Growth of a Black Hole on a Self-Gravitating Radiation

TL;DR

This paper investigates how a black hole grows when fed with self-gravitating radiation, revealing that the growth occurs suddenly and entropy absorption is concentrated at the collapse's end.

Contribution

It demonstrates the impact of self-gravity on black hole growth dynamics and entropy absorption during collapse, highlighting a sudden horizon expansion.

Findings

Black hole growth is a sudden jump rather than gradual.

Self-gravity distinguishes thermodynamic interactions at different shell boundaries.

Most entropy is absorbed into the black hole at the last moment of collapse.

Abstract

We feed a black hole on a self-gravitating radiation and observe what happens during the process. Considering a spherical shell of radiation, we show that the contribution of self-gravity makes the thermodynamic interaction through the bottom of the shell be distinguished from thermodynamic interaction through its top. The growth of a black hole horizon appears to be a sudden jump rather than a sequential increase. We additionally show that much of the entropy will be absorbed into the black hole only at the last moment of the collapse.