pinecone/core-2020-05-10-deduplication huggingface dataset:
Viscous asymptotically flat Reissner-Nordström black branes

We study electrically charged asymptotically flat black brane solutions whose world-volume fields are slowly varying with the coordinates. Using familiar techniques, we compute the transport coefficients of the fluid dynamic derivative expansion to first order. We show how the shear and bulk viscosities are modified in the presence of electric charge and we compute the charge diffusion constant which is not present for the neutral black p -brane. We compute the first order dispersion relations of the effective fluid. For small values of the charge the speed of sound is found to be imaginary and the brane is thus Gregory-Laflamme unstable as expected. For sufficiently large values of the charge, the sound mode becomes stable, however, in this regime the hydrodynamic mode associated with charge diffusion is found to be unstable. The electrically charged brane is thus found to be (classically) unstable for all values of the charge density in agreement with general thermodynamic arguments. Finally, we show that the shear viscosity to entropy bound is saturated, as expected, while the proposed bounds for the bulk viscosity to entropy can be violated in certain regimes of the charge of the brane
A Note On 3D N=2 Dualities: Real Mass Flow And Partition Function

We study two well-known classes of dualities in three dimensional N=2
supersymmetric field theories. In the first class there are non trivial
interactions involving monopole operators while in the second class the dual
gauge theories have Chern-Simons terms in the action. An RG flows connecting
the first dual pair to the second one has been studied in the past and tested
on the partition function on the squashed three sphere. Recently an opposite RG
flow connecting the second dual pair to the first one has been studied in the
case of unitary gauge groups. In this paper we study this flow on the partition
function on the squashed three sphere. We verify that the equality between the
partition functions of the original dual models is preserved in the IR, where
the other dual pair is reached. We generalize the analysis to the case of
symplectic and of orthogonal groups.Comment: 25 page
New Algorithm and Phase Diagram of Noncommutative Phi**4 on the Fuzzy
  Sphere

We propose a new algorithm for simulating noncommutative phi-four theory on
the fuzzy sphere based on, i) coupling the scalar field to a U(1) gauge field,
in such a way that in the commutative limit N\longrightarrow \infty, the two
modes decouple and we are left with pure scalar phi-four on the sphere, and ii)
diagonalizing the scalar field by means of a U(N) unitary matrix, and then
integrating out the unitary group from the partition function. The number of
degrees of freedom in the scalar sector reduces, therefore, from N^2 to the N
eigenvalues of the scalar field, whereas the dynamics of the U(1) gauge field,
is given by D=3 Yang-Mills matrix model with a Myers term. As an application,
the phase diagram, including the triple point, of noncommutative phi-four
theory on the fuzzy sphere, is reconstructed with small values of N up to N=10,
and large numbers of statistics.Comment: 29 pages,9 figures, 4 tables, v2: new section added in which we
  compare briefly between the different algorithms,30 pages, v3:two figures
  added, one equation added, various comments added throughout the article,
  typos corrected, writing style improved, 33 page
Generalized entropy and higher derivative Gravity

We derive an extension of the Ryu-Takayanagi prescription for curvature
squared theories of gravity in the bulk, and comment on a prescription for more
general theories. This results in a new entangling functional, that contains a
correction to Wald's entropy. The new term is quadratic in the extrinsic
curvature. The coefficient of this correction is a second derivative of the
lagrangian with respect to the Riemann tensor. For Gauss-Bonnet gravity, the
new functional reduces to Jacobson-Myers'.Comment: v4: further sign corrections in sec 2, main conclusions unaltered.
  Added comments comparing to Iyer-Wald's in section 5. Version to appear in
  JHE
Jet quenching and holographic thermalization with a chemical potential

