De Sitter bubbles from anti-de Sitter fluctuations

TL;DR

This paper explores how localized de Sitter-like regions, or 'bubbles', can form within anti-de Sitter space due to fluctuations, potentially leading to multiple accelerating universes, supported by numerical simulations in a simplified gravity model.

Contribution

It demonstrates the formation of de Sitter bubbles in anti-de Sitter space through numerical analysis, extending the understanding of universe creation scenarios in fundamental physics.

Findings

Enhanced formation of de Sitter bubbles in AdS due to instability mechanisms.

Numerical evidence of bubble collapse in a 2D dilaton-gravity model.

Potential for multiple accelerating universes from AdS fluctuations.

Abstract

Cosmological acceleration is difficult to accommodate in theories of fundamental interactions involving supergravity and superstrings. An alternative is that the acceleration is not universal but happens in a large localized region, which is possible in theories admitting regular black holes with de Sitter-like interiors. We considerably strengthen this scenario by placing it in a global anti-de Sitter background, where the formation of 'de Sitter bubbles' will be enhanced by mechanisms analogous to the Bizon-Rostworowski instability in general relativity. This opens an arena for discussing the production of multiple accelerating universes from anti-de Sitter fluctuations. We demonstrate such collapse enhancement by explicit numerical work in the context of a simple two-dimensional dilaton-gravity model that mimics the spherically symmetric sector of higher-dimensional gravities.