396 research outputs found
Near horizon data and physical charges of extremal AdS black holes
We compute the physical charges and discuss the properties of a large class
of five-dimensional extremal AdS black holes by using the near horizon data.
Our examples include baryonic and electromagnetic black branes, as well as
supersymmetric spinning black holes. In the presence of the gauge Chern-Simons
term, the five-dimensional physical charges are the Page charges. We carry out
the near horizon analysis and compute the four-dimensional charges of the
corresponding black holes by using the entropy function formalism and show that
they match the Page charges.Comment: 1+19 page
Black holes in -defomed gauged supergravity
Motivated by the recently found 4-dimensional omega-deformed gauge
supergravity, we investigate the black hole solutions within all the single
scalar field consistent truncations of this theory. We construct black hole
solutions that have spherical, toroidal, and hyperbolic horizon topology. The
scalar field is regular everywhere outside the curvature singularity and the
stress-energy tensor satisfies the null energy condition. When the parameter
omega does not vanish, there is a degeneracy in the spectrum of black hole
solutions for boundary conditions that preserve the asymptotic Anti-de Sitter
symmetries. These boundary conditions correspond to multi-trace deformations in
the dual field theory.Comment: 9 pages, no figures; v2: refs. added, typos fixe
Hairy AdS Solitons
We construct exact hairy AdS soliton solutions in Einstein-dilaton gravity
theory. We examine their thermodynamic properties and discuss the role of these
solutions for the existence of first order phase transitions for hairy black
holes. The negative energy density associated to hairy AdS solitons can be
interpreted as the Casimir energy that is generated in the dual filed theory
when the fermions are antiperiodic on the compact coordinate.Comment: 12 pages, no figures; v2: small changes and fixed typo
(Un)attractor black holes in higher derivative AdS gravity
We investigate five-dimensional static (non-)extremal black hole solutions in
higher derivative Anti-de Sitter gravity theories with neutral scalars
non-minimally coupled to gauge fields. We explicitly identify the boundary
counterterms to regularize the gravitational action and the stress tensor. We
illustrate these results by applying the method of holographic renormalization
to computing thermodynamical properties in several concrete examples. We also
construct numerical extremal black hole solutions and discuss the attractor
mechanism by using the entropy function formalism.Comment: 30 pages, 4 figures; V2: comments on holographic renormalization
method and ack. added, misprints corrected, expanded reference
Hairy Black Hole Stability in AdS, Quantum Mechanics on the Half-Line and Holography
We consider the linear stability of -dimensional hairy black holes with
mixed boundary conditions in Anti-de Sitter spacetime. We focus on the mass of
scalar fields around the maximally supersymmetric vacuum of the gauged
supergravity in four dimensions, . It is shown
that the Schr\"{o}dinger operator on the half-line, governing the ,
or invariant mode around the hairy black hole, allows
for non-trivial self-adjoint extensions and each of them correspons to a class
of mixed boundary conditions in the gravitational theory. Discarding the
self-adjoint extensions with a negative mode impose a restriction on these
boundary conditions. The restriction is given in terms of an integral of the
potential in the Schr\"{o}dinger operator resembling the estimate of Simon for
Schr\"{o}dinger operators on the real line. In the context of AdS/CFT duality,
our result has a natural interpretation in terms of the field theory dual
effective potential.Comment: 13 pages, no figures, references added, matches published versio
Higher dimensional Kaluza-Klein Monopoles
It is well known that the Kaluza-Klein monopole of Sorkin, Gross and Perry
can be obtained from the Euclidean Taub-NUT solution with an extra compact
fifth spatial dimension via Kaluza-Klein reduction. In this paper we consider
Taub-NUT-like solutions of the vacuum Einstein field equations, with or without
cosmological constant, in five dimensions and higher, and similarly perform
Kaluza-Klein reductions to obtain new magnetic KK brane solutions in higher
dimensions, as well as further sphere reductions to magnetic monopoles in four
dimensions. In six dimensions we also employ spatial and timelike Hopf
dualities to untwist the circle fibration characteristic to these spaces and
obtain charged strings. A variation of these methods in ten dimensions leads to
a non-uniform electric string in five-dimensions.Comment: 28 pages, Latex, v.2 Typos corrected, references added. To appear in
Nucl. Phys.
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