Information storage and near horizon quantum correlations

TL;DR

This paper argues that the traditional size of the information storage region around a black hole must be expanded when the black hole's radiation becomes maximally correlated, reflecting quantum unitarization effects.

Contribution

It introduces the idea that the entropy sphere around a quantum black hole enlarges due to quantum correlations, challenging classical notions and aligning with holographic unitarization insights.

Findings

The entropy sphere size increases with maximal radiation entropy.

Quantum correlations extend beyond the classical horizon.

Holography supports the enlargement due to unitarization.

Abstract

It is usually stated that the information storing region associated with the Bekenstein-Hawking entropy is enclosed by a sphere of diameter equal twice the Schwarzschild radius. We point out that this cannot apply to a quantum black hole. The deviation is particularly revealed when the latter is maximally correlated with its Hawking radiation. Specifically, we demonstrate that the size of the entropy sphere associated with the underlying microstructure has to be necessarily broadened when the fine grained radiation entropy becomes maximal. Such an enlargement is understood to be the consequence of unitarization effects in quantum gravity and aligns with recent findings in holography arguing that purification happens via semiclassically invisible quantum correlations extending across the black hole atmosphere. In the present work, we consider an evaporating black hole in asymptotically flat spacetime. We assume that the standard thermodynamical description is valid so long the black hole viewed from the outside is sufficiently large, radiation escaping into the future null infinity can be described on a smooth spacetime background, and the von Neumann entropy of Hawking radiation evolves unitarily. We briefly comment on the black hole singularity.