We investigate jet quenching of virtual gluons and thermalization of a strongly-coupled plasma with a non-zero chemical potential via the gauge/gravity duality. By tracking a charged shell falling in an asymptotic AdS d +1 background for d = 3 and d = 4, which is characterized by the AdS-Reissner-Nordström-Vaidya (AdS-RN-Vaidya) geometry, we extract a thermalization time of the medium with a non-zero chemical potential. In addition, we study the falling string as the holographic dual of a virtual gluon in the AdS-RN-Vaidya spacetime. The stopping distance of the massless particle representing the tip of the falling string in such a spacetime could reveal the jet quenching of an energetic light probe traversing the medium in the presence of a chemical potential. We find that the stopping distance decreases when the chemical potential is increased in both AdS-RN and AdS-RN-Vaidya spacetimes, which correspond to the thermalized and thermalizing media respectively. Moreover, we find that the soft gluon with an energy comparable to the thermalization temperature and chemical potential in the medium travels further in the non-equilibrium plasma. The thermalization time obtained here by tracking a falling charged shell does not exhibit, generically, the same qualitative features as the one obtained studying non-local observables. This indicates that — holographically — the definition of thermalization time is observer dependent and there is no unambiguos definition
Fermionic UV completions of Composite Higgs models

We classify the four-dimensional purely fermionic gauge theories that give a
UV completion of composite Higgs models. Our analysis is at the group
theoretical level, addressing the necessary (but not sufficient) conditions for
the viability of these models, such as the existence of top partners and
custodial symmetry. The minimal cosets arising are those of type SU(5)/SO(5)
and SU(4)/Sp(4). We list all the possible "hyper-color" groups allowed and
point out the simplest and most promising ones.Comment: 15 pages, 4 tables; V2 Comments and references added. To appear in
  JHEP. V3 Coset of type $SU(4)\times SU(4)'/SU(4)_D$ added to the
  classificatio
2d index and surface operators

In this paper we compute the superconformal index of 2d (2, 2) supersymmetric gauge theories. The 2d superconformal index, a.k.a. flavored elliptic genus, is computed by a unitary matrix integral much like the matrix integral that computes the 4d superconformal index. We compute the 2d index explicitly for a number of examples. In the case of abelian gauge theories we see that the index is invariant under flop transition and under CY-LG correspondence. The index also provides a powerful check of the Seiberg-type duality for non-abelian gauge theories discovered by Hori and Tong
Exploring the three flavor effects with future superbeams using liquid argon detectors

Recent measurement of a moderately large value of θ 13 signifies an important breakthrough in establishing the standard three flavor oscillation picture of neutrinos. It has provided an opportunity to explore the sub-dominant three flavor effects in present and future long-baseline experiments. In this paper, we perform a comparative study of the physics reach of two future superbeam facilities, LBNE and LBNO in their first phases of run, to resolve the issues of neutrino mass hierarchy, octant of θ 23 , and leptonic CP violation. We also find that the sensitivity of these future facilities can be improved significantly by adding the projected data from T2K and NO ν A. Stand-alone LBNO setup with a 10 kt detector has a mass hierarchy discovery reach of more than 7 σ , for the lowest allowed value of sin 2 θ 23 (true) = 0.34. This result is valid for any choice of true δ CP and hierarchy. LBNE10, in combination with T2K and NO ν A, can achieve 3 σ hierarchy discrimination for any choice of δ CP , sin 2 θ 23 , and hierarchy. The same combination can provide a 3 σ octant resolution for sin 2 θ 23 (true) ≤ 0.44 or for sin 2 θ 23 (true) ≥ 0.58 for all values of δ CP (true). LBNO can give similar results with 10 kt detector mass. In their first phases, both LBNE10 and LBNO with 20 kt detector can establish leptonic CP violation for around 50% values of true δ CP at 2 σ confidence level. In case of LBNE10, CP coverage at 3 σ can be enhanced from 3% to 43% by combining T2K and NO ν A data, assuming sin 2 θ 23 (true) = 0.5. For LBNO setup, CP violation discovery at 3 σ is possible for 46% values of true δ CP if we add the data from T2K and NO ν A
N=2 supersymmetric gauge theories and quantum integrable systems

We study N=2 supersymmetric gauge theories on the product of a two-sphere and
a cylinder. We show that the low-energy dynamics of a BPS sector of such a
theory is described by a quantum integrable system, with the Planck constant
set by the inverse of the radius of the sphere. If the sphere is replaced with
a hemisphere, then our system reduces to an integrable system of the type
studied by Nekrasov and Shatashvili. In this case we establish a correspondence
between the effective prepotential of the gauge theory and the Yang-Yang
function of the integrable system.Comment: 24 pages. v2: references added; v3: minor changes, published versio
The local potential approximation in the background field formalism

