Baryon-dark matter coincidence in Randall-Sundrum Model

TL;DR

This paper explores how the Randall-Sundrum model can naturally produce the observed dark matter abundance and baryon asymmetry through graviton-mediated interactions, with implications for collider searches and cosmology.

Contribution

It demonstrates that the Randall-Sundrum framework can simultaneously explain dark matter relic abundance and baryogenesis while satisfying collider and cosmological constraints.

Findings

Reproduces observed dark matter relic abundance across various reheating temperatures.

Shows compatibility with TeV-scale leptogenesis for baryon asymmetry.

Current LHC graviton searches constrain reheating temperature in this model.

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, we demonstrate that the observed DM relic abundance measured by Planck can be achieved across a wide range of reheating temperatures, all while naturally addressing the hierarchy problem, satisfying constraints from collider, early Universe cosmology including $\Delta{N}_{\rm eff}$. We further show that the same set-up can accommodate TeV-scale leptogenesis capable of generating the observed baryon asymmetry of the Universe. Remarkably, we find that current graviton searches at the Large Hadron Collider (LHC) already impose strong constraints on the reheating temperature in this scenario.