Microscopic Theory of Black Hole Superradiance

Dias, Oscar J. C.; Emparan, Roberto; Maccarrone, Alessandro

Microscopic Theory of Black Hole Superradiance

Authors

Dias, Oscar J. C.

Emparan, Roberto

Maccarrone, Alessandro

Description

We study how black hole superradiance appears in string microscopic models of rotating black holes. In order to disentangle superradiance from finite-temperature effects, we consider an extremal, rotating D1-D5-P black hole that has an ergosphere and is not supersymmetric. We explain how the microscopic dual accounts for the superradiant ergosphere of this black hole. The bound 0< omega < m Omega_H on superradiant mode frequencies is argued to be a consequence of Fermi-Dirac statistics for the spin-carrying degrees of freedom in the dual CFT. We also compute the superradiant emission rates from both sides of the correspondence, and show their agreement.
33 pages, 1 figure. v2: minor corrections