Semiclassical Decay of Near-Extremal Black Holes

TL;DR

This paper investigates the decay process of near-extremal black holes using semiclassical methods, revealing potential horizon instabilities and discussing implications for black hole and D-brane models.

Contribution

It introduces a semiclassical analysis of black hole decay, highlighting horizon instability and clarifying the role of injected matter and Hawking pairs.

Findings

Singularity at the origin is irrelevant to decay dynamics.

Potential instability of the event horizon due to matter accumulation.

Implications for reconciling D-brane and black hole decay pictures.

Abstract

Decay of a near-extremal black hole down to the extremal state is studied in the background field approximation to determine the fate of injected matter and Hawking pairs. By examining the behavior of light rays and solutions to the wave equation it is concluded that the singularity at the origin is irrelevant. Furthermore, there is most likely an instability of the event horizon arising from the accumulation of injected matter and Hawking partners there. The possible role of this instability in reconciling the D-brane and black hole pictures of the decay process is discussed.