Hawking radiation from the double copy

TL;DR

This paper demonstrates how Hawking radiation and its thermal spectrum can be derived from the double copy relation between gravity and gauge theories, extending the understanding beyond perturbative regimes.

Contribution

It introduces a novel approach combining worldline and amplitudes methods to connect Hawking radiation with gauge theory particle production via the double copy.

Findings

Hawking radiation emerges from gauge theory particle production without a horizon

The approach unifies classical and quantum double copy prescriptions for black holes

Thermal spectrum and horizon dependence are derived from gauge theory analogs

Abstract

Gravity and gauge theory are concretely linked by the double copy. Although well-studied at the level of perturbative scattering in vacuum, far less is known about non-perturbative aspects or extensions of the double copy beyond trivial backgrounds. We show here how Hawking radiation in a collapse metric, its associated thermal spectrum, and horizon-dependence, emerges from the double copy of particle production in a background gauge field, where there is no global horizon, nor a thermal spectrum. Our approach combines worldline and amplitudes methods, and allows the unification of several classical and quantum double copy prescriptions for black hole spacetimes.