We examine the dynamics of extended branes, carrying lower-dimensional brane charges, wrapping black holes and black hole microstates in M and type II string theory. We show that they have a universal dis- persion relation typical of threshold bound states with a total energy equal to the sum of the contributions from the charges. In near-horizon geometries of black holes, these are BPS states, and the dispersion rela- tion follows from supersymmetry as well as properties of the conformal algebra. However they break all supersymmetries of the full asymptotic geometries of black holes and microstates. We comment on a recent proposal which uses these states to explain black hole entropy.
Branes wrapping black holes
GIUSTO, STEFANO;
2006-01-01
Abstract
We examine the dynamics of extended branes, carrying lower-dimensional brane charges, wrapping black holes and black hole microstates in M and type II string theory. We show that they have a universal dis- persion relation typical of threshold bound states with a total energy equal to the sum of the contributions from the charges. In near-horizon geometries of black holes, these are BPS states, and the dispersion rela- tion follows from supersymmetry as well as properties of the conformal algebra. However they break all supersymmetries of the full asymptotic geometries of black holes and microstates. We comment on a recent proposal which uses these states to explain black hole entropy.
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