Working within the familiar local potential approximation, and concentrating on the example of a single scalar field in three dimensions, we show that the commonly used approximation method of identifying the total and background fields, leads to pathologies in the resulting fixed point structure and the associated spaces of eigenoperators. We then show how a consistent treatment of the background field through the corresponding modified shift Ward identity, can cure these pathologies, restoring universality of physical quantities with respect to the choice of dependence on the background field, even within the local potential approximation. Along the way we point out similarities to what has been previously found in the f ( R ) approximation in asymptotic safety for gravity
Soft RPV through the baryon portal

Supersymmetric (SUSY) models with R -parity generically predict sparticle decays with invisible neutralinos, which yield distinctive missing energy events at colliders. Since most LHC searches are designed with this expectation, the putative bounds on sparticle masses become considerably weaker if R -parity is violated so that squarks and gluinos decay to jets with large QCD backgrounds. Here we introduce a scenario in which baryonic R -parity violation (RPV) arises effectively from soft SUSY breaking interactions, but leptonic RPV remains accidentally forbidden to evade constraints from proton decay and FCNCs. The model features a global R -symmetry that initially forbids RPV interactions, a hidden R -breaking sector, and a heavy mediator that communicates this breaking to the visible sector. After R -symmetry breaking, the mediator is integrated out and an effective RPV A -term arises at tree level; RPV couplings between quarks and squarks arise only at loop level and receive additional suppression. Although this mediator must be heavy compared to soft masses, the model introduces no new hierarchy since viable RPV can arise when the mediator mass is near the SUSY breaking scale. In generic regions of parameter space, a light thermally-produced gravitino is stable and can be a viable dark matter candidate
Muon g-2 and LHC phenomenology in the L μ − L τ gauge symmetric model

In this paper, we consider phenomenology of a model with an L μ − L τ gauge symmetry. Since the muon couples to the L μ − L τ gauge boson (called Z ″ boson), its contribution to the muon anomalous magnetic moment (muon g-2) can account for the discrepancy between the standard model prediction and the experimental measurements. On the other hand, the Z ″ boson does not interact with the electron and quarks, and hence there are no strong constraints from collider experiments even if the Z ″ boson mass is of the order of the electroweak scale. We show an allowed region of a parameter space in the L μ − L τ symmetric model, taking into account consistency with the electroweak precision measurements as well as the muon g-2. We study the Large Hadron Collider (LHC) phenomenology, and show that the current and future data would probe the interesting parameter space for this model
5-Brane Webs, Symmetry Enhancement, and Duality in 5d Supersymmetric
  Gauge Theory

We present a number of investigations of 5d ${\cal N}=1$ supersymmetric gauge
theories that make use of 5-brane web constructions and the 5d superconformal
index. These include an observation of enhanced global symmetry in the 5d fixed
point theory corresponding to $SU(N)$ gauge theory with Chern-Simons level $\pm
N$, enhanced global symmetries in quiver theories, and dualities between quiver
theories and non-quiver theories. Instanton contributions play a crucial role
throughout.Comment: 50 pages, 36 figures; Typos corrected. Version published in JHE
Free boundary conditions and the AdS$_3$/CFT$_2$ correspondence

We show that the recently proposed free boundary conditions for AdS$_3$ are
dual to two-dimensional quantum gravity in certain fixed gauges. In particular,
we note that an appropriate identification of the generator of Virasoro
transformations leads to a vanishing total central charge in agreement with the
theory at the boundary. We argue that this identification is necessary to match
the bulk and boundary generators of Virasoro transformations and for
consistency with the constraint equations.Comment: 27 pages; v2: corrected sign of Kac-Moody level, added comments on
  unitarity of the dual theory, added references, published versio
A universal feature of CFT Renyi entropy

