De Sitter bubbles from anti-de Sitter 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 point out that, given a global anti-de Sitter background, the formation of such 'de Sitter bubbles' will be enhanced by mechanisms analogous to the Bizoń-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.

Regular evaporating black holes with stable cores

“…In this way, regular black holes may also 1 Also see [19] for a review and further references. 2 For recent work on the dynamical creation of horizons from the collapse to a regular black hole see [21]. 3 In the rotating case, the question about the final state is more complicated since the Hawking flux may first spin down the black hole and only subsequently carry away its mass [23].…”