Remarks on Black Hole Evolution a la Firewalls and Fuzzballs

TL;DR

This paper discusses a theoretical scenario where black hole evolution is fully described by fundamental microscopic degrees of freedom, leading to a horizonless, unitary evolution similar to fuzzball models, and examines its consistency with recent findings.

Contribution

It proposes a scenario based on a fundamental theory of gravity that results in horizonless, unitary black hole evolution akin to fuzzball models, aligning with recent research.

Findings

Black hole evolution can be described without horizons in a fundamental theory.

The scenario supports unitary evolution and information preservation.

It is consistent with recent results by Almheiri et al.

Abstract

Assume that there exists a fundamental theory of gravity which has a fundamental length scale and which is capable of explaining black hole evolution process fully in terms of fundamental microscopic degrees of freedom. The resultant evolution will clearly be unitary and will have no information loss. Carrying this assumption to its logical conclusion and, in particular, by considering the size of the region obtained by resolving the black hole singularity in such a theory, we arrive at a scenario very similar to that in Mathur's fuzz ball proposal where there is no horizon. We also comment on the consistency of such a picture with the recent results of Almheiri et al.