Two-component Dark Matter with co-genesis of Baryon Asymmetry of the
  Universe
  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 $\mu \rightarrow e
\gamma$.
