Microscopic Theory of Black Hole Superradiance

TL;DR

This paper explores how black hole superradiance can be understood through string theory models, specifically analyzing an extremal rotating D1-D5-P black hole and confirming the microscopic explanation of superradiant behavior.

Contribution

It provides a microscopic string theory account of black hole superradiance, linking superradiant bounds to Fermi-Dirac statistics in the dual conformal field theory.

Findings

Superradiant mode frequency bound explained by Fermi-Dirac statistics.

Microscopic and macroscopic emission rates agree.

Analysis focused on extremal, rotating, non-supersymmetric D1-D5-P black hole.

Abstract

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.