61 research outputs found
Comments on the symmetry of AdS solutions in String/M-theory and Killing spinor equations
It was recently pointed out in \cite{Kim:2015hya} that AdS solutions in
IIB theory enjoy an extended symmetry structure and the consistent truncation
to internal space leads to a nonlinear sigma model with target
. We continue to study the purely bosonic
effective action, and elucidate how the addition of scalar potential term still
allows Killing spinor equations in the absence of gauge fields. In particular,
the potential turns out to be a single diagonal component of the coset
representative. Furthermore, we perform a general analysis of the integrability
conditions of Killing spinor equations and establish that the effective action
can be in fact generalized to arbitrary sizes and signatures, e.g. with target
and the scalar potential expressible by a single
diagonal component of the coset representative. We also comment on a similar
construction and its generalizations of effective purely bosonic
non-linear sigma model action related to AdS in M-theory.Comment: v2: 17 pages, version published in PL
Supersymmetric AdS_6 Solutions of Type IIB Supergravity
We study the general requirement for supersymmetric AdS solutions in type
IIB supergravity. We employ the Killing spinor technique and study the
differential and algebraic relations among various Killing spinor bilinears to
find the canonical form of the solutions. Our result agrees precisely with the
work of Apruzzi et. al. \cite{Apruzzi:2014qva} which used the pure spinor
technique. We also obtained the four-dimensional theory through the dimensional
reduction of type IIB supergravity on AdS. This effective action is
essentially a nonlinear sigma model with five scalar fields parametrizing
, modified by a scalar potential
and coupled to Einstein gravity in Euclidean signature. We argue that the
scalar potential can be explained by a subgroup CSO(1,1,1)
in a way analogous to gauged supergravity.Comment: v2: 24 pages, misprints corrected, published in EPJ
Holographic duals of M5-branes on an irregularly punctured sphere
We provide explicit holographic duals of M5-branes wrapped on a sphere with one irregular puncture and one regular puncture of arbitrary type. The solutions generalise the solutions corresponding to M5-branes wrapped on a disc recently constructed by Bah-Bonetti-Minasian-Nardoni by allowing for a general choice of regular puncture. We show that the central charges, flavour central charges and conformal dimensions of BPS operators match with a class of Argyres-Douglas theory
Thermodynamics of accelerating AdS black holes from the covariant phase space
We study the charges and first law of thermodynamics for accelerating,
non-rotating black holes with dyonic charges in AdS using the covariant
phase space formalism. In order to apply the formalism to these solutions
(which are asymptotically locally AdS and admit a non-smooth conformal boundary
) we make two key improvements: 1) We relax the requirement to
impose Dirichlet boundary conditions and demand merely a well-posed variational
problem. 2) We keep careful track of the codimension-2 corner term induced by
the holographic counterterms, a necessary requirement due to the presence of
"cosmic strings" piercing . Using these improvements we are able
to match the holographic Noether charges to the Wald Hamiltonians of the
covariant phase space and derive the first law of black hole thermodynamics
with the correct "thermodynamic length'' terms arising from the strings. We
investigate the relationship between the charges imposed by supersymmetry and
show that our first law can be consistently applied to various classes of
non-supersymmetric solutions for which the cross-sections of the horizon are
spindles.Comment: 42 pages, 1 figur
D4-branes wrapped on four-dimensional orbifolds through consistent truncation
We construct a consistent truncation of six-dimensional matter coupled F(4) gauged supergravity on a cornucopia of two-dimensional surfaces including a spindle, disc, domain wall and other novel backgrounds to four-dimensional minimal gauged supergravity. Using our consistent truncation we uplift known AdS2 × Σ1 solutions giving rise to four-dimensional orbifold solutions, AdS2 × Σ1 ⋉ Σ2. We further uplift our solutions to massive type IIA supergravity by constructing the full uplift formulae for six-dimensional U(1)2-gauged supergravity including all fields and arbitrary Romans mass and gauge coupling. The solutions we construct are naturally interpreted as the near-horizon geometries of asymptotically AdS6 black holes with a four-dimensional orbifold horizon. Alternatively, one may view them as the holographic duals of superconformal quantum mechanical theories constructed by compactifying five-dimensional USp(2N) theory living on a stack of D4-D8 branes on the four-dimensional orbifolds. As a first step to identifying these quantum mechanical theories we compute the Bekenstein-Hawking entropy holographically
Four new species of the genus Xynobius Foerster (Hymenoptera, Braconidae, Opiinae) from South Korea
Four new species, Xynobius azonius sp. nov., X. brevifemora sp. nov., X. duoferus sp. nov., and X. stipitoides sp. nov., are described and illustrated, and one species X. geniculatus (Thomson, 1895) is newly reported from South Korea. Xynobius geniculatus (Thomson, 1895) is redescribed and illustrated, and a new combination, Xynobius (Stigmatopoea) cubitalis (Fischer, 1959), comb. nov. is suggested. An identification key to the Xynobius species known from South Korea is provided
1/4-BPS M-theory bubbles with SO(3) x SO(4) symmetry
In this paper we generalize the work of Lin, Lunin and Maldacena on the
classification of 1/2-BPS M-theory solutions to a specific class of 1/4-BPS
configurations. We are interested in the solutions of 11 dimensional
supergravity with symmetry, and it is shown that such
solutions are constructed over a one-parameter familiy of 4 dimensional almost
Calabi-Yau spaces. Through analytic continuations we can obtain M-theory
solutions having or factors. It is shown
that our result is equivalent to the solutions which have been recently
reported as the near-horizon geometry of M2 or M5-branes wrapped on 2 or
4-cycles in Calabi-Yau threefolds. We also discuss the hierarchy of M-theory
bubbles with different number of supersymmetries.Comment: 22 pages, JHEP3.cls; v2. revised version. showed that our results
agree with previous works hep-th/0605146 and hep-th/061219
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