating count seiberg witten instantons dimensions. uplift encoded instantons tensionless strings enhancement strings pages | non_dup | [] |
24937944 | 10.1007/JHEP11(2013)113 | It is observed that the (intersecting) branes of M/string theory, which are
known to give AdS geometry (directly or upto a conformal transformation) in the
near horizon limit, do also lead to Schr\" odinger/Lifshitz dual space-times
(without or with hyperscaling violation) upon using appropriate solution
generating transformation and dimensional reduction. We show that the dynamical
exponents of the Schr\" odinger and the Lifshitz space-times obtained in this
way always add upto 2. We illustrate this by several examples, including M2-,
M5-branes of M-theory and D$(p+1)$-branes ($p\neq 4$, since in this case the
near horizon limit does not give AdS geometry) of string theory as well as many
of their intersecting solutions. The Schr\" odinger space-time can be obtained
by the standard wave generating technique along one of the brane directions
(for single brane) or one of the common brane directions (for intersecting
branes) and then interchanging the light-cone coordinates by double Wick
rotations, whereas, the Lifshitz space-time can be obtained by dimensionally
reducing (for M-theory) along the wave direction or taking T-duality (for
string theory) along the same direction. We thus obtain Schr\" odinger/Lifshitz
dual space-times without or with hyperscaling violation from the same M/string
theory solutions and they preserve some fraction of the supersymmetry.Comment: 30 pages, no figures; v2: typos corrected, added references, added
acknowledgement; v3: added more references, acknowledgement and a note, added
more clarifications, version to appear in JHE | From AdS to Schr\"odinger/Lifshitz dual space-times without or with
hyperscaling violation | from ads to schr\"odinger/lifshitz dual space-times without or with hyperscaling violation | intersecting branes upto conformal horizon schr odinger lifshitz hyperscaling violation generating reduction. exponents schr odinger lifshitz upto illustrate branes branes horizon intersecting solutions. schr odinger generating brane directions brane brane directions intersecting branes interchanging cone wick rotations lifshitz dimensionally reducing duality direction. schr odinger lifshitz hyperscaling violation preserve pages typos corrected acknowledgement acknowledgement clarifications | non_dup | [] |
24962298 | 10.1007/JHEP11(2013)117 | We study the correlation function of two circular Wilson loops at strong
coupling in N=4 super Yang-Mills theory. Using the AdS/CFT correspondence, the
problem maps to finding the minimal surface between two circles defined on the
boundary of AdS, and the fluctuations around the classical solution in AdS_5 x
S^5. At the classical level, we derive the string solution in H_3 x S^1
explicitly, and focus on properties such as stability and phase transition.
Furthermore, a computation of the associated algebraic curve is given. At the
quantum level, the one-loop partition function is constructed by introducing
quadratic bosonic and fermionic fluctuations around the classical solution,
embedded in AdS_5 x S^5. We find an analytic, formal expression for the
partition function in terms of an infinite product by employing the
Gel'fand-Yaglom method and supersymmetric regularization. We regulate the
expression and evaluate the partition function numerically.Comment: 44 pages, 14 figures. v2: references adde | Correlation Function of Circular Wilson Loops at Strong Coupling | correlation function of circular wilson loops at strong coupling | circular wilson loops super mills theory. correspondence circles derive explicitly transition. algebraic given. partition introducing quadratic bosonic fermionic embedded analytic formal partition infinite employing fand yaglom supersymmetric regularization. regulate partition pages figures. adde | non_dup | [] |
24948176 | 10.1007/JHEP11(2013)119 | The Unruh effect refers to the thermal fluctuations a detector experiences
while undergoing linear motion with uniform acceleration in a Minkowski vacuum.
This thermality can be demonstrated by tracing the vacuum state of the field
over the modes beyond the accelerated detector's event horizon. However, the
event horizon is well-defined only if the detector moves with eternal uniform
linear acceleration. This idealized condition cannot be fulfilled in realistic
situations when the motion unavoidably involves periods of non-uniform
acceleration. Many experimental proposals to test the Unruh effect are of this
nature. Often circular or oscillatory motion, which lacks an obvious geometric
description, is considered in such proposals. The proper perspective for
theoretically going beyond, or experimentally testing, the Unruh-Hawking effect
in these more general conditions has to be offered by concepts and techniques
in non-equilibrium quantum field theory. In this paper we provide a detailed
analysis of how an Unruh-DeWitt detector undergoing oscillatory motion responds
to the fluctuations of a quantum field. Numerical results for the late-time
temperatures of the oscillating detector are presented. We comment on the
digressions of these results from what one would obtain from a naive
application of Unruh's result.Comment: 23 pages, 11 figures. Minor revision, new references adde | Unruh Effect under Non-equilibrium conditions: Oscillatory motion of an
Unruh-DeWitt detector | unruh effect under non-equilibrium conditions: oscillatory motion of an unruh-dewitt detector | unruh refers experiences undergoing acceleration minkowski vacuum. thermality tracing accelerated horizon. horizon moves eternal acceleration. idealized fulfilled realistic situations unavoidably involves acceleration. proposals unruh nature. circular oscillatory lacks obvious geometric proposals. proper perspective theoretically going experimentally unruh hawking offered concepts theory. unruh dewitt undergoing oscillatory responds field. oscillating presented. comment digressions naive unruh pages figures. minor revision adde | non_dup | [] |
33069288 | 10.1007/JHEP11(2013)120 | The vector channel spectral function and the dilepton production rate from a QCD plasma at a temperature above a few hundred MeV are evaluated up to next-to-leading order (NLO) including their dependence on a non-zero momentum with respect to the heat bath. The invariant mass of the virtual photon is taken to be in the range K2 ~ (πT)2 ~ (1GeV)2, generalizing previous NLO results valid for K2 ≫ (πT)2. In the opposite regime 0 < K2 ≪ (πT)2 the loop expansion breaks down, but agrees nevertheless in order of magnitude with a previous result obtained through resummations. Ways to test the vector spectral function through comparisons with imaginary-time correlators measured on the lattice are discussed | NLO thermal dilepton rate at non-zero momentum | nlo thermal dilepton rate at non-zero momentum | dilepton hundred bath. virtual generalizing valid opposite breaks agrees nevertheless resummations. ways comparisons imaginary correlators | non_dup | [] |
24768168 | 10.1007/JHEP11(2013)121 | We investigate the entanglement between individual field theory modes in
finite-density systems of interacting relativistic and non-relativistic
fermions in one spatial dimension. We calculate the entanglement entropy for a
single field theory mode and the mutual information between any two modes. The
calculation is perturbative in the four-fermion (two-body) coupling, with the
leading contribution at order lambda^2 log(lambda^2). At this leading order,
the perturbative expression for the entanglement entropy of a mode diverges
logarithmically as the momentum of the mode approaches the Fermi surface from
above or below. The mutual information between modes is largest for pairs of
modes just above and below the Fermi momentum. The entanglement properties of
modes near the Fermi surface are qualitatively the same if the field theory is
cut off to eliminate modes away from the Fermi surface.Comment: 19 pages, LaTeX, 7 figure | Momentum-space entanglement for interacting fermions at finite density | momentum-space entanglement for interacting fermions at finite density | entanglement interacting relativistic relativistic fermions dimension. entanglement mutual modes. perturbative fermion lambda lambda perturbative entanglement diverges logarithmically fermi below. mutual fermi momentum. entanglement fermi qualitatively eliminate away fermi pages latex | non_dup | [] |
24958335 | 10.1007/JHEP11(2013)122 | We investigate the physical properties of the de Sitter spacetime and new
type-de Sitter black holes in new massive gravity, a higher derivative gravity
theory in three dimensions. We calculate thermodynamic quantities and check
that the first law of thermodynamics is satisfied. In particular, we obtain the
energies of the de Sitter spacetime and new type-de Sitter black holes from the
renormalized Brown-York boundary stress tensor on the Euclidean surfaces at
late temporal infinity. We also obtain the quasinormal modes and by using them
we find that the entropy spectra are equally spaced via semi-classical
quantization.Comment: 19 pages, 1 figure, some minor corrections, to appear in JHE | Some properties of the de Sitter black holes in three dimensional
spacetime | some properties of the de sitter black holes in three dimensional spacetime | sitter spacetime sitter holes massive dimensions. thermodynamic quantities check thermodynamics satisfied. sitter spacetime sitter holes renormalized brown euclidean infinity. quasinormal equally spaced pages minor | non_dup | [] |
24950464 | 10.1007/JHEP11(2013)123 | We investigate epsilon-deformed N=2 superconformal gauge theories in four
dimensions, focusing on the N=2* and Nf=4 SU(2) cases. We show how the modular
anomaly equation obeyed by the deformed prepotential can be efficiently used to
derive its non-perturbative expression starting from the perturbative one. We
also show that the modular anomaly equation implies that S-duality is
implemented by means of an exact Fourier transform even for arbitrary values of
the deformation parameters, and then we argue that it is possible,
perturbatively in the deformation, to choose appropriate variables such that it
reduces to a Legendre transform.Comment: 30 pages, LeTeX2e. V2: references added, appendix B expanded, a few
typos correcte | Modular anomaly equation, heat kernel and S-duality in N=2 theories | modular anomaly equation, heat kernel and s-duality in n=2 theories | epsilon deformed superconformal focusing cases. modular anomaly obeyed deformed prepotential efficiently derive perturbative perturbative one. modular anomaly duality implemented fourier transform deformation argue perturbatively deformation reduces legendre pages letex expanded typos correcte | non_dup | [] |
24937018 | 10.1007/JHEP11(2013)124 | Vertex operators in string theory come in two varieties: integrated and
unintegrated. Understanding both types is important for the calculation of the
string theory amplitudes. The relation between them is a descent procedure
typically involving the b-ghost. In the pure spinor formalism vertex operators
can be identified as cohomology classes of an infinite-dimensional Lie
superalgebra formed by covariant derivatives. We show that in this language the
construction of the integrated vertex from an unintegrated vertex is very
straightforward, and amounts to the evaluation of the cocycle on the
generalized Lax currents.Comment: LaTeX 13pp; v2: correction in Section 4. | A construction of integrated vertex operator in the pure spinor
sigma-model in AdS5xS5 | a construction of integrated vertex operator in the pure spinor sigma-model in ads5xs5 | come varieties unintegrated. amplitudes. descent involving ghost. spinor formalism cohomology infinite superalgebra covariant derivatives. unintegrated straightforward amounts cocycle latex | non_dup | [] |
24951905 | 10.1007/JHEP11(2013)125 | F-theory SU(5) unification has been proposed as a scenario where the mass of
the top quark is naturally large, as opposed to type II SU(5) models. We
analyze this claim from the viewpoint of local SU(5) F-theory models, by
explicitly computing the 10 x 10 x 5 Yukawa couplings that are developed in the
vicinity of an E6 singularity. Realizing this singularity via T-branes allows
for a non-trivial mass for the top quark, while lighter generations of up-type
quarks still have vanishing Yukawa couplings. Nevertheless, we show that by
taking instanton effects into account non-vanishing Yukawas are induced for all
U-quark families, together with a hierarchical structure at the level of the
superpotential. Finally, by solving for internal wavefunction profiles we
compute physical U-quark Yukawa couplings and show that this F-theory scenario
