Radion clouds around evaporating black holes

TL;DR

This paper models the formation of radion clouds around evaporating black holes using a Kaluza-Klein framework, revealing how Hawking radiation influences extra-dimensional fields and creates observable effects like an energy-dependent albedo.

Contribution

It introduces a simple radion effective potential in a Kaluza-Klein model incorporating Hawking radiation, showing how black hole evaporation affects extra-dimensional fields.

Findings

Radion clouds form around evaporating black holes due to matter-induced vacuum shifts.

The radion cloud causes an energy-dependent reflection (albedo) of radiation.

The size of extra dimensions and black hole temperature influence the radion cloud properties.

Abstract

A Kaluza-Klein model, with a matter source associated with Hawking radiation from an evaporating black hole, is used to obtain a simple form for the radion effective potential. The environmental effect generally causes a matter-induced shift of the radion vacuum, resulting in the formation of a radion cloud around the hole. There is an albedo due to the radion cloud, with an energy dependent reflection coefficient that depends upon the size of the extra dimensions and the temperature of the hole.