Evaporation of charged black holes near extremality

TL;DR

This paper models the evaporation process of near-extremal charged black holes using an effective solvable model, revealing that decay to extremality takes an infinite amount of time.

Contribution

It introduces an analytical model for black hole evaporation near extremality, incorporating backreaction effects, which was not previously available.

Findings

Black holes require infinite time to reach extremality.

The effective model accurately describes the evaporation process.

Backreaction effects are crucial in the evaporation dynamics.

Abstract

The AdS_2\timesS^2 geometry of near-extremal Reissner-Nordstrom black holes can be described by an effective solvable model which allows to follow analytically the evaporation process including the backreaction. We find that an infinite amount of time is required for the black hole to decay to extremality.