White holes and eternal black holes

TL;DR

This paper explores the theoretical properties of white holes, showing they emit Hawking radiation and can influence black hole stability through time-reversal effects, suggesting conditions for eternal black holes.

Contribution

It introduces the concept that white holes can produce Hawking radiation and affect black hole longevity via time-reversal phenomena, a novel theoretical insight.

Findings

White holes emit quasi-thermal Hawking radiation.

Time-reversal of radiation can stabilize black holes.

White holes are modeled as vacuum solutions in general relativity.

Abstract

We investigate isolated white holes surrounded by vacuum, which correspond to the time reversal of eternal black holes that do not evaporate. We show that isolated white holes produce quasi- thermal Hawking radiation. The time reversal of this radiation, incident on a black hole precursor, constitutes a special preparation that will cause the black hole to become eternal.