Exploring the freeze-in mechanism for scotogenic singlet dark matter

TL;DR

This paper investigates the freeze-in production of singlet scalar or fermion dark matter within a scotogenic model, showing many parameter regions align with observed relic density and lepton flavor violation constraints.

Contribution

It provides the first comprehensive scan of freeze-in dark matter in a scotogenic model, highlighting viable parameter spaces consistent with cosmological and experimental constraints.

Findings

Large parameter regions match Planck relic density limits.

Most parameter regions respect lepton flavor violation constraints.

Freeze-in mechanism is promising within scotogenic frameworks.

Abstract

We present an exploratory study of the freeze-in mechanism within a scotogenic framework, where dark matter can either be a scalar singlet or a fermion singlet. Based on a random parameter scan, we show that large portions of the parameter space feature a dark matter relic density in agreement with the limits derived by Planck. Moreover, constraints related to lepton flavour violation are mostly respected within such parameter regions. Our study shows that it will be worth to further investigate the freeze-in mechanism within scotogenic frameworks.