More quantum noise from wormholes

TL;DR

This paper explores how wormholes in dilaton gravity can model the pseudorandom noise necessary for unitary black hole evaporation, linking semiclassical gravity to quantum information aspects.

Contribution

It demonstrates that wormholes in dilaton gravity serve as classical solutions encoding the averaged effects of quantum noise in black hole radiation.

Findings

Wormholes depend on matter backreaction.

They relate to solutions producing the Page curve.

Modeling noise via wormholes supports unitarity in black hole evaporation.

Abstract

For black hole evaporation to be unitary, the naive density matrix of Hawking radiation needs to be corrected with a sprinkling of pseudorandom "noise." Using wormholes, semiclassical gravity appears to describe an averaged "true random" theory of this noise. We discuss the wormholes in dilaton gravity theories with matter. They are classical solutions that depend on a small amount of backreaction from matter fields, and they are closely related to the wormholes that give the Page curve.