158 research outputs found
D6+D0 and Five Dimensional Spinning Black Hole
We study the system of D6+D0 branes at sub-stringy scale. We show that the
proper description of the system, for large background field associated with
the D0-branes, is via spinning chargeless black holes in five dimensions. The
repulsive force between the D6-branes and the D0-branes is understood through
the centrifugal barrier. We discuss the implication on the stability of the
D6+D0 solution.Comment: 8 page
On the Hierarchy Between Non-Commutative and Ordinary Supersymmetric Yang-Mills
Non-commutative supersymmetric Yang-Mills with rational Theta is dual to an
ordinary supersymmetric Yang-Mills with a 't Hooft flux. It is believed that
the simplest description is via the ordinary supersymmetric Yang-Mills. We
claim, however, that the two descriptions form a hierarchy. The SYM description
is the proper description in the ultra violet while the non-commutative
description takes over in the infra red.Comment: 16 pages, 3 figures, references adde
Black Holes, Shock Waves, and Causality in the AdS/CFT Correspondence
We find the expectation value of the energy-momentum tensor in the CFT
corresponding to a moving black hole in AdS. Boosting the black hole to the
speed of light, keeping the total energy fixed, yields a gravitational shock
wave in AdS. The analogous procedure on the field theory side leads to ``light
cone'' states, i.e., states with energy-momentum tensor localized on the light
cone. The correspondence between the gravitational shock wave and these light
cone states provides a useful tool for testing causality. We show, in several
examples, how the CFT reproduces the causal relations in AdS.Comment: Minor corrections, references adde
Large branes in AdS and their field theory dual
Recently it was suggested that a graviton in with a large
momentum along the sphere can blow up into a spherical D-brane in . In
this paper we show that the same graviton can also blow up into a spherical
D-brane in with exactly the same quantum numbers (angular momentum and
energy). These branes are BPS, preserving 16 of the 32 supersymmetries. We show
that there is a BPS {\it classical} solution for SYM on with
exactly the same quantum numbers. The solution has non-vanishing Higgs
expectation values and hence is dual to the large brane in AdS.Comment: 20 pages, 6 figures, minor change
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