97 research outputs found
Concentric Black Rings
We present new supersymmetric solutions of five-dimensional minimal
supergravity that describe concentric black rings with an optional black hole
at the common centre. Configurations of two black rings are found which have
the same conserved charges as a single rotating black hole; these black rings
can have a total horizon area less than, equal to, or greater than the black
hole with the same charges. A numerical investigation of these particular black
ring solutions suggests that they do not have closed timelike curves.Comment: 7 pages, minor alterations, typos corrected. Version to be published
in PR
On Non-extremal Instantons and Black Holes
We consider a general analysis and a specific ansatz for the study of
non-supersymmetric solutions in arbitrary dimensions and various metric
signatures. In all cases, we find that the conditions on the solutions can be
written in terms of quadratic forms involving the gauge coupling of the theory
and constants of integration associated with the scalar fields. Depending on
the signature of the metric, our analysis should provide a general framework
for finding non-extremal black holes, instantons, branes and S-branes.Comment: 19 page
Null Half-Supersymmetric Solutions in Five-Dimensional Supergravity
We classify half-supersymmetric solutions of gauged N=2, D=5 supergravity
coupled to an arbitrary number of abelian vector multiplets for which all of
the Killing spinors generate null Killing vectors. We show that there are four
classes of solutions, and in each class we find the metric, scalars and gauge
field strengths. When the scalar manifold is symmetric, the solutions
correspond to a class of local near horizon geometries recently found by
Kunduri and Lucietti.Comment: 46 pages, typos corrected and reference added. Section 7.1 has been
added: it is shown that the solutions found here correspond to a class of
solutions found in arXiv:0708.3695. Uses JHEP3.cl
General Concentric Black Rings
Supersymmetric black ring solutions of five dimensional supergravity coupled
to an arbitrary number of vector multiplets are constructed. The solutions are
asymptotically flat and describe configurations of concentric black rings which
have regular horizons with topology and no closed time-like
curves at the horizons.Comment: 8 pages, minor alterations, typos corrected. Version to be published
in PR
Non-Supersymmetric Charged Domain Walls
We present general non-supersymmtric domain wall solutions with non-trivial
scalar and gauge fields for gauged five-dimensional N=2 supergravity coupled to
abelian vector multiplets.Comment: 11 pages, one ref. added. To appear in Physics Letters
Vanishing Preons in the Fifth Dimension
We examine supersymmetric solutions of N=2, D=5 gauged supergravity coupled
to an arbitrary number of abelian vector multiplets using the spinorial
geometry method. By making use of methods developed in hep-th/0606049 to
analyse preons in type IIB supergravity, we show that there are no solutions
preserving exactly 3/4 of the supersymmetry.Comment: 19 pages, latex. Reference added, and further modification to the
introductio
Uniqueness of Five-Dimensional Supersymmetric Black Holes
A classification of supersymmetric solutions of five dimensional ungauged
supergravity coupled to arbitrary many abelian vector multiplets is used to
prove a uniqueness theorem for asymptotically flat supersymmetric black holes
with regular horizons. It is shown that the near-horizon geometries of
solutions for which the scalars and gauge field strengths are sufficiently
regular on the horizon are flat space, AdS_3 x S^2, or the near-horizon BMPV
solution. Furthermore, the only black hole which has the near-horizon BMPV
geometry for its near-horizon geometry is the solution found by Chamseddine and
Sabra.Comment: 15 pages, uses JHEP3.cls. Revised to match published version;
reference added, minor alterations to section
Einstein Weyl Structures and de Sitter Supergravity
The geometric structure of the null solutions of de Sitter D=5 gauged
supergravity coupled to vector multiplets is investigated. These solutions are
Kundt metrics, constructed from a one-parameter family of three dimensional
Gauduchon-Tod base spaces. We give examples, including the near horizon
geometries previously found in arxiv:hep-th/10122120. In addition, two special
cases are considered in detail. In the first, we consider solutions for which
the Gauduchon-Tod base space is the Berger sphere. In the second case we take
the null 1-form Killing spinor bilinear to be recurrent, so that the holonomy
of the Levi-Civita connection is contained in Sim(3).Comment: 23 page
Maximally Minimal Preons in Four Dimensions
Killing spinors of N=2, D=4 supergravity are examined using the spinorial
geometry method, in which spinors are written as differential forms. By making
use of methods developed in hep-th/0606049 to analyze preons in type IIB
supergravity, we show that there are no simply connected solutions preserving
exactly 3/4 of the supersymmetry.Comment: 18 pages. References added, comments added discussing the possibility
of discrete quotients of AdS(4) preserving 3/4 supersymmetry
Five Dimensional Minimal Supergravities and Four Dimensional Complex Geometries
We discuss the relation between solutions admitting Killing spinors of
minimal supergravities in five dimensions and four dimensional complex
geometries. In the ungauged case (vanishing cosmological constant \Lambda=0)
the solutions are determined in terms of a hyper-Kahler base space; in the
gauged case (\Lambda<0) the complex geometry is Kahler; in the de Sitter case
(\Lambda>0) the complex geometry is hyper-Kahler with torsion (HKT). In the
latter case some details of the derivation are given. The method for
constructing explicit solutions is discussed in each case.Comment: 8 pages. Contribution to the Proceedings of the Spanish Relativity
Meeting 2008 in Salamanca, Spai
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