Cogenesis of visible and dark sector asymmetry in a minimal seesaw framework

TL;DR

This paper presents a minimal extension of the Standard Model with three sterile neutrinos that simultaneously explains neutrino masses, dark matter abundance, and the matter-antimatter asymmetry in both visible and dark sectors through a common asymmetric origin.

Contribution

It demonstrates that without additional symmetries, a minimal { u}MSM extension can generate asymmetric dark matter and matter-antimatter asymmetries in both sectors.

Findings

Dark matter masses range from 1 to 100 keV.

The model reproduces observed neutrino masses via Type-I seesaw.

Dark sector asymmetry is linked to heavy neutrino parity dominance.

Abstract

Recently there is a renewed interest in exploring the Dark sector of the universe in a more constrained way. Particularly in [1], the FIMP ( Feebly Interacting Massive Particle) scenario was shown to be realized with a minimal extension of the SM with three sterile neutrinos in the spirit of {\nu}MSM. In this paper, we show that without invoking any additional symmetries of the model, we can realize the idea of ADM (Asymmetric Dark Matter) signaling a common origin of the matter-anti-matter asymmetries in visible as well as Dark sectors. The model allows for a range of dark matter masses, 1 - 100keV, with correct active neutrino masses through the Type-I seesaw mechanism. Thus, the model explains the neutrino masses, Dark Matter abundance and replicates matter-anti-matter asymmetry of the visible sector in the Dark sector, all in a version of the {\nu}MSM. The asymmetry in the dark sector is manifested in the predominance of one parity of the heavy neutrinos in the comoving frame, which should be determinable in the ongoing experiments.