Asymmetric self-interacting dark matter with a canonical seesaw model

TL;DR

This paper explores a model linking asymmetric dark matter and baryon asymmetry within a canonical seesaw framework, addressing small-scale structure issues and providing testable predictions across multiple experiments.

Contribution

It introduces a novel connection between asymmetric dark matter, baryon asymmetry, and seesaw neutrino models, with specific mass constraints and experimental verifiability.

Findings

Dark matter mass constrained to 1-460 GeV range.

Model achieves simultaneous dark matter relic abundance and baryon asymmetry.

Predictions are testable via direct, indirect detection, and collider experiments.

Abstract

We study the possibility of generating dark matter (DM) and baryon asymmetry of the Universe (BAU) simultaneously in an asymmetric DM framework, which also alleviates the small-scale structure issues of cold DM. While the thermal relic of such self-interacting DM remains under-abundant due to efficient annihilation into light mediators, a nonzero asymmetry in the dark sector can lead to the survival of the required DM in the Universe. The existence of a light mediator leads to the required self-interactions of DM at small scales while keeping DM properties similar to cold DM at large scales. It also ensures that the symmetric DM component annihilates away, leaving the asymmetric part in the spirit of cogenesis. The particle physics implementation is done in canonical seesaw models of light neutrino mass, connecting it to the origin of DM and BAU. In particular, we consider type-I and type-III seesaw origin of neutrino mass for simplicity and minimality of the field content. We show that the desired self-interactions and relic of DM together with BAU while satisfying relevant constraints lead to strict limits on DM mass $\mathcal{O}({\rm GeV}) \lesssim M_{\rm DM} \lesssim460 $ GeV. In spite of being a high-scale seesaw, the models remain verifiable in different experiments, including direct and indirect DM searches as well as colliders.