Asymptotically-flat supergravity solutions deep inside the black-hole regime

TL;DR

This paper constructs a family of smooth, horizonless supergravity solutions that mimic black holes with the same charges and angular momenta, providing insights into black hole microstates and holography.

Contribution

It introduces an infinite family of horizonless supergravity solutions with the same charges as supersymmetric D1-D5-P black holes, extending the understanding of black hole microstates.

Findings

Solutions have the same charges and angular momenta as black holes.

They feature asymptotically flat regions and AdS throats ending in smooth caps.

The solutions can have arbitrarily small angular momenta.

Abstract

We construct an infinite family of smooth asymptotically-flat supergravity solutions that have the same charges and angular momenta as general supersymmetric D1-D5-P black holes, but have no horizon. These solutions resemble the corresponding black hole to arbitrary accuracy outside of the horizon: they have asymptotically flat regions, AdS_3 x S^3 throats and very-near-horizon AdS_2 throats, which however end in a smooth cap rather than an event horizon. The angular momenta of the solutions are general, and in particular can take arbitrarily small values. Upon taking the AdS_3 x S^3 decoupling limit, we identify the holographically-dual CFT states.