allows to describe the measured top quark mass, as well as the observed
quotients of U-quark masses.Comment: 48 pages + appendices, 1 figur | Up-type quark masses in SU(5) F-theory models | up-type quark masses in su(5) f-theory models | unification naturally opposed models. analyze claim viewpoint explicitly yukawa couplings vicinity singularity. realizing singularity branes trivial lighter generations quarks vanishing yukawa couplings. nevertheless instanton vanishing yukawas families hierarchical superpotential. solving wavefunction yukawa couplings quotients pages appendices figur | non_dup | [] |
24968344 | 10.1007/JHEP11(2013)126 | The eikonal operator was originally introduced to describe the effect of
tidal excitations on higher-genus elastic string amplitudes at high energy. In
this paper we provide a precise interpretation for this operator through the
explicit tree-level calculation of generic inelastic transitions between closed
strings as they scatter off a stack of parallel Dp-branes. We perform this
analysis both in the light-cone gauge, using the Green-Schwarz vertex, and in
the covariant formalism, using the Reggeon vertex operator. We also present a
detailed discussion of the high energy behaviour of the covariant string
amplitudes, showing how to take into account the energy factors that enhance
the contribution of the longitudinally polarized massive states in a simple
way.Comment: 58 page | Microscopic unitary description of tidal excitations in high-energy
string-brane collisions | microscopic unitary description of tidal excitations in high-energy string-brane collisions | eikonal originally tidal excitations genus elastic amplitudes energy. precise generic inelastic strings scatter stack branes. cone schwarz covariant formalism reggeon operator. covariant amplitudes enhance longitudinally polarized massive | non_dup | [] |
24940217 | 10.1007/JHEP11(2013)127 | We construct analytically an asymptotically Lifshitz black brane with
dynamical exponent z=1+epsilon^2 in an Einstein-Proca model, where epsilon is a
small parameter. In previous work we showed that the holographic dual QFT is a
deformation of a CFT by the time component of a vector operator and the
parameter epsilon is the corresponding deformation parameter. In the black
brane background this operator additionally acquires a vacuum expectation
value. We explain how the QFT Ward identity associated with Lifshitz invariance
leads to a conserved mass and compute analytically the thermodynamic quantities
showing that they indeed take the form implied by Lifshitz invariance. In the
second part of the paper we consider top down Lifshitz models with dynamical
exponent close to one and show that they can be understood in terms of vector
deformations of conformal field theories. However, in all known cases, both the
conformal field theory and its Lifshitz deformations have modes that violate
the Breitenlohner-Freedman bound.Comment: 35 page | Lifshitz from AdS at finite temperature and top down models | lifshitz from ads at finite temperature and top down models | analytically asymptotically lifshitz brane exponent epsilon einstein proca epsilon parameter. holographic deformation epsilon deformation parameter. brane additionally acquires expectation value. ward lifshitz invariance conserved analytically thermodynamic quantities implied lifshitz invariance. lifshitz exponent understood deformations conformal theories. conformal lifshitz deformations violate breitenlohner freedman | non_dup | [] |
24961290 | 10.1007/JHEP11(2013)128 | Recently Kashaev, Luo and Vartanov, using the reduction from a
four-dimensional superconformal index to a three-dimensional partition
function, found a pentagon identity for a special combination of hyperbolic
Gamma functions. Following their idea we have obtained a new pentagon identity
for a certain combination of so-called tetrahedron indices arising from the
equality of superconformal indices of dual three-dimensional N=2 supersymmetric
theories and give a mathematical proof of it.Comment: 13 pages, v2: we added a new section with the proof of the identity,
misprints correcte | A new pentagon identity for the tetrahedron index | a new pentagon identity for the tetrahedron index | kashaev vartanov superconformal partition pentagon hyperbolic gamma functions. pentagon tetrahedron indices arising equality superconformal indices supersymmetric mathematical pages misprints correcte | non_dup | [] |
24952356 | 10.1007/JHEP11(2013)129 | The color-flavor locking phenomenon in the magnetic picture can be the
microscopic description of the quark confinement in QCD. We demonstrate it in
an N=2 supersymmetric SU(Nc)xSU(Nc) quiver gauge theory coupled to Nf flavors
of quarks (Nf<Nc). This model reduces to SU(Nc) gauge theory with Nf flavors
when the vacuum expectations value of the link field is much larger than the
dynamical scales, and thus provides a continuous deformation of the N=2
supersymmetric QCD. We study a vacuum which survives upon adding a
superpotential term to reduce to N=1 while preserving the vectorial SU(Nf)
flavor symmetry. We find a region of the parameter space where the confinement
is described by the Higgsing of a weakly coupled magnetic SU(Nf)xU(1) gauge
theory. The Higgsing locks the quantum numbers of SU(Nf) magnetic color to
those of SU(Nf) flavor symmetry, and thus the massive magnetic gauge bosons
become the singlet and adjoint representations of the flavor group, i.e, the
vector mesons. If the qualitative picture remains valid in non-supersymmetric
QCD, one can understand the Hidden Local Symmetry as the magnetic dual
description of QCD, and the confining string is identified as the vortex of
vector meson fields.Comment: 23 pages, 1 figure, typos corrected, a reference adde | Quark confinement via magnetic color-flavor locking | quark confinement via magnetic color-flavor locking | flavor locking phenomenon picture microscopic confinement qcd. supersymmetric quiver flavors quarks reduces flavors expectations deformation supersymmetric qcd. survives adding superpotential preserving vectorial flavor symmetry. confinement higgsing weakly theory. higgsing locks flavor massive bosons singlet adjoint representations flavor mesons. qualitative picture valid supersymmetric hidden confining vortex meson pages typos corrected adde | non_dup | [] |
24960099 | 10.1007/JHEP11(2013)130 | Using exact results obtained from localization on S^4, we explore the large N
limit of N=2 super-Yang-Mills theories with massive matter multiplets. We focus
on three cases: N=2* theory, describing a massive hypermultiplet in the adjoint
representation, SU(N) super-Yang-Mills with 2N massive hypermultiplets in the
fundamental, and super-QCD with massive quarks. When the radius of the
four-sphere is sent to infinity the theories at hand are described by solvable
matrix models, which exhibit a number of interesting phenomena including
quantum phase transitions at finite 't Hooft coupling.Comment: 52 pages, 12 figure | Massive N=2 Gauge Theories at Large N | massive n=2 gauge theories at large n | localization explore super mills massive multiplets. describing massive hypermultiplet adjoint super mills massive hypermultiplets super massive quarks. sphere sent infinity solvable exhibit phenomena hooft pages | non_dup | [] |
24967699 | 10.1007/JHEP11(2013)131 | There exist tree-level generalizations of the Type-I and Type-III seesaw
mechanisms that realize neutrino mass via low-energy effective operators with
d>5. However, these generalizations also give radiative masses that can
dominate the seesaw masses in regions of parameter space --- i.e. they are not
purely seesaw models, nor are they purely radiative models, but instead they
are something in between. A recent work detailed the remaining minimal models
of this type. Here we study the remaining model with d=9 and investigate the
collider phenomenology of the exotic quadruplet fermions it predicts. These
exotics can be pair produced at the LHC via electroweak interactions and their
subsequent decays produce a host of multi-lepton signals. Furthermore, the
branching fractions for events with distinct charged-leptons encode information
about both the neutrino mass hierarchy and the leptonic mixing phases. In large
regions of parameter-space discovery at the LHC with a 5 sigma significance is
viable for masses approaching the TeV scale.Comment: v3 supersedes JHEP version; corrects typo's and a basic error
(erroneously placed matrix elements in Eq. 22 | Probing Exotic Fermions from a Seesaw/Radiative Model at the LHC | probing exotic fermions from a seesaw/radiative model at the lhc | generalizations seesaw realize generalizations radiative dominate seesaw i.e. purely seesaw purely radiative something between. type. collider phenomenology exotic quadruplet fermions predicts. exotics electroweak decays lepton signals. branching fractions leptons encode hierarchy leptonic phases. discovery sigma viable approaching supersedes jhep corrects typo erroneously placed | non_dup | [] |
24957544 | 10.1007/JHEP11(2013)133 | We discuss a phase transition of a Reissner-Nordstr\"om black hole to a hairy
black hole in asymptotically flat spacetime. The hair is due to a massive
charged scalar field. The no-hair theorem is evaded thanks to a derivative
coupling of the scalar field to the Einstein tensor. The resulting hairy
configuration is spherically symmetric. We solve the equations analytically
near the transition temperature and show that the hair is concentrated near the
horizon decaying exponentially away from it.Comment: v2: 17 pages, 6 figures (corrected) - JHEP versio | Phase Transition to a Hairy Black Hole in Asymptotically Flat Spacetime | phase transition to a hairy black hole in asymptotically flat spacetime | reissner nordstr hairy asymptotically spacetime. hair massive field. hair evaded thanks einstein tensor. hairy spherically symmetric. solve analytically hair concentrated horizon decaying exponentially away pages corrected jhep versio | non_dup | [] |
24963147 | 10.1007/JHEP11(2013)134 | We revisit and clarify the supersymmetric versions of $R+ R^2$ gravity, in
view of the renewed interest to these models in cosmology. We emphasize that
the content of the dual standard supergravity theory in the old minimal
formulation necessarily includes two massive chiral multiplets, that we call
the inflaton and the goldstino. We point out that the presence of these
multiplets is model independent in the old minimal formulation and therefore
any theory that contains a single chiral multiplet fails to be a supersymmetric
generalization of the $R+R^2$ gravity. The supergravity interactions of the two
chiral multiplets are encoded in a superpotential mass term and an arbitrary
Kahler potential for the goldstino multiplet. The implication for cosmology of
the supersymmetric $R+R^2$ gravity is also discussed.Comment: 11 pages; accepted for publication in JHEP; v2: typos corrected in
(3.17) and in discussio | On the Supersymmetric Completion of $R+R^2$ Gravity and Cosmology | on the supersymmetric completion of $r+r^2$ gravity and cosmology | revisit clarify supersymmetric versions renewed cosmology. emphasize supergravity formulation necessarily massive chiral multiplets call inflaton goldstino. multiplets formulation chiral multiplet fails supersymmetric generalization gravity. supergravity chiral multiplets encoded superpotential kahler goldstino multiplet. implication cosmology supersymmetric pages publication jhep typos corrected discussio | non_dup | [] |
24951751 | 10.1007/JHEP11(2013)136 | The propagation of a probe electromagnetic field through a counterpropagating
strong plane wave is investigated. The effects of the electromagnetic
field-(pseudo)scalar axion field interaction and of the self-interaction of the
electromagnetic field mediated by virtual electron-positron pairs in the
effective Lagrangian approach are included. First, we show that if the strong
field is circularly polarized, contrary to the leading-order nonlinear QED
effects, the axion-photon interaction induces a chiral-like birefringence and a
dichroism in the vacuum. The latter effect is explained by evoking the
conservation of the total angular momentum along the common propagation
direction of probe and the strong wave, which allows for real axion production
only for probe and strong fields with the same helicity. Moreover, in the case
of ultra-short strong pulses, it is shown that the absorption coefficients of
probe photons depend on the form of the pulse and, in particular, on the
carrier-envelope phase of the strong beam. The present results can be exploited
experimentally to isolate nonlinear vacuum effects stemming from light-axion
interaction, especially at upcoming ultra-strong laser facilities, where
stringent constraints on the axion-photon coupling constant are in principle
