10 research outputs found
HKT Geometry and Fake Five Dimensional Supergravity
Recent results on the relation between hyper-Kahler geometry with torsion and
solutions admitting Killing spinors in minimal de sitter supergravity are
extended to more general supergravity models with vector multiplets.Comment: 14 pages, latex. Minor typos corrected, references adde
Isometries of Half Supersymmetric Time-Like Solutions In Five Dimensions
Spinorial geometry techniques have recently been used to classify all half
supersymmetric solutions in gauged five dimensional supergravity with vector
multiplets. In this paper we consider solutions for which at least one of the
Killing spinors generates a timelike Killing vector. We obtain coordinate
transformations which considerably simplify the solutions, and in a number of
cases, we obtain explicitly some additional Killing vectors which were hidden
in the original analysis.Comment: 18 pages, typos corrected, late
All null supersymmetric backgrounds of N=2, D=4 gauged supergravity coupled to abelian vector multiplets
The lightlike supersymmetric solutions of N=2, D=4 gauged supergravity
coupled to an arbitrary number of abelian vector multiplets are classified
using spinorial geometry techniques. The solutions fall into two classes,
depending on whether the Killing spinor is constant or not. In both cases, we
give explicit examples of supersymmetric backgrounds. Among these BPS
solutions, which preserve one quarter of the supersymmetry, there are
gravitational waves propagating on domain walls or on bubbles of nothing that
asymptote to AdS_4. Furthermore, we obtain the additional constraints obeyed by
half-supersymmetric vacua. These are divided into four categories, that include
bubbles of nothing which are asymptotically AdS_4, pp-waves on domain walls,
AdS_3 x R, and spacetimes conformal to AdS_3 times an interval.Comment: 55 pages, uses JHEP3.cls. v2: Minor errors corrected, small changes
in introductio
Solutions of Minimal Four Dimensional de Sitter Supergravity
Pseudo-supersymmetric solutions of minimal , de Sitter
supergravity are classified using spinorial geometry techniques. We find three
classes of solutions. The first class of solution consists of geometries which
are fibrations over a 3-dimensional manifold equipped with a Gauduchon-Tod
structure. The second class of solution is the cosmological Majumdar-Papapetrou
solution of Kastor and Traschen, and the third corresponds to gravitational
waves propagating in the Nariai cosmology.Comment: 17 Pages. Minor correction to section 4; equation (4.21) corrected
and (old) equation (4.26) deleted; the final result is unchange
Towards cosmological black rings
We classify all pseudo-supersymmetric near horizon geometries of extremal
black holes in five dimensional de-Sitter supergravity coupled to vector
multiplets. We find that there are three types of solution. The first type
corresponds to the near-horizon geometry of extremal de Sitter BMPV black
holes, and the spatial cross-section of the horizon is topologically S^3. The
other two solutions cannot be embedded into the minimal de-Sitter supergravity
theory, and correspond to near-horizon geometries for which the spatial
cross-sections of the horizon are T^3 or S^1 * S^2.Comment: 20 pages, latex. Minor typos correcte