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A stringy realization of a small and positive cosmological constant in dark bubble cosmology
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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.
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Cited by 3 Pith papers
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Weak gravity at micron scales from dark bubble cosmology and its cosmological consequences
Dark bubble cosmology predicts gravity weakens below L~10^-5 m, yielding V=-G4M(1/rho - 3L^2/(2rho^3)+...) and a radiation-only inflationary phase.
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Dark bubble cosmology and the equivalence principle
In dark bubble cosmology, non-abelian gauge fields like gluons would couple to induced gravity with the wrong sign, making the proton's gravitational mass about 1% of its inertial mass and ruling out the scenario agai...
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Towards a String Realization of the Dark Dimension via T-folds
A Scherk-Schwarz T-fold compactification is engineered so that, along a selected runaway trajectory, the scalar potential scales as V proportional to m_KK^4, as required by the Dark Dimension Scenario.
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