provided.Comment: 16 pages, 1 figur | Axion-induced birefringence effects in laser driven nonlinear vacuum
interaction | axion-induced birefringence effects in laser driven nonlinear vacuum interaction | propagation electromagnetic counterpropagating investigated. electromagnetic pseudo axion electromagnetic virtual positron lagrangian included. circularly polarized contrary axion induces chiral birefringence dichroism vacuum. evoking conservation propagation axion helicity. ultra pulses photons carrier envelope beam. exploited experimentally isolate stemming axion upcoming ultra facilities stringent axion pages figur | non_dup | [] |
24968699 | 10.1007/JHEP11(2013)137 | A new dynamic SU(3)-structure solution in type-IIA is found by T-dualising a
deformation of the Maldacena-Nastase solution along an SU(2) isometry. It is
argued that this is dual to a quiver gauge theory with multiple Chern-Simons
levels. A clear way of defining Chern-Simons levels in terms of Page charges is
presented, which is also used to define a Chern-Simons term for the
G2-structure analogue of Klebanov-Strassler, providing evidence of a cascade in
both the ranks and levels of the dual quiver.Comment: 29 pages. v2 - minor corrections and references added, version to
appear in JHE | non-Abelian T-duality, G2-structure Rotation and Holographic Duals of
N=1 Chern-Simons Theories | non-abelian t-duality, g2-structure rotation and holographic duals of n=1 chern-simons theories | dualising deformation maldacena nastase isometry. argued quiver chern simons levels. defining chern simons charges chern simons analogue klebanov strassler cascade ranks pages. minor | non_dup | [] |
24943413 | 10.1007/JHEP11(2013)138 | In this work we have investigated some properties of classical phase-space
with symplectic structures consistent, at the classical level, with two
noncommutative (NC) algebras: the Doplicher-Fredenhagen-Roberts algebraic
relations and the NC approach which uses an extended Hilbert space with
rotational symmetry. This extended Hilbert space includes the operators
$\theta^{ij}$ and their conjugate momentum $\pi_{ij}$ operators. In this
scenario, the equations of motion for all extended phase-space coordinates with
their corresponding solutions were determined and a rotational invariant NC
Newton's second law was written. As an application, we treated a NC harmonic
oscillator constructed in this extended Hilbert space. We have showed precisely
that its solution is still periodic if and only if the ratio between the
frequencies of oscillation is a rational number. We investigated, analytically
and numerically, the solutions of this NC oscillator in a two-dimensional
phase-space. The result led us to conclude that noncommutativity induces a
stable perturbation into the commutative standard oscillator and that the
rotational symmetry is not broken. Besides, we have demonstrated through the
equations of motion that a zero momentum $\pi_{ij}$ originated a constant NC
parameter, namely, $\theta^{ij}=const.$, which changes the original variable
characteristic of $\theta^{ij}$ and reduces the phase-space of the system. This
result shows that the momentum $\pi_{ij}$ is relevant and cannot be neglected
when we have that $\theta^{ij}$ is a coordinate of the system.Comment: 18 pages. JHEP style. Corrections mad | Analytical and numerical analysis of a rotational invariant D=2 harmonic
oscillator in the light of different noncommutative phase-space
configurations | analytical and numerical analysis of a rotational invariant d=2 harmonic oscillator in the light of different noncommutative phase-space configurations | symplectic noncommutative algebras doplicher fredenhagen roberts algebraic hilbert rotational symmetry. hilbert theta conjugate operators. rotational newton written. harmonic oscillator hilbert space. precisely oscillation rational number. analytically numerically oscillator space. noncommutativity induces perturbation commutative oscillator rotational broken. besides originated theta const. theta reduces system. neglected theta coordinate pages. jhep style. | non_dup | [] |
24975243 | 10.1007/JHEP11(2013)139 | The generalized uncertainty principle discloses a self-complete
characteristic of gravity, namely the possibility of masking any curvature
singularity behind an event horizon as a result of matter compression at the
Planck scale. In this paper we extend the above reasoning in order to overcome
some current limitations to the framework, including the absence of a
consistent metric describing such Planck-scale black holes. We implement a
minimum-size black hole in terms of the extremal configuration of a neutral
non-rotating metric, which we derived by mimicking the effects of the
generalized uncertainty principle via a short scale modified version of
Einstein gravity. In such a way, we find a self-consistent scenario that
reconciles the self-complete character of gravity and the generalized
uncertainty principle.Comment: 20 pages, 6 figures, v2: additional references, version in press on
JHE | Self-Completeness and the Generalized Uncertainty Principle | self-completeness and the generalized uncertainty principle | discloses masking curvature singularity behind horizon compression planck scale. extend reasoning overcome limitations describing planck holes. implement extremal neutral rotating mimicking einstein gravity. reconciles character pages | non_dup | [] |
24950950 | 10.1007/JHEP11(2013)141 | The BPS spectrum of certain N=2 supersymmetric field theories can be
determined algebraically by studying the representation theory of BPS quivers.
We introduce methods based on BPS quivers to study line defects. The presence
of a line defect opens up a new BPS sector: framed BPS states can be bound to
the defect. The defect can be geometrically described in terms of laminations
on a curve. To a lamination we associate certain elements of the Leavitt path
algebra of the BPS quiver and use them to compute the framed BPS spectrum. We
also provide an alternative characterization of line defects by introducing
framed BPS quivers. Using the theory of (quantum) cluster algebras, we derive
an algorithm to compute the framed BPS spectra of new defects from known ones.
Line defects are generated from a framed BPS quiver by applying certain
sequences of mutation operations. Framed BPS quivers also behave nicely under a
set of "cut and join" rules, which can be used to study how N=2 systems with
defects couple to produce more complicated ones. We illustrate our formalism
with several examples.Comment: 80 pages, 16 figures; v2: references added, note added, minor
corrections, final version to be published in JHE | Line defects and (framed) BPS quivers | line defects and (framed) bps quivers | supersymmetric algebraically studying quivers. quivers defects. defect opens framed defect. defect geometrically laminations curve. lamination associate leavitt quiver framed spectrum. defects introducing framed quivers. algebras derive framed defects ones. defects framed quiver mutation operations. framed quivers behave nicely join defects couple complicated ones. illustrate formalism pages minor | non_dup | [] |
24970612 | 10.1007/JHEP11(2013)142 | We study finite-temperature N=1 SU(2) super Yang-Mills theory, compactified
on a spatial circle of size L with supersymmetric boundary conditions. In the
semiclassical small-L regime, a deconfinement transition occurs at T_c <<1/L.
The transition is due to a competition between non-perturbative topological
"molecules"---magnetic and neutral bion-instantons---and electrically charged
W-bosons and superpartners. Compared to deconfinement in non-supersymmetric
QCD(adj) arXiv:1112.6389, the novelty is the relevance of the light modulus
scalar field. It mediates interactions between neutral bions (and W-bosons),
serves as an order parameter for the Z_2^{L} center symmetry associated with
the non-thermal circle, and explicitly breaks the electric-magnetic
(Kramers-Wannier) duality enjoyed by non-supersymmetric QCD(adj) near T_c. We
show that deconfinement can be studied using an effective two-dimensional gas
of electric and magnetic charges with (dual) Coulomb and Aharonov-Bohm
interactions, or, equivalently, via an XY-spin model with a symmetry-breaking
perturbation, where each system couples to the scalar field. To study the
realization of the discrete R-symmetry and the Z_2^{beta} thermal and Z_2^{L}
non-thermal center symmetries, we perform Monte Carlo simulations of both
systems. The dual-Coulomb gas simulations are a novel way to analyze
deconfinement and provide a new venue to study the phase structure of a class
of two-dimensional condensed matter models that can be mapped into dual-Coulomb
gases. Our results indicate a continuous deconfinement transition, with Z_2^{L}
remaining unbroken at the transition. Thus, the SYM transition appears similar
to the one in SU(2) QCD(adj) arXiv:1112.6389 and is also likely to be
characterized by continuously varying critical exponents.Comment: 50 pages, 13 figure | Deconfinement in N=1 super Yang-Mills theory on R^3 x S^1 via
dual-Coulomb gas and "affine" XY-model | deconfinement in n=1 super yang-mills theory on r^3 x s^1 via dual-coulomb gas and "affine" xy-model | super mills compactified circle supersymmetric conditions. semiclassical deconfinement competition perturbative topological neutral bion instantons electrically bosons superpartners. deconfinement supersymmetric novelty relevance modulus field. mediates neutral bions bosons serves circle explicitly breaks kramers wannier duality enjoyed supersymmetric deconfinement charges coulomb aharonov bohm equivalently breaking perturbation couples field. realization beta symmetries monte carlo systems. coulomb analyze deconfinement venue condensed mapped coulomb gases. deconfinement unbroken transition. continuously pages | non_dup | [] |
24936145 | 10.1007/JHEP11(2013)144 | The study of discrete gauge symmetries in field theory and string theory is
often carried out by embedding them into continuous symmetries. Many symmetries
however do not seem to admit such embedding, for instance discrete isometries
given by large diffeomorphisms in compactifications. We show that in the
context of string theory even those symmetries can be embedded into continuous
ones. This requires extending the system to a supercritical string theory
configuration with extra dimensions, on which the continuous symmetry acts. The
extra dimensions are subsequently removed by closed string tachyon
condensation, which breaks the continuous symmetry but preserves a discrete
subgroup. The construction is explicit and the tachyon condensation can even be
followed quantitatively for lightlike tachyon profiles. The embedding of
discrete into continuous symmetries allows a realization of charged topological
defects as closed string tachyon solitons, in tantalizing reminiscence of the
construction of D-branes as open tachyon solitons.Comment: 32 pages + appendice | Discrete gauge symmetries from (closed string) tachyon condensation | discrete gauge symmetries from (closed string) tachyon condensation | symmetries embedding symmetries. symmetries seem admit embedding isometries diffeomorphisms compactifications. symmetries embedded ones. extending supercritical extra acts. extra subsequently removed tachyon condensation breaks preserves subgroup. tachyon condensation quantitatively lightlike tachyon profiles. embedding symmetries realization topological defects tachyon solitons tantalizing reminiscence branes tachyon pages appendice | non_dup | [] |
24962131 | 10.1007/JHEP11(2013)147 | We consider the low-energy limit of the two-dimensional theory on k M2-branes
suspended between a straight M5-brane and a curved M5-brane. We argue that it
is described by an N=(2,2) supersymmetric gauge theory with no matter fields
but with a non-trivial twisted superpotential, and also by an N=(2,2)
supersymmetric Landau-Ginzburg model, such that the (twisted) superpotentials
are determined by the shape of the M5-branes. We find particular cases realize
Kazama-Suzuki models. Evidence is provided by the study of ground states,
chiral rings, BPS spectra and S^2 partition functions of the systems.Comment: 27 pages, 48 color figures; v2: several minor change | 2d SCFTs from M2-branes | 2d scfts from m2-branes | branes suspended straight brane curved brane. argue supersymmetric trivial twisted superpotential supersymmetric landau ginzburg twisted superpotentials branes. realize kazama suzuki models. chiral rings partition pages minor | non_dup | [] |
24972825 | 10.1007/JHEP11(2013)150 | A recent, integrability-based conjecture in the framework of the Wilson loop
OPE for N=4 SYM theory, predicts the leading OPE contribution for the hexagon
MHV remainder function and NMHV ratio function to all loops, in integral form.
