Black Hole Final State Conspiracies

TL;DR

This paper explores the idea that certain black hole theories require 'conspiracies' between interior and late-time states to preserve unitarity, proposing that some AdS black holes' thermodynamics might support this concept.

Contribution

It introduces the possibility that unusual thermodynamics of some AdS black holes could enable the 'conspiracies' needed for unitarity in black hole evaporation.

Findings

Some AdS black holes exhibit unusual thermodynamics.

These thermodynamics may allow for the 'conspiracies' in black hole models.

The idea of summing over all AdS black holes with the same entropy is proposed.

Abstract

The principle that unitarity must be preserved in all processes, no matter how exotic, has led to deep insights into boundary conditions in cosmology and black hole theory. In the case of black hole evaporation, Horowitz and Maldacena were led to propose that unitarity preservation can be understood in terms of a restriction imposed on the wave function at the singularity. Gottesman and Preskill showed that this natural idea only works if one postulates the presence of "conspiracies" between systems just inside the event horizon and states at much later times, near the singularity. We argue that some AdS black holes have unusual internal thermodynamics, and that this may permit the required "conspiracies" if real black holes are described by some kind of sum over all AdS black holes having the same entropy.