RH Sneutrino Condensate CDM and the Baryon-to-Dark Matter Ratio

TL;DR

This paper proposes a model linking baryon and dark matter densities through right-handed sneutrino condensates and Affleck-Dine leptogenesis, predicting observable cosmological signatures and particle phenomenology.

Contribution

It introduces a novel MSSM-based framework connecting baryon asymmetry and dark matter via flat direction condensates and leptogenesis.

Findings

Consistent explanation for baryon-to-dark matter ratio.

Predicted observable isocurvature perturbations.

Distinctive long-lived NLSP phenomenology.

Abstract

The similarity of the observed mass densities of baryons and cold dark matter may be a sign they have a related origin. The baryon-to-dark matter ratio can be understood in the MSSM with right-handed (RH) neutrinos if CDM is due to a d = 4 flat direction condensate of very weakly coupled RH sneutrino LSPs and the baryon asymmetry is generated by Affleck-Dine leptogenesis along a d = 4 (H_{u}L)^2 flat direction. Observable signatures of the model include CDM and baryon isocurvature perturbations and distinctive long-lived NLSP phenomenology.