Unifying Asymmetric Inert Fermion Doublet Dark Matter and Leptogenesis with Neutrino Mass

TL;DR

This paper presents a scalar triplet extension of the Standard Model that simultaneously explains neutrino masses, dark matter asymmetry, and baryon asymmetry through early Universe decay processes.

Contribution

It introduces a novel scalar triplet model that unifies neutrino mass generation, leptogenesis, and asymmetric dark matter production in a single framework.

Findings

Scalar triplet decay produces asymmetric dark matter and lepton asymmetry.

Lepton asymmetry converts to baryon asymmetry via sphalerons.

Neutrino masses arise from triplet vacuum expectation value.

Abstract

We propose a scalar Triplet extension of the standard model (SM) to unify the origin of neutrino mass with the visible and dark matter component of the Universe. We assume that the scalar triplet is super heavy, so that its CP-violating out-of-equilibrium decay in the early Universe not only produce asymmetric dark matter which is the neutral component of an additional vector like fermion doublet, but also give rise to lepton asymmetry. The latter gets converted to observed baryon asymmetry via B+L violating sphaleron processes. Below electroweak phase transition the scalar triplet acquires a vacuum expectation value and give rise to sub-eV Majorana masses to three flavors of active neutrinos. Thus an unification of the origin of neutrino mass, lepton asymmetry and asymmetric dark matter is achieved within a scalar triplet extension of the SM.