dS universe emergent from Kerr-AdS spacetime: bubble nucleation catalyzed by a black hole
arXiv:2209.05625 · doi:10.1007/JHEP05(2023)107
Abstract
The emergence of a four-dimensional de Sitter (dS) universe on an expanding bubble in the five-dimensional anti-de Sitter (AdS) background has been suggested as a possible cosmological scenario. It is motivated by the difficulties in the realization of a stable de Sitter vacua in string theory. The bubble can be nucleated in a meta-stable pure AdS spacetime, but it is known that a pure AdS spacetime is non-perturbatively unstable. It means that the pure AdS background is an idealized situation, and in realistic situations, non-linear perturbations in AdS may lead to the formation of black holes due to the gravitational turbulent instability. To investigate how the proposed scenario works in a more realistic situation, we here study the nucleation process of a vacuum bubble in the Kerr-AdS spacetime. Especially we investigate conditions sufficient to ensure the nucleation of a vacuum bubble with a rotating black hole and how the black hole affects the transition rate. We find that even in the Kerr-AdS spacetime, a quasi-dS expansion can be realized on the nucleated vacuum bubble without contradicting the de Sitter swampland conjectures.
arXiv comment18 pages, 8 figures
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