310 research outputs found
Fully Localized Brane Intersections - The Plot Thickens
We study fully localized BPS brane solutions in classical supergravity using
a perturbative approach to the coupled Born-Infeld/bulk supergravity system. We
derive first order bulk supergravity fields for world-volume solitons
corresponding to intersecting M2-branes and to a fundamental string ending on a
D3-brane. One interesting feature is the appearance of certain off-diagonal
metric components and corresponding components of the gauge potentials. Making
use of a supersymmetric ansatz for the exact fields, we formulate a
perturbative expansion which applies to and
intersections. We find that perturbation theory
qualitatively distinguishes between certain of these cases: perturbation theory
breaks down at second order for intersecting M2-branes and D-branes with
while it is well behaved, at least to this order, for the remaining
cases. This indicates that the behavior of the full non-linear intersecting
Dp-brane solutions may be qualitatively different for than for , and that fully localized asymptotically flat solutions for may
not exist. We discuss the consistency of these results with world-volume field
theory properties.Comment: 27 pages, Plain Tex, 1 figure, added references, numerical factors
correcte
The flat limit of three dimensional asymptotically anti-de Sitter spacetimes
In order to get a better understanding of holographic properties of
gravitational theories with a vanishing cosmological constant, we analyze in
detail the relation between asymptotically anti-de Sitter and asymptotically
flat spacetimes in three dimensions. This relation is somewhat subtle because
the limit of vanishing cosmological constant cannot be naively taken in
standard Fefferman-Graham coordinates. After reformulating the standard anti-de
Sitter results in Robinson-Trautman coordinates, a suitably modified Penrose
limit is shown to connect both asymptotic regimes.Comment: 11 pages revtex fil
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