We prove that these integrals evaluate to a particular basis of harmonic
polylogarithms, at any order in the weak coupling expansion. The proof
constitutes an algorithm for the direct computation of the integrals, which we
employ in order to obtain the full (N)MHV OPE contribution in question up to 6
loops, and certain parts of it up to 12 loops. We attach computer-readable
files with our results, as well as an algorithm implementation which may be
readily used to generate higher-loop corrections. The feasibility of obtaining
the explicit kinematical dependence of the first term in the OPE in principle
at arbitrary loop order, offers promise for the suitability of this approach as
a non-perturbative description of Wilson loops/scattering amplitudes.Comment: 34 pages, 4 figures, 7 ancillary files; v2: typos corrected,
references update | Hexagon Wilson Loop OPE and Harmonic Polylogarithms | hexagon wilson loop ope and harmonic polylogarithms | integrability conjecture wilson predicts hexagon remainder nmhv loops form. integrals harmonic polylogarithms expansion. constitutes integrals employ loops loops. attach readable files readily corrections. feasibility obtaining kinematical offers promise suitability perturbative wilson loops pages ancillary files typos corrected update | non_dup | [] |
24952567 | 10.1007/JHEP11(2013)151 | In analyzing maximally symmetric Lovelock black holes with non-planar horizon
topologies, many novel features have been observed. The existence of finite
radius singularities, a mass gap in the black hole spectrum and solutions
displaying multiple horizons are noteworthy examples. Naively, in all these
cases, the appearance of naked singularities seems unavoidable, leading to the
question of whether these theories are consistent gravity theories. We address
this question and show that whenever the cosmic censorship conjecture is
threaten, an instability generically shows up driving the system to a new
configuration with presumably no naked singularities. Also, the same kind of
instability shows up in the process of spherical black holes evaporation in
these theories, suggesting a new phase for their decay. We find circumstantial
evidence indicating that, contrary to many claims in the literature, the cosmic
censorship hypothesis holds in Lovelock theory.Comment: 25 pages, 6 figure | Cosmic censorship in Lovelock theory | cosmic censorship in lovelock theory | analyzing maximally lovelock holes planar horizon topologies observed. singularities displaying horizons noteworthy examples. naively appearance naked singularities unavoidable theories. whenever cosmic censorship conjecture threaten instability generically driving presumably naked singularities. kind instability spherical holes evaporation decay. circumstantial contrary claims cosmic censorship lovelock pages | non_dup | [] |
24957381 | 10.1007/JHEP11(2013)152 | Partition function of beta-gamma systems on the orbifolds C^2/Z_N and C^3/Z_M
x Z_N are obtained as the invariant part of that on the respective affine
spaces, by lifting the geometric action of the orbifold group to the fields.
Interpreting the sum over roots of unity as an elementary contour integration,
the partition function evaluates to an infinite series counting invariant
monomials composed of basic operators of the theory at each mass level.Comment: 14 pages; v2:corrected one typo, added reference | Partition function of beta-gamma system on orbifolds | partition function of beta-gamma system on orbifolds | partition beta gamma orbifolds respective affine lifting geometric orbifold fields. interpreting roots unity elementary contour partition evaluates infinite counting monomials composed pages corrected typo | non_dup | [] |
24961939 | 10.1007/JHEP11(2013)153 | The link between BFKL physics and twist-two operators involves an analytical
continuation in the spin of the operators away from the physical even integer
values. Typically this is done only after obtaining an analytical result for
integer spin through nested harmonic sums. In this paper we propose analyticity
conditions for the solution of Baxter equation which would work directly for
any value of complex spin and reproduce results from the analytical
continuation of harmonic sums. We carry out explicit contructions up to 2-loop
level. These nonstandard solutions of the Baxter equation have rather
surprising asymptotics. We hope that these analyticity conditions may be used
for incorporating them into the exact TBA/FiNLIE/QSC approaches valid at any
coupling.Comment: 22 pages, 1 figure, Mathematica notebook with numerical checks
included in the source submissio | Twist-two operators and the BFKL regime - nonstandard solutions of the
Baxter equation | twist-two operators and the bfkl regime - nonstandard solutions of the baxter equation | bfkl twist involves continuation away integer values. obtaining integer nested harmonic sums. propose analyticity baxter reproduce continuation harmonic sums. carry contructions level. nonstandard baxter surprising asymptotics. hope analyticity incorporating finlie valid pages mathematica notebook checks submissio | non_dup | [] |
24975379 | 10.1007/JHEP11(2013)156 | We introduce the physical factorisation scheme, which is necessary to
describe observables which are `not completely inclusive'. We derive the
formulae for NLO DGLAP evolution in this scheme, and also for the `rotation' of
the conventional MSbar PDFs into the physical representation. Unlike, the MSbar
prescription, where, for example, the gluon PDF at NLO obtains an admixture of
the quark-singlet PDF, and vice-versa, the physical approach does not mix
parton PDFs of different types. That is, the physical approach retains the
precise quantum numbers of each PDF. The NLO corrections to DGLAP evolution in
the physical scheme are less than those in the MSbar case, indicating a better
convergence of the perturbative series | Physical factorisation scheme for PDFs for non-inclusive applications | physical factorisation scheme for pdfs for non-inclusive applications | factorisation observables inclusive derive formulae dglap msbar pdfs representation. unlike msbar prescription gluon obtains admixture singlet vice versa parton pdfs types. retains precise pdf. dglap msbar perturbative | non_dup | [] |
24960308 | 10.1007/JHEP11(2013)157 | We study indices for 5d gauge theories on S^1 \times S^4/Z_n. In the large
orbifold limit, n \rightarrow \infty, we find evidence that the indices become
4d indices in the presence of a 't Hooft line operator. The non-perturbative
part of the index poses some subtleties when being compared to the 4d monopole
bubbling which happens in the presence of 't Hooft line operators. We study
such monopole bubbling indices and find an interesting connection to the
Hilbert series of the moduli space of instantons on an auxiliary ALE space.Comment: 43 page | 5d gauge theories on orbifolds and 4d 't Hooft line indices | 5d gauge theories on orbifolds and 4d 't hooft line indices | indices orbifold rightarrow infty indices indices hooft operator. perturbative poses subtleties monopole bubbling happens hooft operators. monopole bubbling indices connection hilbert moduli instantons auxiliary | non_dup | [] |
24933122 | 10.1007/JHEP11(2013)158 | We show the feasibility of tensor network solutions for lattice gauge
theories in Hamiltonian formulation by applying matrix product states
algorithms to the Schwinger model with zero and non-vanishing fermion mass. We
introduce new techniques to compute excitations in a system with open boundary
conditions, and to identify the states corresponding to low momentum and
different quantum numbers in the continuum. For the ground state and both the
vector and scalar mass gaps in the massive case, the MPS technique attains
precisions comparable to the best results available from other techniques.Comment: updated numerical results; accepted versio | The mass spectrum of the Schwinger model with Matrix Product States | the mass spectrum of the schwinger model with matrix product states | feasibility formulation schwinger vanishing fermion mass. excitations continuum. gaps massive attains precisions comparable updated versio | non_dup | [] |
24954778 | 10.1007/JHEP11(2013)159 | Extending earlier results by Paulos, we discuss further the use of the
embedding formalism and Mellin transform in the calculation of tree-level
correlators of scalar and vector fields in AdS/CFT. We present an iterative
procedure that builds amplitudes by sewing together lower-point off-shell
diagrams. Both scalar and vector correlators are shown to be given in terms of
Mellin amplitudes. We apply the procedure to the explicit calculation of
three-, four- and five-point correlators.Comment: 21 page | Tree-level Correlators of scalar and vector fields in AdS/CFT | tree-level correlators of scalar and vector fields in ads/cft | extending paulos embedding formalism mellin transform correlators cft. iterative builds amplitudes sewing diagrams. correlators mellin amplitudes. | non_dup | [] |
24955753 | 10.1007/JHEP11(2013)161 | The discovery of a standard-model-like Higgs at 126 GeV and the absence of
squark signals thus far at the LHC both point towards a mini-split spectrum for
supersymmetry. Within standard paradigms, it is non-trivial to realize a
mini-split spectrum with heavier sfermions but lighter gauginos while
simultaneously generating Higgs sector soft terms of the correct magnitude,
suggesting the need for new models of supersymmetry breaking and mediation. In
this paper, we present a new approach to mini-split model building based on
gauge mediation by ``auxiliary groups'', which are the anomaly-free continuous
symmetries of the standard model in the limit of vanishing Yukawa couplings. In
addition to the well-known flavor SU(3)_F and baryon-minus-lepton U(1)_{B-L}
groups, we find that an additional U(1)_H acting on the Higgs doublets alone
can be used to generate Higgs soft masses and B-terms necessary for a complete
model of mini-split. Auxiliary gauge mediation is a special case of Higgsed
gauge mediation, and we review the resulting two-loop scalar soft terms as well
as three-loop gaugino masses. Along the way, we present a complete two-loop
calculation of A-terms and B-terms in gauge mediation, which---contrary to a
common misconception---includes a non-zero contribution at the messenger
threshold which can be sizable in models with light gauginos. We present
several phenomenologically acceptable mini-split spectra arising from auxiliary
gauge mediation and highlight a complete minimal model which realizes the
required spectrum and Higgs sector soft terms with a single U(1)_X auxiliary
gauge symmetry. We discuss possible experimental consequences.Comment: 28 pages, 4 figures, 3 tables; v3: minor wording changes and
reference added to acknowledge priority of previous B-term calculations.
