Reflection, radiation and interference for black holes

TL;DR

This paper explores how black holes can reflect particles, linking the reflection process to Hawking radiation, and discusses how black hole properties influence this reflection based on wave mixing at the event horizon.

Contribution

It introduces the concept of black hole reflection and connects it to Hawking radiation, highlighting the physical origins of both phenomena as wave mixing at the event horizon.

Findings

Black holes can reflect particles with a probability depending on temperature and energy.

Reflection and Hawking radiation share a common physical origin in wave mixing.

The albedo of black holes varies with particle energy and black hole temperature.

Abstract

Black holes are capable of reflection: there is a finite probability for any particle that approaches the event horizon to bounce back. The albedo of the black hole depends on its temperature and the energy of the incoming particle. The reflection shares its physical origins with the Hawking process of radiation, both of them arise as consequences of the mixing of the incoming and outgoing waves that takes place on the event horizon.