Information loss, made worse by quantum gravity?

TL;DR

This paper shows that in a loop quantum gravity model, resolving the singularity problem can worsen the black hole information-loss issue by introducing new horizons and breakdowns in determinism.

Contribution

It provides an example where loop quantum gravity solves the singularity but exacerbates the information-loss problem, challenging previous assumptions.

Findings

Quantum effects do not eliminate the event horizon.

A new Cauchy horizon appears where determinism breaks down.

The black hole core acts like a naked singularity for practical purposes.

Abstract

Quantum gravity is often expected to solve both the singularity problem and the information-loss problem of black holes. This article presents an example from loop quantum gravity in which the singularity problem is solved in such a way that the information-loss problem is made worse. Quantum effects in this scenario, in contrast to previous non-singular models, do not eliminate the event horizon and introduce a new Cauchy horizon where determinism breaks down. Although infinities are avoided, for all practical purposes the core of the black hole plays the role of a naked singularity. Recent developments in loop quantum gravity indicate that this aggravated information loss problem is likely to be the generic outcome, putting strong conceptual pressure on the theory.