We show that for a d-dimensional CFT in flat space, the Renyi entropy S_q
across a spherical entangling surface has the following property: in an
expansion around q=1, the first correction to the entanglement entropy is
proportional to C_T, the coefficient of the stress tensor vacuum two-point
function, with a fixed d-dependent coefficient. This is equivalent to a similar
statement about the free energy of CFTs living on S^1 x H^{d-1} with inverse
temperature \beta=2\pi q. In addition to furnishing a direct argument
applicable to all CFTs, we exhibit this result using a handful of gravity and
field theory computations. Knowledge of C_T thus doubles as knowledge of Renyi
entropies in the neighborhood of q=1, which we use to establish new results in
3d vector models at large N.Comment: 19 pages + refs; v3: minor revision
Coarse-grained entropy and causal holographic information in AdS/CFT

We propose bulk duals for certain coarse-grained entropies of boundary
regions. The `one-point entropy' is defined in the conformal field theory by
maximizing the entropy in a domain of dependence while fixing the one-point
functions. We conjecture that this is dual to the area of the edge of the
region causally accessible to the domain of dependence (i.e. the `causal
holographic information' of Hubeny and Rangamani). The `future one-point
entropy' is defined by generalizing this conjecture to future domains of
dependence and their corresponding bulk regions. We show that the future
one-point entropy obeys a nontrivial second law. If our conjecture is true,
this answers the question "What is the field theory dual of Hawking's area
theorem?"Comment: 43 pages, 9 figures. v3: minor changes suggested by referee v2: added
  a few additional reference
Jet Veto Clustering Logarithms Beyond Leading Order

Many experimental analyses separate events into exclusive jet bins, using a
jet algorithm to cluster the final state and then veto on jets. Jet clustering
induces logarithmic dependence on the jet radius R in the cross section for
exclusive jet bins, a dependence that is poorly controlled due to the
non-global nature of the clustering. At jet radii of experimental interest, the
leading order (LO) clustering effects are numerically significant, but the
higher order effects are currently unknown. We rectify this situation by
calculating the most important part of the next-to-leading order (NLO)
clustering logarithms of R for any 0-jet process, which enter as
$O(\alpha_s^3)$ corrections to the cross section. The calculation blends
subtraction methods for NLO calculations with factorization properties of QCD
and soft-collinear effective theory (SCET). We compare the size of the known LO
and new NLO clustering logarithms and find that the impact of the NLO terms on
the 0-jet cross section in Higgs production is small. This brings clustering
effects under better control and may be used to improve uncertainty estimates
on cross sections with a jet veto.Comment: 39 pages, 5 figures. v2: journal version. v3: added missing term in
  calculation, conclusions unchange
Classical torus conformal block, N=2* twisted superpotential and the
  accessory parameter of Lame equation

In this work the correspondence between the semiclassical limit of the DOZZ
quantum Liouville theory on the torus and the Nekrasov-Shatashvili limit of the
N=2* (Omega-deformed) U(2) super-Yang-Mills theory is used to propose new
formulae for the accessory parameter of the Lame equation. This quantity is in
particular crucial for solving the problem of uniformization of the
one-punctured torus. The computation of the accessory parameters for torus and
sphere is an open longstanding problem which can however be solved if one
succeeds to derive an expression for the so-called classical Liouville action.
The method of calculation of the latter has been proposed some time ago by
Zamolodchikov brothers. Studying the semiclassical limit of the four-point
function of the quantum Liouville theory on the sphere they have derived the
classical action for the Riemann sphere with four punctures. In the present
work Zamolodchikovs idea is exploited in the case of the Liouville field theory
on the torus. It is found that the Lame accessory parameter is determined by
the classical Liouville action on the one-punctured torus or more concretely by
the torus classical block evaluated on the saddle point intermediate classical
weight. Secondly, as an implication of the aforementioned correspondence it is
obtained that the torus accessory parameter is related to the sum of all
rescaled column lengths of the so-called "critical" Young diagrams extremizing
the instanton "free energy" for the N=2* gauge theory. Finally, it is pointed
out that thanks to the known relation the sum over the "critical" column
lengths can be expressed in terms of a contour integral in which the integrand
is built out of certain special functions.Comment: 41 pages, published versio
Worldsheet Description of Exotic Five-brane with Two Gauged Isometries

