The doomsday of black hole evaporation

TL;DR

This paper explores how black hole evaporation might slow down near the end due to fundamental principles, suggesting a longer lifetime for small black holes before quantum gravity effects dominate.

Contribution

It proposes a new scenario where black hole evaporation rate transitions from inverse square law to a constant rate near the end, based on unitarity, entropy bounds, and cosmic censorship.

Findings

Evaporation rate becomes constant near the end of evaporation.

Black hole lifetime is slightly extended for lighter black holes.

Supports the idea of a modified evaporation process before quantum gravity effects.

Abstract

By assuming simultaneously the unitarity of the Hawking evaporation and the universality of Bekenstein entropy bound as well as the validity of cosmic censorship conjecture, we find that the black hole evaporation rate could evolve from the usual inverse square law in black hole mass into a constant evaporation rate near the end of the Hawking evaporation before quantum gravity could come into play, inferring a slightly longer lifetime for lighter black holes.