Post-radiation evolution of black holes

TL;DR

This paper investigates the evolution of black holes after radiation, using semiclassical equations to show that collapse results in a stable black hole with a nearly closed apparent horizon and an unavoidable Cauchy horizon.

Contribution

It provides a detailed analysis of black hole collapse dynamics, revealing the formation of a stable black hole with unique horizon features within semiclassical theory.

Findings

Black hole collapse ends with a stable black hole of slightly supermassive mass.

The apparent horizon is nearly closed in the final state.

An irremovable Cauchy horizon is present in the solution.

Abstract

The expectation-value equations for the collapse of a macroscopic, spherically symmetric, and uncharged body are integrated up to the limit of validity of semiclassical theory. The collapse finishes with a true stable black hole of the mass microscopically exceeding the vacuum-induced charge. The apparent horizon is almost closed. The most important feature of the solution is the presence of an irremovable Cauchy horizon.