What can the information paradox tell us about the early Universe?

TL;DR

This paper explores how the resolution of the black hole information paradox via fuzzball states in string theory might provide insights into the early Universe's rapid expansion, suggesting a phase space spreading effect.

Contribution

It proposes a novel analogy between black hole fuzzball states and early Universe conditions, offering a qualitative perspective on cosmic expansion.

Findings

Fuzzball states can account for black hole entropy.

Phase space spreading may drive early Universe expansion.

Qualitative analysis suggests a new mechanism for cosmic growth.

Abstract

In recent years we have come to understand how the information paradox is resolved in string theory. The huge entropy $S_{bek}={A\over 4G}$ of black holes is realized by an explicit set of horizon sized `fuzzball' wavefunctions. The wavefunction of a collapsing shell spreads relatively quickly over this large phase space of states, invalidating the classical black hole geometry the shell would have created. We argue that a related effect may occur in the early Universe. When matter is crushed to high densities we can access a similarly large phase space of gravitational `fuzzball' solutions. While we cannot estimate specific quantities at this point, a qualitative analysis suggests that spreading over phase space creates an extra `push' expanding the Universe to larger volumes.