Inert Scalar Doublet Asymmetry as Origin of Dark Matter

TL;DR

This paper explores how a primordial B-L asymmetry in the inert scalar doublet model can lead to the current dark matter abundance, linking early universe asymmetries to present-day dark matter.

Contribution

It demonstrates that a B-L asymmetry can be reprocessed into an inert scalar asymmetry, providing a novel origin for dark matter within the inert doublet framework.

Findings

Inert scalar mass scale is in the few-TeV range.

Dark matter particles decay into lighter particles consistent with Z2 symmetry.

B-L asymmetry can be converted into dark matter asymmetry.

Abstract

In the inert scalar doublet framework, we analyze what would be the effect of a $B-L$ asymmetry that could have been produced in the Universe thermal bath at high temperature. We show that, unless the "$\lambda_5$" scalar interaction is tiny, this asymmetry is automatically reprocessed in part into an inert scalar asymmetry that could be at the origin of dark matter today. Along this scenario, the inert mass scale lies in the few-TeV range and direct detection constraints require that the inert scalar particles decay into a lighter dark matter particle which, as the inert doublet, is odd under a $Z_2$ symmetry.