A stringy realization of a small and positive cosmological constant in dark bubble cosmology

Abstract

In this paper we construct a stringy embedding of the dark bubble model of an expanding 4D cosmology with the help of branes rotating in extra dimensions. The universe rides a bubble which has nucleated in an unstable higher dimensional background. Our construction is therefore a string theoretical realization of Vilenkin's quantum cosmology. While the cosmological constant vanishes at lowest order, loop corrections predicted by the Weak Gravity Conjecture can induce a phenomenologically viable value. The model predicts the existence of large extra dimensions compatible with observational constraints, and we note a possible connection with the dark dimension proposal.

20 pages, 4 figures

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• Charged Nariai black holes on the dark bubble
• Non-supersymmetric heterotic strings on $Ad{S}_4\times S^3\times S^3$
• Weak gravity at micron scales from dark bubble cosmology and its cosmological consequences
• Towards a String Realization of the Dark Dimension via T-folds