194 research outputs found
Supersymmetric Probes in a Rotating 5D Attractor
Supersymmetric zero-brane and one-brane probes in the squashed near-horizon geometry of the BMPV black hole are studied. Supersymmetric
zero-brane probes stabilized by orbital angular momentum on the are found
and shown to saturate a BPS bound. We also find supersymmetric one-brane probes
which have momentum and winding around a torus in the
and in some cases are static.Comment: 13 page
Supersymmetric Brane-Worlds
We present warped metrics which solve Einstein equations with arbitrary
cosmological constants in both in upper and lower dimensions. When the
lower-dimensional metric is the maximally symmetric one compatible with the
chosen value of the cosmological constant, the upper-dimensional metric is also
the maximally symmetric one and there is maximal unbroken supersymmetry as
well. We then introduce brane sources and find solutions with analogous
properties, except for supersymmetry, which is generically broken in the
orbifolding procedure (one half is preserved in two special cases), and analyze
metric perturbations in these backgrounds In analogy with the D8-brane we
propose an effective -brane action which acts as a source for the
RS solution. The action consists of a Nambu-Goto piece and a Wess-Zumino term
containing a -form field. It has the standard form of the action
for a BPS extended object, in correspondence with the supersymmetry preserved
by the solution.Comment: 13 pages, Latex2e. Corrected and shortened version to appear in Phys.
Lett.
Curved dilatonic brane-worlds and the cosmological constant problem
We construct a model for dilatonic brane worlds with constant curvature on
the brane, i.e. a non-zero four-dimensional cosmological constant, given in
function of the dilaton coupling and the cosmological constant of the bulk. We
compare this family of solutions to other known dilatonic domain wall solutions
and apply a self-tunning mechanism to check the stability of our solutions
under quantum fluctuations living on the brane.Comment: latex, 6 pages. (v2): considerable changes in the conclusion. (v3):
added new discussion on the solutions and some references; version to appear
in CQ
The Near-Horizon Limit of the Extreme Rotating d=5 Black Hole as a Homogenous Spacetime
We show that the spacetime of the near-horizon limit of the extreme rotating
d=5 black hole, which is maximally supersymmetric in N=2,d=5 supergravity for
any value of the rotation parameter j in [-1,1], is locally isomorphic to a
homogeneous non-symmetric spacetime corresponding to an element of the
1-parameter family of coset spaces SO(2,1)x SO(3)/SO(2)_j in which the subgroup
SO(2)_j is a combination of the two SO(2) subgroups of SO(2,1) and SO(3).Comment: Some points clarified and misprints corrected. Version to be
published in Classical and Quantum Gravit
E11 and Spheric Vacuum Solutions of Eleven- and Ten dimensional Supergravity Theories
In view of the newly conjectured Kac-Moody symmetries of supergravity
theories placed in eleven and ten dimensions, the relation between these
symmetry groups and possible compactifications are examined. In particular, we
identify the relevant group cosets that parametrise the vacuum solutions of AdS
x S type.Comment: discussion improve
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Wrapped M2/M5 Duality
A microscopic accounting of the entropy of a generic 5D supersymmetric
rotating black hole, arising from wrapped M2-branes in Calabi-Yau compactified
M-theory, is an outstanding unsolved problem. In this paper we consider an
expansion around the zero-entropy, zero-temperature, maximally rotating ground
state for which the angular momentum J_L and graviphoton charge Q are related
by J_L^2=Q^3. At J_L=0 the near horizon geometry is AdS_2 x S^3. As J_L^2 goes
to Q^3 it becomes a singular quotient of AdS_3 x S^2: more precisely, a
quotient of the near horizon geometry of an M5 wrapped on a 4-cycle whose
self-intersection is the 2-cycle associated to the wrapped-M2 black hole. The
singularity of the AdS_3 quotient is identified as the usual one associated to
the zero-temperature limit, suggesting that the (0,4) wrapped-M5 CFT is dual
near maximality to the wrapped-M2 black hole. As evidence for this, the
microscopic (0,4) CFT entropy and the macroscopic rotating black hole entropy
are found to agree to leading order away from maximality.Comment: 10 pages, no figure
Central Charge for AdS_2 Quantum Gravity
Two-dimensional Maxwell-dilaton quantum gravity on AdS_2 with radius
and a constant electric field E is studied. In conformal gauge, this is
equivalent to a CFT on a strip. In order to maintain consistent boundary
conditions, the usual conformal diffeomorphisms must be accompanied by a
certain U(1) gauge transformation. The resulting conformal transformations are
generated by a twisted stress tensor, which has a central charge where k is the level of the U(1) current. This is an AdS_2 analog of
the Brown-Henneaux formula for the central charge of quantum
gravity on AdS_3
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