Microstates of Non-supersymmetric Black Holes

TL;DR

This paper demonstrates that the entropy of a non-supersymmetric extremal black hole in Type-I string theory matches the microstates of a corresponding D-brane configuration, suggesting a deeper understanding of black hole microstates beyond supersymmetry.

Contribution

It shows that the Bekenstein-Hawking entropy of a non-supersymmetric extremal black hole matches D-brane microstates, despite the lack of supersymmetric nonrenormalization theorems.

Findings

Black hole entropy counts D-brane microstates.

Classical nonrenormalization may explain entropy-microstate matching.

Results extend understanding of black hole microstates beyond supersymmetry.

Abstract

A five-dimensional dyonic black hole in Type-I theory is considered that is extremal but non-supersymmetric. It is shown that the Bekenstein-Hawking entropy of this black hole counts precisely the microstates of a D-brane configuration with the same charges and mass, even though there is no apparent supersymmetric nonrenormalization theorem for the mass. A similar result is known for the entropy at the stretched horizon of electrically charged, extremal, but non-supersymmetric black holes in heterotic string theory. It is argued that classical nonrenormalization of the mass may partially explain this result.