Black hole microstate geometries from string amplitudes

TL;DR

This paper reviews calculations of supergravity fields from D1-D5-brane bound states with traveling waves, revealing multipole moments that differ from classical black hole solutions and aiding in constructing new supergravity ansatzes.

Contribution

It introduces a new 1/8-BPS supergravity ansatz derived from string amplitude calculations of D-brane bound states.

Findings

Fields differ from black hole solutions by multipole moments

Effective open string coupling is small at large distances

Supports construction of new supergravity solutions

Abstract

In this talk we review recent calculations of the asymptotic supergravity fields sourced by bound states of D1 and D5-branes carrying travelling waves. We compute disk one-point functions for the massless closed string fields. At large distances from the branes, the effective open string coupling is small, even in the regime of parameters where the classical D1-D5-P black hole may be considered. The fields sourced by the branes differ from the black hole solution by various multipole moments, and have led to the construction of a new 1/8-BPS ansatz in type IIB supergravity.