Inside an evaporating two-dimensional charged black hole

TL;DR

This paper explores the internal structure of an evaporating two-dimensional charged black hole, revealing that quantum effects cause the inner horizon to expand, which is a novel insight into black hole evaporation dynamics.

Contribution

It demonstrates that semiclassical effects lead to the expansion of the inner horizon in evaporating charged black holes, independent of quantum term magnitudes.

Findings

Inner horizon expands by a finite factor due to quantum effects

Expansion is independent of the magnitude of quantum terms

Evaporation involves both mass and charge loss

Abstract

We investigate the inner structure of an evaporating charged black hole, within the context of semiclassical dilaton gravity in two dimensions. The matter fields are charged, allowing the evaporation of both the mass and charge of the black hole. We find that the semiclassical effects cause the inner horizon to expand (by a finite factor), rather than to shrink to a point singularity. Although this expansion is a quantum phenomenon, the overall expansion factor is found to be independent of the magnitude of the quantum terms in the effective theory.