Non-extremal fuzzballs and ergoregion emission

TL;DR

This paper extends the understanding of ergoregion emission in non-extremal fuzzball microstates, showing agreement between gravity and CFT descriptions and providing formulas for emission based on wavefunction behavior.

Contribution

It generalizes previous results to a broader class of microstates, detailing ergoregion structures and emission mechanisms in fuzzball geometries.

Findings

Emission occurs via ergoregions, not horizons, in extended microstates.

Exact agreement between gravity and CFT emission calculations.

Derived expressions for emission based on wavefunction falloff.

Abstract

In the traditional picture of black holes Hawking radiation is created by pair creation from the vacuum at the horizon. In the fuzzball proposal, individual microstates do not have a horizon with the `vacuum' state in its vicinity. For a special family of non-extremal microstates it was recently found that emission occurs due to pair creation in an ergoregion, rather than at a horizon. In this paper we extend this result to a slightly larger class of microstates, again finding exact agreement between the emission in the gravity picture and the CFT dual. We write down an expression for emission from geometries with ergoregions, in terms of the leading falloff behavior of the wavefunctions in the fuzzball region. Finally, we describe another family of nonextremal microstates and find their ergoregion.