Lorentz violation and Hawking radiation

TL;DR

This paper examines how Lorentz violation at high energies affects Hawking radiation, revealing that subluminal dispersion makes it insensitive, while superluminal dispersion involves unknown quantum gravity effects.

Contribution

It clarifies the impact of Lorentz violation on Hawking radiation, highlighting differences between subluminal and superluminal dispersion.

Findings

Hawking radiation is insensitive to Lorentz violation with subluminal dispersion.

Superluminal dispersion involves modes originating from the singularity.

The behavior depends critically on the type of dispersion relation.

Abstract

Since the event horizon of a black hole is a surface of infinite redshift, it might be thought that Hawking radiation would be highly sensitive to Lorentz violation at high energies. In fact, the opposite is true for subluminal dispersion. For superluminal dispersion, however, the outgoing black hole modes emanate from the singularity in a state determined by unknown quantum gravity processes.