The Dark Dimension in a Warped Throat

Abstract

By combining swampland conjectures with observational data, it was suggested that our universe should lie in an asymptotic region of the quantum gravity landscape. The generalized distance conjecture for dS, the smallness of the cosmological constant and astrophysical constraints led to a scenario with one mesoscopic large dimension of size $\ell \sim {\Lambda }^{-1/4}\sim 10^{-6}$m. We point out that a strongly warped throat with its redshifted KK tower provides a natural string theoretic mechanism that realizes the scaling $m\sim {\Lambda }^{\alpha }$ with the factor $\alpha =1/4$, the dark dimension being the one along the throat. We point out that in string theory it could be challenging to keep other KK towers heavy enough to avoid a conflict with astrophysical constraints on the number of extra large dimensions.

12 pages; v2: minor revisions and refs added, version accepted by Phys. Lett. B

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• (In)stability of de Sitter vacuum in light of distance conjecture and emergence proposal
• On the correspondence between black holes, domain walls and fluxes
• Uplift and towers of states in warped throat
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Confinement from Distance in Metric Space and its Relation to Cosmological Constant
• Bounds on tower mass scales in the presence of throats of different warping
• The dark dimension, proton decay, and the length of the M-theory interval
• Breaking Free from the Swampland of Impossible Universes through the DESI Portal
• The Cosmological Constant, Dark Matter and the ElectroWeak Scale meet in the Swampland
• Towards a String Realization of the Dark Dimension via T-folds