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Dark dimension is in 5th dimension?

Cosmological constant

Manifold (fluid mechanics)

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The concept of a "dark dimension" with a characteristic length-scale in the micron range has been proposed as a solution to the cosmological hierarchy problem. This dark dimension is believed to exist in the fifth dimension . It has been suggested that the smallness of dark energy can be attributed to this internal dimension, and the universal coupling of Standard Model fields to the massive spin-2 Kaluza-Klein (KK) excitations of the graviton in this dark dimension leads to a dark matter candidate . The model also accommodates neutrino masses associated with right-handed neutrinos propagating in the bulk of the dark dimension . Additionally, the impact of the KK tower in cosmology has been studied, including the modulation of redshifted 21-cm lines driven by KK gravitons decaying into photons, which could be observed in next-generation experiments . Finally, the model parameters required for a successful uniform inflation driven by a 5-dimensional cosmological constant have been explored .

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Journal Article•DOI Aspects of the dark dimension in cosmology Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lust - Show less +2 more 16 Dec 2022 6 Citations	The paper does not explicitly mention whether the dark dimension is in the 5th dimension or not.
Open access•Posted Content•DOI Aspects of the Dark Dimension in Cosmology 16 Dec 2022	The paper does not explicitly mention whether the dark dimension is in the 5th dimension or not.
Open access•Journal Article•DOI Dark energy from the fifth dimension 03 Jan 2023 1 Citations	The paper does not explicitly mention a "dark dimension" in the fifth dimension. The paper discusses the dynamics of a four-dimensional manifold embedded in various five-dimensional backgrounds, including de Sitter space.
DOI Dark energy from the fifth dimension Allen Stern, Chun Xu - Show less +1 more 28 Jun 2022	The paper does not mention anything about a "dark dimension" in the fifth dimension. The paper discusses the dynamics of a four-dimensional manifold embedded in various five-dimensional backgrounds, but it does not specifically mention a "dark dimension."

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