Black Holes as Rubik's Cubes

TL;DR

This paper introduces a simplified quantum model of black hole evaporation where entanglement diminishes over time, offering insights into how information might escape from black holes.

Contribution

It presents a novel toy model that captures key features of black hole evaporation, including information release and a vacuum state representing complete evaporation.

Findings

Entanglement between interior and exterior diminishes at late times.

The model exhibits the information-free property.

A vacuum state exists for the fully evaporated black hole.

Abstract

We propose a unitary toy model of black hole evaporation, in which the entanglement between the interior and exterior degrees of freedom vanishes at late times. Our model possesses the information-free property and satisfies the niceness conditions discussed in the literature. A key feature of the model is that the Hilbert space of black hole internal states contains a vacuum state corresponding to the completely evaporated black hole, which can be reached from any initial state via the Hawking process. Our model suggests a novel quantum cosmological way in which information can get out of an evaporating black hole.