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Baryon-dark matter coincidence in Randall-Sundrum model

Basabendu Barman1,*, Ashmita Das1,†, Partha Kumar Paul2,‡, Narendra Sahu2,§, and Rakesh Kumar SivaKumar1,∥

  • *Contact author: basabendu.b@srmap.edu.in
  • †Contact author: ashmita.d@srmap.edu.in
  • ‡Contact author: ph22resch11012@iith.ac.in
  • §Contact author: nsahu@phy.iith.ac.in
  • ∥Contact author: rakesh_sivakumar@srmap.edu.in
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Phys. Rev. D 113, 115029 – Published 11 June, 2026

DOI: https://doi.org/10.1103/qjwc-snqq

Abstract

Within the framework of the extra-dimensional Randall-Sundrum setup, 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 setup 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 already impose strong constraints on the reheating temperature in this scenario, providing a complementarity between cosmological and collider probes.

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Phys. Rev. D 113, 115029– Published 11 June, 2026
  • Received 6 April 2026
  • Accepted 22 May 2026
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