Conclusions unchanged. To be published in JHEP. v2: references added and
typos correcte | Auxiliary Gauge Mediation: A New Route to Mini-Split Supersymmetry | auxiliary gauge mediation: a new route to mini-split supersymmetry | discovery squark mini split supersymmetry. paradigms trivial realize mini split heavier sfermions lighter gauginos simultaneously generating supersymmetry breaking mediation. mini split mediation auxiliary anomaly symmetries vanishing yukawa couplings. flavor baryon minus lepton acting doublets mini split. auxiliary mediation higgsed mediation gaugino masses. mediation contrary misconception messenger sizable gauginos. phenomenologically acceptable mini split arising auxiliary mediation highlight realizes auxiliary symmetry. pages tables minor wording acknowledge priority calculations. unchanged. jhep. typos correcte | non_dup | [] |
24940746 | 10.1007/JHEP11(2013)163 | We propose that fast scrambling on finite-entropy stretched horizons can be
modeled by a diffusion process on an effective ultrametric geometry. A
scrambling time scaling logarithmically with the entropy is obtained when the
elementary transition rates saturate causality bounds on the stretched horizon.
The so-defined ultrametric diffusion becomes unstable in the infinite-entropy
limit. A formally regularized version can be shown to follow a particular case
of the Kohlrausch law.Comment: 14 pages, 2 figures. Two extra sections, one figure and references
adde | Fast Scramblers And Ultrametric Black Hole Horizons | fast scramblers and ultrametric black hole horizons | propose scrambling stretched horizons modeled ultrametric geometry. scrambling logarithmically elementary saturate causality bounds stretched horizon. ultrametric unstable infinite limit. formally regularized kohlrausch pages figures. extra adde | non_dup | [] |
24964548 | 10.1007/JHEP11(2013)164 | R\'enyi entanglement entropy provides a new window to study the AdS/CFT
correspondence. In this paper we consider the short interval expansion of
R\'enyi entanglement entropy in two-dimensional conformal field theory. This
amounts to do the operator product expansion of the twist operators. We focus
on the vacuum Verma module and consider the quasiprimary operators constructed
from the stress tensors. After obtaining the expansion coefficients of the
twist operators to level 6 in vacuum Verma module, we compute the leading
contributions to the R\'enyi entropy, to order 6 in the short interval
expansion. In the case of one short interval on cylinder, we reproduce the
first several leading contributions to the R\'enyi entropy. In the case of two
short disjoint intervals with a small cross ratio $x$, we obtain not only the
classical and 1-loop quantum contributions to the R\'enyi entropy to order
$x^6$, both of which are in perfect match with the ones found in gravity, but
also the leading $1/c$ contributions, which corresponds to 2-loop corrections
in the bulk.Comment: V1, 23 pages, 5 figures; V2, published version, typos corrected,
references adde | On short interval expansion of R\'enyi entropy | on short interval expansion of r\'enyi entropy | enyi entanglement window correspondence. enyi entanglement conformal theory. amounts twist operators. verma module quasiprimary tensors. obtaining twist verma module enyi expansion. cylinder reproduce enyi entropy. disjoint intervals enyi perfect match pages typos corrected adde | non_dup | [] |
24958938 | 10.1007/JHEP11(2013)165 | We consider the question about the number of master integrals for a multiloop
Feynman diagram. We show that, for a given set of denominators, this number is
totally determined by the critical points of the polynomials entering either of
the two representations: the parametric representation and the Baikov
representation. In particular, for the parametric representation the
corresponding polynomial is just the sum of Symanzik polynomials. The relevant
topological invariant is the sum of the Milnor numbers of the proper critical
points. We present a Mathematica package Mint to automatize the counting of the
master integrals.Comment: 16 pages, minor change | Critical points and number of master integrals | critical points and number of master integrals | master integrals multiloop feynman diagram. denominators totally polynomials entering representations parametric baikov representation. parametric symanzik polynomials. topological milnor proper points. mathematica package mint automatize counting master pages minor | non_dup | [] |
24964179 | 10.1007/JHEP11(2013)167 | We investigate the power of low-energy, high-luminosity electron--positron
colliders to probe hidden sectors with a mass below ~10 GeV that couple to
Standard Model particles through a light mediator. Such sectors provide
well-motivated dark matter candidates, and can give rise to distinctive
mono-photon signals at B-factories and similar experiments. We use data from an
existing mono-photon search by BaBar to place new constraints on this class of
models, and give projections for the sensitivity of a similar search at a
future B-factory such as Belle II. We find that the sensitivity of such
searches are more powerful than searches at other collider or fixed-target
facilities for hidden-sector mediators and particles with masses between a few
hundred MeV and 10 GeV. Mediators produced on-shell and decaying invisibly to
hidden-sector particles such as dark matter can be probed particularly well.
Sensitivity to light dark matter produced through an off-shell mediator is more
limited, but may be improved with a better control of backgrounds, allowing
background estimation and a search for kinematic edges. We compare our results
to existing and future direct detection experiments and show that low-energy
colliders provide an indispensable and complementary avenue to search for light
dark matter. The implementation of a mono-photon trigger at Belle II would
provide an unparalleled window into such light hidden sectors.Comment: 16 pages, 10 figures; typos corrected and references adde | Constraining Light Dark Matter with Low-Energy e+e- Colliders | constraining light dark matter with low-energy e+e- colliders | luminosity positron colliders hidden sectors couple mediator. sectors motivated candidates distinctive mono factories experiments. mono babar projections factory belle searches powerful searches collider facilities hidden mediators hundred gev. mediators decaying invisibly hidden probed well. mediator backgrounds allowing kinematic edges. colliders indispensable complementary avenue matter. mono trigger belle unparalleled window hidden pages typos corrected adde | non_dup | [] |
24950314 | 10.1007/JHEP11(2013)168 | We investigate the thermodynamics of the flavour sector of the Sakai-Sugimoto
model in the presence of a magnetic field. Renormalizing the euclidean
Dirac-Born-Infeld action in the antipodal limit, we find for the confined and
deconfined phases positive contributions to the pressures that grow with the
magnetic field. We also obtain positive magnetic susceptibilities indicating a
paramagnetic behaviour of quarks. Using these results we estimate a
\lambda^2/N_c correction to the deconfinement temperature that decreases as a
function of the magnetic field.Comment: V4 1+20 pages, 6 figures, references and one figure added. Version
published in JHE | Holographic deconfinement transition in the presence of a magnetic field | holographic deconfinement transition in the presence of a magnetic field | thermodynamics flavour sakai sugimoto field. renormalizing euclidean dirac born infeld antipodal confined deconfined pressures grow field. susceptibilities paramagnetic quarks. lambda deconfinement pages added. | non_dup | [] |
24944956 | 10.1007/JHEP11(2013)170 | In order to support the odd moduli in models of (type IIB) string
compactification, we classify the Calabi-Yau threefolds with h^{1,1}<=4 which
exhibit pairs of identical divisors, with different line-bundle charges,
mapping to each other under possible divisor exchange involutions. For this
purpose, the divisors of interest are identified as completely rigid surface,
Wilson surface, K3 surface and some other deformation surfaces. Subsequently,
various possible exchange involutions are examined under the symmetry of
Stanley-Reisner Ideal. In addition, we search for the Calabi-Yau theefolds
which contain a divisor with several disjoint components. Under certain
reflection involution, such spaces also have nontrivial odd components in
(1,1)-cohomology class. String compactifications on such Calabi-Yau
orientifolds with non-zero h^{1,1}_-(CY_3/\sigma) could be promising for
concrete model building in both particle physics and cosmology. In the spirit
of using such Calabi-Yau orientifolds in the context of LARGE volume scenario,
we also present some concrete examples of (strong/weak) swiss-cheese type
volume form.Comment: 33 pages, references added, with external Mathematica file, published
in JHE | On Classifying the Divisor Involutions in Calabi-Yau Threefolds | on classifying the divisor involutions in calabi-yau threefolds | moduli compactification classify calabi threefolds exhibit divisors bundle charges divisor involutions. divisors rigid wilson deformation surfaces. subsequently involutions stanley reisner ideal. calabi theefolds divisor disjoint components. reflection involution nontrivial cohomology class. compactifications calabi orientifolds sigma promising concrete cosmology. spirit calabi orientifolds concrete swiss cheese pages mathematica file | non_dup | [] |
24952875 | 10.1007/JHEP11(2013)171 | We study a class of simplified dark matter models in which one dark matter
particle couples with a mediator and a Standard Model fermion. In such models,
collider and direct detection searches probe complimentary regions of parameter
space. For Majorana dark matter, direct detection covers the region near
mediator-dark matter degeneracy, while colliders probe regions with a large
dark matter and mediator mass splitting. For Dirac and complex dark matter,
direct detection is effective for the entire region above the mass threshold,
but colliders provide a strong bound for dark matter lighter than a few GeV. We
