  We investigate the phenomenology of a dark matter scenario containing two
generations of the dark matter particle, differing only by their mass and their
couplings to the other particles, akin to the quark and lepton sectors of the
Standard Model. For concreteness, we consider the case where the two dark
matter generations are Majorana fermions that couple to a right-handed lepton
and a scalar mediator through Yukawa couplings. We identify different
production regimes in the multi-flavor dark matter scenario and we argue that
in some parts of the parameter space the heavier generation can play a pivotal
role in generating the correct dark matter abundance. In these regions, the
strength of the dark matter coupling to the Standard Model can be much larger
than in the single-flavored dark matter scenario. Correspondingly the indirect
and direct detection signals can be significantly boosted. We also comment on
the signatures of the model from the decay of the heavier dark matter
generation into the lighter.
