D1D5 microstate geometries from string amplitudes

TL;DR

This paper establishes a direct link between supergravity and D-brane descriptions of D1D5 microstates by computing string emission amplitudes, revealing how microscopic profiles relate to open string condensates.

Contribution

It demonstrates how to reproduce D1D5 microstate geometries from string amplitude calculations, connecting microscopic string theory data with supergravity solutions.

Findings

Reproduced asymptotic expansion of D1D5 microstates from string amplitudes.

Linked supergravity profiles to open string condensates.

Provided a method to analyze microstates at non-zero string coupling.

Abstract

We reproduce the asymptotic expansion of the D1D5 microstate geometries by computing the emission amplitudes of closed string states from disks with mixed D1D5 boundary conditions. Thus we provide a direct link between the supergravity and D-brane descriptions of the D1D5 microstates at non-zero string coupling. Microscopically, the profile functions characterizing the microstate solutions are encoded in the choice of a condensate for the twisted open string states connecting D1 and D5 branes.