also point out that dedicated searches for signatures with two jets or a
mono-jet not coming from initial state radiation, along missing transverse
energy can cover the remaining parameter space for thermal relic dark matter.Comment: 22 pages, 10 figures; corrections made on coannihilation parts,
references added; corrections made on Majorana fermion direct detectio | Fermion Portal Dark Matter | fermion portal dark matter | simplified couples mediator fermion. collider searches complimentary space. majorana covers mediator degeneracy colliders mediator splitting. dirac colliders lighter gev. dedicated searches signatures jets mono coming missing cover relic pages coannihilation majorana fermion detectio | non_dup | [] |
24947589 | 10.1007/JHEP11(2013)172 | We introduce a novel set of stability conditions for vacua with broken
Lorentz symmetry. The first class of conditions require that the energy be
minimized under small geometric deformations, which translates into requiring
the positivity of a "stiffness" four-tensor. The second class of conditions
requires that stress forces be restoring under small deformations. We then
apply these conditions to examples of recently-discovered spatially modulated
(or "striped") phases in holographic models of superconductors and high-density
QCD. For backreacted solutions we find that the pressure condition is
equivalent to thermodynamic stability. For probe solutions, however, these
conditions are in conflict with the minimization of the free energy. This
suggests that either the solutions are unstable or the definition of the free
energy in the probe approximation must be revised for these solutions.Comment: 28 pages, 6 figures, references adde | Stability conditions for spatially modulated phases | stability conditions for spatially modulated phases | vacua broken lorentz symmetry. minimized geometric deformations translates requiring positivity stiffness tensor. forces restoring deformations. discovered spatially modulated striped holographic superconductors qcd. backreacted thermodynamic stability. conflict minimization energy. unstable revised pages adde | non_dup | [] |
24942572 | 10.1007/JHEP11(2013)173 | We consider an SO(10) grand unified theory in which the ratio of the SU(2)_W
and SU(3)_c gaugino masses satisfy M_2/M_3 \approx 3, which results in the
realization of natural supersymmetry. In the MSSM parameter space this relation
looks artificial, but in the SO(10) case it results from a field with a
designated vacuum expectation value. We consider two models, namely
M_1:M_2:M_3=-1/5:3:1 (Case I), and M_1:M_2:M_3=-5:3:1 (Case II). Focusing on
ameliorating the little hierarchy problem, we explore the parameter space of
these models which yield small fine-tuning measuring parameters (natural
supersymmetry) at the electroweak scale (\Delta_{EW}) as well as at the high
scale (\Delta_{HS}). Although both models allow for the solution of the little
hierarchy problem, the predicted sparticle spectra can differ markedly in the
two cases. Depending on the ratio of the bino mass to the other gaugino masses,
Case I leads to stau lepton masses of around a 100 GeV, while in Case II, the
stau slepton masses are in the several TeV range. In Case I, the bino-like
neutralino can be as light as 90 GeV, while the gluino is heavier than 2 TeV or
so. In Case II, due to gluino-bino near degeneracy, the bino cannot be lighter
than a TeV or so. Having a light neutralino with sizable bino-higgsino mixture
in Case I allows the direct dark matter search experiments to test this class
of models.Comment: 22 pages, 9 figures, 2 tables. arXiv admin note: text overlap with
arXiv:1212.2593, arXiv:1303.696 | SO(10) as a Framework for Natural Supersymmetry | so(10) as a framework for natural supersymmetry | grand unified gaugino satisfy approx realization supersymmetry. mssm looks artificial designated expectation value. focusing ameliorating hierarchy explore fine tuning measuring supersymmetry electroweak delta delta hierarchy sparticle markedly cases. bino gaugino stau lepton stau slepton range. bino neutralino gluino heavier gluino bino degeneracy bino lighter neutralino sizable bino higgsino mixture pages tables. admin overlap | non_dup | [] |
24954807 | 10.1007/JHEP11(2013)175 | The collision of two massless, gravitationally interacting, point-like
massless particles, boosted to the speed of light, colliding with an impact
parameter b is being investigated. The collision takes place in four space-time
flat dimensional background. A perturbative scheme is employed and the
corrections to the energy momentum tensor and to the metric are computed and
closed form formulas are provided. This includes the back-reaction on the
metric after the collision. Including such corrections suggests that the
tracelessness of the initial stress tensors of the colliding particles is
preserved during and after the collision. The necessity for introducing an
impact parameter in the perturbative treatment is highlighted and the breaking
of the underlying perturbative approach at b = 0 is motivated. In addition, the
energy radiated in the form of gravitational bremsstrahlung radiation is
discussed while an example from gravitational-waves collision is being studied.Comment: 16 pages, 7 figure | Bremsstrahlung and black hole production from collisions of
ultra-boosted particles at non-zero impact parameter | bremsstrahlung and black hole production from collisions of ultra-boosted particles at non-zero impact parameter | collision massless gravitationally interacting massless boosted colliding investigated. collision background. perturbative formulas provided. collision. tracelessness tensors colliding preserved collision. necessity introducing perturbative highlighted breaking perturbative motivated. radiated gravitational bremsstrahlung gravitational collision pages | non_dup | [] |
24987221 | 10.1007/JHEP11(2013)176 | The remnants are investigated by fermions' tunnelling from a 4-dimensional
charged dilatonic black hole and a 5-dimensional black string. Based on the
generalized uncertainty principle, effects of quantum gravity are taken into
account. The quantum numbers of the emitted fermions affects the Hawking
temperatures. For the black hole, the quantum gravity correction slows down the
increase of the temperature, which leads to the remnant left in the
evaporation. For the black string, the existence of the remnant is determined
by the quantum gravity correction and effects of the extra compact dimension.Comment: 15 page | Remnants, fermions' tunnelling and effects of quantum gravity | remnants, fermions' tunnelling and effects of quantum gravity | remnants fermions tunnelling dilatonic string. account. emitted fermions affects hawking temperatures. slows remnant evaporation. remnant extra | non_dup | [] |
24969203 | 10.1007/JHEP11(2013)178 | We use Schwinger's proper time method to compute the parity odd contributions
to the U(1) current and energy-momentum tensor of an ideal gas of fermions in
2+1 dimensions in the presence of static gauge and gravitational backgrounds.
From these results the equilibrium partition function at first order in the
derivative expansion is explicitly obtained by integration. The form of the
computed partition function is consistent with general arguments based on
Kaluza-Klein and gauge invariance.Comment: 16 pages. 1 reference added, typo in Eq. (3.34) corrected. Matches
journal versio | Parity odd equilibrium partition function in 2+1 dimensions | parity odd equilibrium partition function in 2+1 dimensions | schwinger proper parity ideal fermions gravitational backgrounds. partition explicitly integration. partition arguments kaluza klein pages. typo corrected. matches versio | non_dup | [] |
24953485 | 10.1007/JHEP11(2013)179 | We study the non-perturbative stability of the Large Volume Scenario (LVS) of
IIB string compactifications, by analysing transitions mediated by the
Brown-Teitelboim (BT) brane nucleations and by Coleman De Luccia tunneling
(CDL). We find that, as long as the effective field theory description holds,
the LVS AdS minima are stable despite being non-supersymmetric. This opens the
possibility of having a CFT dual. Metastable de Sitter vacua behave differently
depending on the uplifting mechanism. We find explicit expressions for the
different decay rates in terms of exponentials of the volume. Among the
transitions of dS to dS those with increasing volume and decreasing vacuum
energy are preferred, though dS decays to AdS (big-crunch sinks) have higher
probability. However, the probability of transitions via the CDL mechanism to
decompactification are exponentially much larger compared to these. The BT
decays correspond to flux/D3 brane transitions mediated by the nucleation of
D5/NS5 branes. We compare our results with previous analysis for KKLT, type
IIA, and 6D Einstein-Maxwell studies. In particular we find no indication for a
bubble of nothing decay.Comment: An error (equation 5.5) is corrected and references added. The main
conclusion is unchange | Stability, Tunneling and Flux Changing de Sitter Transitions in the
Large Volume String Scenario | stability, tunneling and flux changing de sitter transitions in the large volume string scenario | perturbative compactifications analysing brown teitelboim brane nucleations coleman luccia tunneling minima supersymmetric. opens dual. metastable sitter vacua behave differently uplifting mechanism. expressions exponentials volume. decreasing preferred decays crunch sinks probability. decompactification exponentially these. decays brane nucleation branes. kklt einstein maxwell studies. indication bubble nothing corrected added. unchange | non_dup | [] |
24968475 | 10.1007/JHEP11(2013)180 | Discovering CP-violating effects in the Higgs sector would constitute an
indisputable sign of physics beyond the Standard Model. We derive constraints
on the CP-violating Higgs-boson couplings to top and bottom quarks as well as
to tau leptons from low-energy bounds on electric dipole moments, resumming
large logarithms when necessary. The present and future projections of the
sensitivities and comparisons with the LHC constraints are provided.
