Universe Explosions

TL;DR

This paper proposes a quantum scenario for the universe's transition from a big crunch to a big bang, drawing parallels with black hole evaporation and emphasizing the role of entropy bounds and external observers.

Contribution

It introduces a novel quantum explosion model for the big crunch to big bang transition, inspired by black hole physics and entropy considerations.

Findings

The transition occurs when entropy bounds are saturated.

The scenario is illustrated with three cosmological models.

Potential late-time observables may reveal pre-transition information.

Abstract

A scenario for a quantum big crunch to big bang transition is proposed. We first clarify the similarities between this transition and the final stages of black hole evaporation. The black hole and the universe are thought of as quantum states. The importance of an external observer for understanding the big crunch to big bang transition is emphasized. Then, relying on the similarities between the black hole and the universe, we propose that the transition should be described as an explosion that connects the contracting phase to the expanding one. The explosion occurs when entropy bounds are saturated, or equivalently when the states cease to be semiclassically (meta)stable. We discuss our scenario in three examples: collapsing dust, a brane universe falling into a bulk black hole in anti-de Sitter space, and a contracting universe filled with a negative cosmological constant and a small amount of matter. We briefly discuss the late time observables that may carry some information about the state of the universe before the transition.