Black hole evaporation in conformal gravity

TL;DR

This paper investigates the formation and evaporation of non-rotating black holes in conformal gravity, revealing singularity-free solutions with Hawking temperature similar to Schwarzschild black holes, and analyzes their evaporation in different statistical ensembles.

Contribution

It introduces a new class of singularity-free black holes in conformal gravity and studies their thermodynamics and evaporation process in both canonical and micro-canonical ensembles.

Findings

Black holes in conformal gravity are singularity-free.

They have Hawking temperature matching Schwarzschild black holes.

Complete evaporation can occur in finite or infinite time depending on the ensemble.

Abstract

We study the formation and the evaporation of a spherically symmetric black hole in conformal gravity. From the collapse of a spherically symmetric thin shell of radiation, we find a singularity-free non-rotating black hole. This black hole has the same Hawking temperature as a Schwarzschild black hole with the same mass, and it completely evaporates either in a finite or in an infinite time, depending on the ensemble. We consider the analysis both in the canonical and in the micro-canonical statistical ensembles. Last, we discuss the corresponding Penrose diagram of this physical process.