Non-trivial constraints are possible in the future, even if the Higgs boson
only couples to the third-generation fermions.Comment: 26 pages, 10 figures; typos corrected, version as published in JHE | Constraints on CP-violating Higgs couplings to the third generation | constraints on cp-violating higgs couplings to the third generation | discovering violating constitute indisputable model. derive violating boson couplings quarks leptons bounds dipole moments resumming logarithms necessary. projections sensitivities comparisons provided. trivial boson couples pages typos corrected | non_dup | [] |
44153992 | 10.1007/JHEP11(2013)184 | In this paper we provide an alternative method to compute correlation functions in the in-in formalism. We develop a modified set of Feynman rules that allows for an easier computation of loop corrections. With respect to the standard in-in formalism (where the diagrammatic representation is very compact but the evaluation of each diagram is rather involved and contains many different contributions), in our formulation the major effort is devoted to drawing the diagrams, while their mathematical interpretation is straightforward. Our method is particularly suitable for applications to cosmology | A new diagrammatic representation for correlation functions in the in-in formalism | a new diagrammatic representation for correlation functions in the in-in formalism | formalism. feynman easier corrections. formalism diagrammatic formulation effort devoted drawing diagrams mathematical straightforward. cosmology | non_dup | [] |
24937209 | 10.1007/JHEP11(2013)186 | If there is a dS/CFT correspondence, time evolution in the bulk should
translate to RG flows in the dual euclidean field theory. Consequently,
although the dual field is expected to be non-unitary, its RG flows will carry
an imprint of the unitary time evolution in the bulk. In this note we examine
the prediction of holographic RG in de Sitter space for the flow of double and
triple trace couplings in any proposed dual. We show quite generally that the
correct form of the field theory beta functions for the double trace couplings
is obtained from holography, provided one identifies the scale of the field
theory with (i|T|) where T is the `time' in conformal coordinates. For dS(4),
we find that with an appropriate choice of operator normalization, it is
possible to have real n-point correlation functions as well as beta functions
with real coefficients. This choice leads to an RG flow with an IR fixed point
at negative coupling unlike in a unitary theory where the IR fixed point is at
positive coupling. The proposed correspondence of Sp(N) vector models with de
Sitter Vasiliev gravity provides a specific example of such a phenomenon. For
dS(d+1) with even d, however, we find that no choice of operator normalization
exists which ensures reality of coefficients of the beta-functions as well as
absence of n-dependent phases for various n-point functions, as long as one
assumes real coupling constants in the bulk Lagrangian.Comment: 18 pages, no figures; (v2) minor typos fixed, references adde | Double Trace Flows and Holographic RG in dS/CFT correspondence | double trace flows and holographic rg in ds/cft correspondence | correspondence translate flows euclidean theory. unitary flows carry imprint unitary bulk. examine holographic sitter triple trace couplings dual. beta trace couplings holography identifies conformal coordinates. normalization beta coefficients. unlike unitary coupling. correspondence sitter vasiliev phenomenon. normalization ensures reality beta assumes pages minor typos adde | non_dup | [] |
24942800 | 10.1007/JHEP11(2013)187 | We analyze the structure of quark and lepton mass matrices under the
hypothesis that they are determined from a minimum principle applied to a
generic potential invariant under the $\left[SU(3)\right]^5\otimes \mathcal
O(3)$ flavor symmetry, acting on Standard Model fermions and right-handed
neutrinos. Unlike the quark case, we show that hierarchical masses for charged
leptons are naturally accompanied by degenerate Majorana neutrinos with one
mixing angle close to maximal, a second potentially large, a third one
necessarily small, and one maximal relative Majorana phase. Adding small
perturbations the predicted structure for the neutrino mass matrix is in
excellent agreement with present observations and could be tested in the near
future via neutrino-less double beta decay and cosmological measurements. The
generalization of these results to arbitrary sew-saw models is also discussed.Comment: Journal version; corrections on the discussion of one of the Majorana
phases and other precisions adde | Neutrino Mixing and Masses from a Minimum Principle | neutrino mixing and masses from a minimum principle | analyze lepton generic otimes mathcal flavor acting fermions handed neutrinos. unlike hierarchical leptons naturally accompanied degenerate majorana neutrinos maximal potentially necessarily maximal majorana phase. adding perturbations excellent beta cosmological measurements. generalization majorana precisions adde | non_dup | [] |
24962656 | 10.1007/JHEP11(2013)190 | We perform an analysis of Higgs portal models of dark matter (DM), where DM
is light enough to contribute to invisible Higgs decays. Using effective field
theory we show that DM can be a thermal relic only if there are additional
light particles present with masses below a few 100 GeV. We give three concrete
examples of viable Higgs portal models of light DM: (i) the SM extended by DM
scalar along with an electroweak triplet and a singlet, (ii) a Two Higgs
Doublet Model of type II with additional scalar DM, (iii) SM with DM and an
extra scalar singlet that is lighter than DM. In all three examples the Br(h to
invisible) constraint is not too restrictive, because it is governed by
different parameters than the relic abundance. Additional light particles can
have implications for flavor violation and collider searches.Comment: 31 pages, 9 figures; version as publishe | Constraining Higgs mediated dark matter interactions | constraining higgs mediated dark matter interactions | portal invisible decays. relic gev. concrete viable portal electroweak triplet singlet doublet extra singlet lighter invisible restrictive governed relic abundance. flavor violation collider pages publishe | non_dup | [] |
24958377 | 10.1007/JHEP11(2013)191 | We construct parametrizations of light-cone distribution amplitudes (LCDAs)
for B-mesons and Lambda_b-baryons that obey various theoretical constraints,
and which are simple to use in factorization theorems relevant for
phenomenological applications in heavy-flavour physics. In particular, we find
the eigenfunctions of the Lange-Neubert renormalization kernel, which allow for
a systematic implementation of renormalization-group evolution effects for both
B-meson and \Lambda_b-baryon decays. We also present a new strategy to
construct LCDA models from momentum-space projectors, which can be used to
implement Wandzura-Wilczek--like relations, and which allow for a comparison
with theoretical approaches that go beyond the collinear limit for the
light-quark momenta in energetic heavy-hadron decays.Comment: 39 pages, 11 figure | Light-Cone Distribution Amplitudes for Heavy-Quark Hadrons | light-cone distribution amplitudes for heavy-quark hadrons | parametrizations cone amplitudes lcdas mesons lambda baryons obey factorization theorems phenomenological flavour physics. eigenfunctions lange neubert renormalization kernel renormalization meson lambda baryon decays. lcda projectors implement wandzura wilczek collinear momenta energetic hadron pages | non_dup | [] |
29839998 | 10.1007/JHEP11(2013)192 | JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0A procedure is developed for constructing deformations of integrable ??-models which are themselves classically integrable. When applied to the principal chiral model on any compact Lie group F, one recovers the Yang-Baxter ??-model introduced a few years ago by C. Klim????k. In the case of the symmetric space ??-model on F/G we obtain a new one-parameter family of integrable ??-models. The actions of these models correspond to a deformation of the target space geometry and include a torsion term. An interesting feature of the construction is the q-deformation of the symmetry corresponding to left multiplication in the original models, which becomes replaced by a classical q-deformed Poisson-Hopf algebra. Another noteworthy aspect of the deformation in the coset ??-model case is that it interpolates between a compact and a non-compact symmetric space. This is exemplified in the case of the SU(2)/U(1) coset ??-model which interpolates all the way to the SU(1, 1)/U(1) coset ??-mode | On classical q-deformations of integrable sigma-models | on classical q-deformations of integrable sigma-models | jhep funded scoap licensed constructing deformations integrable classically integrable. principal chiral recovers baxter klim integrable models. deformation torsion term. deformation multiplication replaced deformed poisson hopf algebra. noteworthy aspect deformation coset interpolates space. exemplified coset interpolates coset | non_dup | [] |
24963186 | 10.1007/JHEP11(2013)193 | We present constraints on decaying and annihilating dark matter (DM) in the 4
keV to 10 GeV mass range, using published results from the satellites HEAO-1,
INTEGRAL, COMPTEL, EGRET, and the Fermi Gamma-ray Space Telescope. We derive
analytic expressions for the gamma-ray spectra from various DM decay modes, and
find lifetime constraints in the range 10^24-10^28 sec, depending on the DM
mass and decay mode. We map these constraints onto the parameter space for a
variety of models, including a hidden photino that is part of a kinetically
mixed hidden sector, a gravitino with R-parity violating decays, a sterile
neutrino, DM with a dipole moment, and a dark pion. The indirect constraints on
sterile-neutrino and hidden-photino DM are found to be more powerful than other
experimental or astrophysical probes in some parts of parameter space. While
our focus is on decaying DM, we also present constraints on DM annihilation to
electron-positron pairs. We find that if the annihilation is p-wave suppressed,
the galactic diffuse constraints are, depending on the DM mass and velocity at
recombination, more powerful than the constraints from the Cosmic Microwave
Background.Comment: 35 pages, 15 figures; matches journal versio | Constraining Light Dark Matter with Diffuse X-Ray and Gamma-Ray
Observations | constraining light dark matter with diffuse x-ray and gamma-ray observations | decaying annihilating satellites heao comptel egret fermi gamma telescope. derive analytic expressions gamma lifetime mode. hidden photino kinetically hidden gravitino parity violating decays sterile dipole moment pion. indirect sterile hidden photino powerful astrophysical probes space. decaying annihilation positron pairs. annihilation suppressed galactic diffuse recombination powerful cosmic microwave pages matches versio | non_dup | [] |
24953359 | 10.1007/JHEP11(2013)195 | The running of quantum field theories can be studied in detail with the use
of a local renormalization group equation. The usual beta-function effects are
easy to include, but by introducing spacetime-dependence of the various
parameters of the theory one can efficiently incorporate renormalization
effects of composite operators as well. An illustration of the power of these
methods was presented by Osborn in the early 90s, who used consistency
conditions following from the Abelian nature of the Weyl group to rederive
Zamolodchikov's c-theorem in d=2 spacetime dimensions, and also to obtain a
perturbative a-theorem in d=4. In this work we present an extension of Osborn's
work to d=6 and to general even d. We compute the full set of Weyl consistency
conditions, and we discover among them a candidate for an a-theorem in d=6,
similar to the d=2,4 cases studied by Osborn. Additionally, we show that in any
even spacetime dimension one finds a consistency condition that may serve as a
generalization of the c-theorem, and that the associated candidate c-function
involves the coefficient of the Euler term in the trace anomaly. Such a
generalization hinges on proving the positivity of a certain "metric" in the
space of couplings.Comment: 19 pages, Mathematica file with consistency conditions included in
submission. v2: Fixed typo | Consequences of Weyl Consistency Conditions | consequences of weyl consistency conditions | running renormalization equation. usual beta introducing spacetime efficiently incorporate renormalization composite well. illustration osborn consistency abelian weyl rederive zamolodchikov spacetime perturbative osborn weyl consistency discover candidate osborn. additionally spacetime finds consistency serve generalization candidate involves euler trace anomaly. generalization hinges proving positivity pages mathematica file consistency submission. typo | non_dup | [] |
24967124 | 10.1007/JHEP11(2013)196 | We discuss a formulation of Galileon actions in terms of matrix determinants
in four dimensions. This approach allows one to straightforwardly determine
derivative couplings between Galileons and scalar or vector degrees of freedom
that lead to equations of motion with at most two space-time derivatives. We
use this method to easily build generalizations of Galileon set-ups preserving
conformal symmetry, finding explicit examples of couplings between Galileons
and additional degrees of freedom that preserve the Galileon conformal
invariance. We discuss various physical applications of our method and of our
