The Gravitational Description of Coarse Grained Microstates

TL;DR

This paper constructs a detailed correspondence between microstates of the D1-D5 system and supergravity solutions, illustrating how gravity emerges from coarse graining microstates and confirming microscopic descriptions of certain black hole geometries.

Contribution

It provides a detailed map linking microstates to supergravity solutions, enhancing understanding of gravity emergence and black hole microstate geometries.

Findings

Confirmed microscopic descriptions of conical defect metrics

Validated the M=0 BTZ black hole and small black rings

Observed entropy of the stretched horizon exceeds that of the microstates

Abstract

In this paper we construct a detailed map from pure and mixed half-BPS states of the D1-D5 system to half-BPS solutions of type IIB supergravity. Using this map, we can see how gravity arises through coarse graining microstates, and we can explicitly confirm the microscopic description of conical defect metrics, the M=0 BTZ black hole and of small black rings. We find that the entropy associated to the natural geometric stretched horizon typically exceeds that of the mixed state from which the geometry was obtained.