532 research outputs found
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
Superconformal field theories from crystal lattices
We propose a brane configuration for the (2+1)d,
superconformal theories (CFT) arising from M2-branes probing toric
Calabi-Yau 4-fold cones, using a T-duality transformation of M-theory. We
obtain intersections of M5-branes on a three-torus which form a 3d bipartite
crystal lattice in a way similar to the 2d dimer models for CFT. The
fundamental fields of the CFT are M2-brane discs localized around the
intersections, and the super-potential terms are identified with the atoms of
the crystal. The model correctly reproduces the complete BPS spectrum of mesons
and baryons.Comment: 4 pages, 4 figures, revtex; v2. references added, minor correction
The Geometry of D=11 Null Killing Spinors
We determine the necessary and sufficient conditions on the metric and the
four-form for the most general bosonic supersymmetric configurations of D=11
supergravity which admit a null Killing spinor i.e. a Killing spinor which can
be used to construct a null Killing vector. This class covers all
supersymmetric time-dependent configurations and completes the classification
of the most general supersymmetric configurations initiated in hep-th/0212008.Comment: 30 pages, typos corrected, reference added, new solution included in
section 5.1; uses JHEP3.cl
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
Beyond LLM in M-theory
The Lin, Lunin, Maldacena (LLM) ansatz in D = 11 supports two independent
Killing directions when a general Killing spinor ansatz is considered. Here we
show that these directions always commute, identify when the Killing spinors
are charged, and show that both their inner product and resulting geometry are
governed by two fundamental constants. In particular, setting one constant to
zero leads to AdS7 x S4, setting the other to zero gives AdS4 x S7, while flat
spacetime is recovered when both these constants are zero. Furthermore, when
the constants are equal, the spacetime is either LLM, or it corresponds to the
Kowalski-Glikman solution where the constants are simply the mass parameter.Comment: 1+30 pages, footnote adde
Supersymmetric black rings and three-charge supertubes
We present supergravity solutions for 1/8-supersymmetric black supertubes
with three charges and three dipoles. Their reduction to five dimensions yields
supersymmetric black rings with regular horizons and two independent angular
momenta. The general solution contains seven independent parameters and
provides the first example of non-uniqueness of supersymmetric black holes. In
ten dimensions, the solutions can be realized as D1-D5-P black supertubes. We
also present a worldvolume construction of a supertube that exhibits three
dipoles explicitly. This description allows an arbitrary cross-section but
captures only one of the angular momenta.Comment: 59 pages, 6 figures; v2: minor correction
That's a wrap!
Calibration technology provides us with a fast and elegant way to find the
supergravity solutions for BPS wrapped M-branes. Its true potential had however
remained untapped due to the absence of a classification of calibrations in
spacetimes with non-trivial flux. The applications of this method were thus
limited in practise to M-branes wrapping Kahler calibrated cycles. In this
paper, we catagorize a type of generalised calibrations which exist in
supergravity backgrounds and contain Kahler calibrations as a sub-class. This
broadens the arena of brane configurations whose supergravity solutions are
accessible through the calibration 'short-cut' method.Comment: 19 pages, typos correcte
On the supersymmetries of anti de Sitter vacua
We present details of a geometric method to associate a Lie superalgebra with
a large class of bosonic supergravity vacua of the type AdS x X, corresponding
to elementary branes in M-theory and type II string theory.Comment: 16 page
Black holes in Goedel-type universes with a cosmological constant
We discuss supersymmetric black holes embedded in a Goedel-type universe with
cosmological constant in five dimensions. The spacetime is a fibration over a
four-dimensional Kaehler base manifold, and generically has closed timelike
curves. Asymptotically the space approaches a deformation of AdS_5, which
suggests that the appearance of closed timelike curves should have an
interpretation in some deformation of D=4, N=4 super-Yang-Mills theory.
Finally, a Goedel-de Sitter universe is also presented and its causal structure
is discussed.Comment: 25 pages, Latex, no figures, references updated, physical discussion
of the solutions considerably expanded, holographic stress tensor and
conserved charges of Goedel-AdS(5) solution compute
Supersymmetric AdS_5 solutions of M-theory
We analyse the most general supersymmetric solutions of D=11 supergravity
consisting of a warped product of five-dimensional anti-de-Sitter space with a
six-dimensional Riemannian space M_6, with four-form flux on M_6. We show that
M_6 is partly specified by a one-parameter family of four-dimensional Kahler
metrics. We find a large family of new explicit regular solutions where M_6 is
a compact, complex manifold which is topologically a two-sphere bundle over a
four-dimensional base, where the latter is either (i) Kahler-Einstein with
positive curvature, or (ii) a product of two constant-curvature Riemann
surfaces. After dimensional reduction and T-duality, some solutions in the
second class are related to a new family of Sasaki-Einstein spaces which
includes T^{1,1}/Z_2. Our general analysis also covers warped products of
five-dimensional Minkowski space with a six-dimensional Riemannian space.Comment: 40 pages. v2: minor changes, eqs. (2.22) and (D.12) correcte
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