We study the string worldsheet description of the background geometry of the
exotic $5^2_2$-brane where two isometries are gauged. This is an extension of
the gauged linear sigma model (GLSM) for the exotic $5^2_2$-brane with a single
gauged isometry. The new GLSM with two gauged isometries has only ${\mathcal
N}=(2,2)$ supersymmetry rather than ${\mathcal N}=(4,4)$ supersymmetry of the
original GLSM. This is caused by a conflict between two different $SU(2)_R$
associated with the two gauge symmetries. However, if we take a certain limit,
we can find the genuine string sigma model of the background geometry of the
exotic $5^2_2$-brane with ${\mathcal N}=(4,4)$ supersymmetry. We also
investigate the worldsheet instanton corrections to the background geometry of
the exotic $5^2_2$-brane. The worldsheet instanton corrections to the string
sigma model can be traced in terms of the two gauge fields in the new GLSM.
This new GLSM gives rise to a different feature of the quantum corrections from
the one in the GLSM with the single gauged isometry.Comment: 32 pages, accepted version in JHE
Entanglement entropy on the fuzzy sphere

We obtain entanglement entropy on the noncommutative (fuzzy) two-sphere. To
define a subregion with a well defined boundary in this geometry, we use the
symbol map between elements of the noncommutative algebra and functions on the
sphere. We find that entanglement entropy is not proportional to the length of
the region's boundary. Rather, in agreement with holographic predictions, it is
extensive for regions whose area is a small (but fixed) fraction of the total
area of the sphere. This is true even in the limit of small noncommutativity.
We also find that entanglement entropy grows linearly with N, where N is the
size of the irreducible representation of SU(2) used to define the fuzzy
sphere.Comment: 18 pages, 7 figures. v3 to appear in JHEP. Clarified statements about
  UV/IR mixing and interpretation in terms of degrees of freedom on the fuzzy
  sphere vs. matrix degrees of freedom, fixed some typos and added reference
The holography of F -maximization

We find new supersymmetric backgrounds of $ \mathcal{N} $ = 8 gauged supergravity in four Euclidean dimensions that are dual to deformations of ABJM theory on S 3 . The deformations encode the most general choice of U(1) R symmetry used to define the theory on S 3 . We work within an $ \mathcal{N} $ = 2 truncation of the $ \mathcal{N} $ = 8 supergravity theory obtained via a group theory argument. We find perfect agreement between the S 3 free energy computed from our supergravity backgrounds and the previous field theory computations of the same quantity based on supersymmetric localization and matrix model techniques
Topology and $\theta$ dependence in finite temperature $G_2$ lattice
  gauge theory

In this work we study the topological properties of the $G_2$ lattice gauge
theory by means of Monte Carlo simulations. We focus on the behaviour of
topological quantities across the deconfinement transition and investigate
observables related to the $\theta$ dependence of the free energy. As in
$SU(N)$ gauge theories, an abrupt change happens at deconfinement and an
instanton gas behaviour rapidly sets in for $T>T_c$.Comment: 11 pages, 8 eps figures (typos corrected in eq.2.5 and 2.7 with
  respect to the published version
Self-Dual Tensors and Partial Supersymmetry Breaking in Five Dimensions

We study spontaneous supersymmetry breaking of five-dimensional supergravity
theories from sixteen to eight supercharges in Minkowski vacua. This N=4 to N=2
breaking is induced by Abelian gaugings that require the introduction of
self-dual tensor fields accompanying the vectors in the gravity multiplet and
vector multiplets. These tensor fields have first-order kinetic terms and can
become massive by a Stueckelberg-like mechanism. We identify the general class
of N=2 vacua and show how the N=4 spectrum splits into massless and massive N=2
multiplets. In particular, we find a massive gravitino multiplet, containing
two complex massive tensors, and a number of massive tensor multiplets and
hypermultiplets. We determine the resulting N=2 effective action for the
massless multiplets obtained by integrating out massive fields. We show that
the metric and Chern-Simons terms of the vectors are corrected at one-loop by
massive tensors as well as spin-1/2 and spin-3/2 fermions. These contributions
are independent of the supersymmetry-breaking scale and thus have to be
included at arbitrarily low energies.Comment: 33 page