Near-Extremal Black Hole Evaporation in Asymptotically Flat Spacetime

TL;DR

This paper investigates the semi-classical evaporation process of near-extremal black holes in asymptotically flat spacetime, demonstrating smooth evaporation without horizon instabilities.

Contribution

It provides a detailed analysis of black hole evaporation including back-reaction effects in a spherically reduced model with Minkowski asymptotics, highlighting stability during evaporation.

Findings

Evaporation proceeds smoothly without instabilities.

Back-reaction effects are incorporated semi-classically.

No horizon instabilities occur before the endpoint.

Abstract

We study black hole evaporation of near-extremal black holes in spherically reduced models with asymptotically Minkowskian spacetime, with the effects of the back-reaction on the geometry included semi-classically. The stress-energy tensor is calculated for null in-falling observers. It is shown that the evaporation proceeds smoothly and there are no instabilities of the outer or inner apparent horizon before the endpoint of evaporation.