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arXiv · 2601.13315

Baryon-dark matter coincidence in Randall-Sundrum Model

Basabendu Barman·Ashmita Das·Partha Kumar Paul·Narendra Sahu·Rakesh Kumar SivaKumar
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Abstract

Within the framework of the extra-dimensional Randall-Sundrum set-up, we investigate the freeze-in production of Standard Model (SM) gauge-singlet scalar, fermionic, and massive vector dark matter (DM). Assuming that both the DM and SM fields reside on the IR brane and interact solely through the graviton and radion portal, we demonstrate that the Planck-observed DM relic abundance can be achieved across a wide range of reheating temperatures, all while naturally addressing the hierarchy problem, satisfying constraints from collider and early Universe cosmology. We further show that the same set-up can accommodate TeV-scale leptogenesis capable of generating the observed baryon asymmetry of the Universe. Interestingly, we find that current graviton searches at the Large Hadron Collider (LHC) already impose strong constraints on the reheating temperature in this scenario, providing a complementarity between cosmological and collider probes.

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Basabendu Barman, Ashmita Das, Partha Kumar Paul, Narendra Sahu, Rakesh Kumar SivaKumar. 2026-01-19. Baryon-dark matter coincidence in Randall-Sundrum Model. https://doi.org/10.1103/qjwc-snqq

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