# Two-component Dark Matter with co-genesis of Baryon Asymmetry of the Universe

## TL;DR

This paper proposes a minimal model with two distinct dark matter components, one thermal and one non-thermal, which also explains neutrino masses and baryon asymmetry, with testable predictions at current experiments.

## Contribution

It introduces a unified framework for two-component dark matter, neutrino mass generation, and baryon asymmetry within a minimal extension of the standard model.

## Key findings

- Thermal DM mass can be as low as 3 TeV.
- Non-thermal DM can be as low as a few keV, potentially acting as warm dark matter.
- Model is compatible with experimental bounds and testable at current experiments.

## Abstract

We discuss the possibility of realising a two-component dark matter (DM) scenario where the two DM candidates differ from each other by virtue of their production mechanism in the early universe. One of the DM candidates is thermally generated in a way similar to the weakly interacting massive particle (WIMP) paradigm where the DM abundance is governed by its freeze-out while the other candidate is produced only from non-thermal contributions similar to freeze-in mechanism. We discuss this in a minimal extension of the standard model where light neutrino masses arise radiatively in a way similar to the scotogenic models with DM particles going inside the loop. The lepton asymmetry is generated at the same time from WIMP DM annihilations as well as partially from the mother particle for non-thermal DM. This can be achieved while satisfying the relevant experimental bounds, and keeping the scale of leptogenesis or the thermal DM mass as low as 3 TeV, well within present experimental reach. In contrast to the TeV scale thermal DM mass, the non-thermal DM can be as low as a few keV, giving rise to the possibility of a sub-dominant warm dark matter (WDM) component that can have interesting consequences on structure formation. The model also has tantalizing prospects of being detected at ongoing direct detection experiments as well as the ones looking for charged lepton flavour violating process like $\mu \rightarrow e \gamma$.