results.Comment: 11 pages, no figures. v2: JHEP versio | Conformal couplings of Galileons to other degrees of freedom | conformal couplings of galileons to other degrees of freedom | formulation galileon determinants dimensions. straightforwardly couplings galileons freedom derivatives. build generalizations galileon preserving conformal couplings galileons freedom preserve galileon conformal invariance. pages figures. jhep versio | non_dup | [] |
5259389 | 10.1007/JHEP11(2013)199 | The partition function on the three-sphere of N=3 Chern-Simons-matter
theories can be formulated in terms of an ideal Fermi gas. In this paper we
show that, in theories with N=2 supersymmetry, the partition function
corresponds to a gas of interacting fermions in one dimension. The large N
limit is the thermodynamic limit of the gas and it can be analyzed with the
Hartree and Thomas-Fermi approximations, which lead to the known large N
solutions of these models. We use this interacting fermion picture to analyze
in detail N=2 theories with one single node. In the case of theories with no
long-range forces we incorporate exchange effects and argue that the partition
function is given by an Airy function, as in N=3 theories. For the theory with
g adjoint superfields and long-range forces, the Thomas-Fermi approximation
leads to an integral equation which determines the large N, strongly coupled
R-charge.Comment: 29 pages, 4 figure | Interacting fermions and N=2 Chern-Simons-matter theories | interacting fermions and n=2 chern-simons-matter theories | partition sphere chern simons formulated ideal fermi gas. supersymmetry partition interacting fermions dimension. thermodynamic hartree thomas fermi approximations models. interacting fermion picture analyze node. forces incorporate argue partition airy theories. adjoint superfields forces thomas fermi determines pages | non_dup | [] |
24955788 | 10.1007/JHEP11(2013)200 | We perform nonperturbative studies of N=4 super Yang-Mills theory by Monte
Carlo simulation. In particular, we calculate the correlation functions of
chiral primary operators to test the AdS/CFT correspondence. Our results agree
with the predictions obtained from the AdS side that the SUSY
non-renormalization property is obeyed by the three-point functions but
\emph{not} by the four-point functions investigated in this paper. Instead of
the lattice regularization, we use a novel regularization of the theory based
on an equivalence in the large-N limit between the N=4 SU(N) theory on RxS^3
and a one-dimensional SU(N) gauge theory known as the plane-wave (BMN) matrix
model. The equivalence extends the idea of large-N reduction to a curved space
and, at the same time, overcomes the obstacle related to the center symmetry
breaking. The adopted regularization preserves 16 SUSY, which is crucial in
testing the AdS/CFT correspondence with the available computer resources. The
only SUSY breaking effects, which come from the momentum cutoff $\Lambda$ in R
direction, are made negligible by using sufficiently large $\Lambda$.Comment: v1) 39 pages, 12 figures; v2) references added; v3) published version
with minor correction | Direct test of the AdS/CFT correspondence by Monte Carlo studies of N=4
super Yang-Mills theory | direct test of the ads/cft correspondence by monte carlo studies of n=4 super yang-mills theory | nonperturbative super mills monte carlo simulation. chiral correspondence. agree susy renormalization obeyed emph paper. regularization regularization equivalence model. equivalence extends curved overcomes obstacle breaking. adopted regularization preserves susy crucial correspondence resources. susy breaking come cutoff lambda negligible sufficiently lambda .comment pages minor | non_dup | [] |
24955916 | 10.1007/JHEP11(2013)202 | We derive bounds on squark and slepton masses in mini-split supersymmetry
scenario using low energy experiments. In this setup gauginos are at the TeV
scale, while sfermions are heavier by a loop factor. We cover the most
sensitive low energy probes including electric dipole moments (EDMs), meson
oscillations and charged lepton flavor violation (LFV) transitions. A leading
log resummation of the large logs of gluino to sfermion mass ratio is
performed. A sensitivity to PeV squark masses is obtained at present from kaon
mixing measurements. A number of observables, including neutron EDMs, mu->e
transitions and charmed meson mixing, will start probing sfermion masses in the
100 TeV-1000 TeV range with the projected improvements in the experimental
sensitivities. We also discuss the implications of our results for a variety of
models that address the flavor hierarchy of quarks and leptons. We find that
EDM searches will be a robust probe of models in which fermion masses are
generated radiatively, while LFV searches remain sensitive to simple-texture
based flavor models.Comment: 49 pages, 17 figures, v4: Eq. (24) and Fig. 11 corrected; conclusions
unchange | Low Energy Probes of PeV Scale Sfermions | low energy probes of pev scale sfermions | derive bounds squark slepton mini split supersymmetry experiments. setup gauginos sfermions heavier factor. cover probes dipole moments edms meson oscillations lepton flavor violation transitions. resummation logs gluino sfermion performed. squark kaon measurements. observables neutron edms charmed meson probing sfermion projected improvements sensitivities. flavor hierarchy quarks leptons. searches robust fermion radiatively searches texture flavor pages fig. corrected unchange | non_dup | [] |
24954660 | 10.1007/JHEP11(2013)203 | We present a set of constraints on superfield strengths of the non-Abelian
p-form potentials in D=6 (1,0) superspace which reproduces, as their
selfconsistency conditions, the equations of motion of the recently proposed
(1,0) superconformal theory. These include the anti-self-duality conditions for
the field strength of the non-Abelian 2-form potential, duality between field
strengths of the non-Abelian vectors and 3-forms as well as of the non-Abelian
four forms and scalar fields.Comment: 1+10 pages, no figures. V2: New section added, discussion extended,
1+19 pages, to appear in JHE | Non-Abelian tensor hierarchy in (1,0) D=6 superspace | non-abelian tensor hierarchy in (1,0) d=6 superspace | superfield strengths abelian potentials superspace reproduces selfconsistency superconformal theory. duality abelian duality strengths abelian abelian pages figures. pages | non_dup | [] |
24947336 | 10.1007/JHEP11(2013)204 | We compute three and four point functions of the non-BPS scattering
amplitudes, including a closed string Ramond-Ramond, gauge/scalar and tachyon
in type IIA (IIB) superstring theories. We then discover a unique expansion for
tachyon amplitudes in both non-BPS and D-brane anti D-brane formalisms. Based
on remarks on Chan-Paton factors and arXiv:1304.3711, we propose selection
rules for all non-BPS scattering amplitudes of type II superstring theory.
These selection rules, rule out various non-BPS higher point correlation
functions of the string theory.Comment: 27 pages, Latex file, no figure,v2: the title is shortened. To appear
in JHE | Selection Rules and RR Couplings on Non-BPS Branes | selection rules and rr couplings on non-bps branes | amplitudes ramond ramond tachyon superstring theories. discover tachyon amplitudes brane brane formalisms. remarks chan paton propose amplitudes superstring theory. pages latex file title shortened. | non_dup | [] |
24954591 | 10.1007/JHEP11(2013)207 | We formulate a method for computing the effective Lagrangian of the Polyakov
line on the lattice. Using mean field approximation we calculate the effective
potential for high temperatures. The result agrees with recent lattice
simulations. We reveal a new type of ultraviolet divergence (coming from
longitudinal gluons) which dominates the effective potential and explains the
discrepancy of the lattice simulations and standard perturbative calculations
performed in covariant gauges.Comment: Comments and references added. Version to appear in JHE | Effective Lagrangian for the Polyakov line on a lattice | effective lagrangian for the polyakov line on a lattice | formulate lagrangian polyakov lattice. temperatures. agrees simulations. reveal ultraviolet divergence coming longitudinal gluons dominates explains discrepancy perturbative covariant comments added. | non_dup | [] |
24954605 | 10.1007/JHEP11(2013)208 | Black holes in 2+1 dimensions enjoy long range topological interactions
similar to those of non-abelian anyon excitations in a topologically ordered
medium. Using this observation, we compute the topological entanglement entropy
of BTZ black holes, via the established formula S_top = log(S^a_0), with S_b^a
the modular S-matrix of the Virasoro characters chi_a(tau). We find a precise
match with the Bekenstein-Hawking entropy. This result adds a new twist to the
relationship between quantum entanglement and the interior geometry of black
holes. We generalize our result to higher spin black holes, and again find a
detailed match. We comment on a possible alternative interpretation of our
result in terms of boundary entropy.Comment: 15 pages, 3 figures; typos corrected, references adde | Bekenstein-Hawking Entropy as Topological Entanglement Entropy | bekenstein-hawking entropy as topological entanglement entropy | holes enjoy topological abelian anyon excitations topologically ordered medium. topological entanglement holes modular virasoro characters precise match bekenstein hawking entropy. adds twist entanglement interior holes. generalize holes match. comment pages typos corrected adde | non_dup | [] |
24956432 | 10.1007/JHEP11(2013)209 | For the case of the MSSM and the most general form of the NMSSM (GNMSSM) we
determine the reduction in the fine tuning that follows from allowing gaugino
masses to be non-degenerate at the unification scale, taking account of the
LHC8 bounds on SUSY masses, the Higgs mass bound, gauge coupling unification
and the requirement of an acceptable dark matter density. We show that low-fine
tuned points fall in the region of gaugino mass ratios predicted by specific
unified and string models. For the case of the MSSM the minimum fine tuning is
still large, approximately 1:60 allowing for a 3 GeV uncertainty in the Higgs
mass (1:500 for the central value), but for the GNMSSM it is below 1:20. We
find that the spectrum of SUSY states corresponding to the low-fine tuned
points in the GNMSSM is often compressed, weakening the LHC bounds on coloured
states. The prospect for testing the remaining low-fine-tuned regions at LHC14
is discussed.Comment: 18 page | Non-universal gaugino masses and fine tuning implications for SUSY
searches in the MSSM and the GNMSSM | non-universal gaugino masses and fine tuning implications for susy searches in the mssm and the gnmssm | mssm nmssm gnmssm fine tuning allowing gaugino degenerate unification bounds susy unification requirement acceptable density. fine tuned fall gaugino unified models. mssm fine tuning allowing gnmssm susy fine tuned gnmssm compressed weakening bounds coloured states. prospect fine tuned | non_dup | [] |
24962287 | 10.1007/JHEP11(2013)211 | We analyze the most recent cosmological data, including Planck, taking into
account the possible existence of a sterile neutrino with a mass at the eV
scale indicated by short-baseline neutrino oscillations data in the 3+1
framework. We show that the contribution of local measurements of the Hubble
constant induces an increase of the value of the effective number of
relativistic degrees of freedom above the Standard Model value, giving an
indication in favor of the existence of sterile neutrinos and their
contribution to dark radiation. Furthermore, the measurements of the local
galaxy cluster mass distribution favor the existence of sterile neutrinos with
eV-scale masses, in agreement with short-baseline neutrino oscillations data.
In this case there is no tension between cosmological and short-baseline
neutrino oscillations data, but the contribution of the sterile neutrino to the
effective number of relativistic degrees of freedom is likely to be smaller
than one. Considering the Dodelson-Widrow and thermal models for the
statistical cosmological distribution of sterile neutrinos, we found that in
the Dodelson-Widrow model there is a slightly better compatibility between
cosmological and short-baseline neutrino oscillations data and the required
suppression of the production of sterile neutrinos in the early Universe is
slightly smaller.Comment: 12 pages; final version published in JHEP 1311 (2013) 21 | Light Sterile Neutrinos in Cosmology and Short-Baseline Oscillation
Experiments | light sterile neutrinos in cosmology and short-baseline oscillation experiments | analyze cosmological planck sterile oscillations framework. hubble induces relativistic freedom giving indication favor sterile neutrinos radiation. favor sterile neutrinos oscillations data. tension cosmological oscillations sterile relativistic freedom one. dodelson widrow cosmological sterile neutrinos dodelson widrow compatibility cosmological oscillations suppression sterile neutrinos universe pages jhep | non_dup | [] |
24970469 | 10.1007/JHEP11(2013)214 | In the pure spinor formalism for the superstring, the b-ghost is a composite
operator satisfying {Q,b}=T where Q is the pure spinor BRST operator and T is
the holomorphic stress tensor. The b-ghost is holomorphic in a flat
target-space background, but it is not holomorphic in a generic curved
target-space background and instead satisfies $\bar\partial b$ = [Q, \Omega]
for some \Omega. In this paper, \Omega\ is explicitly constructed for the case
of an open superstring in a super-Maxwell background.Comment: 20 page | Pure Spinor b-ghost in a Super-Maxwell Background | pure spinor b-ghost in a super-maxwell background | spinor formalism superstring ghost composite satisfying spinor brst holomorphic tensor. ghost holomorphic holomorphic generic curved satisfies omega omega. omega explicitly superstring super maxwell | non_dup | [] |