Freeze-in Leptogenesis via Dark-Matter Oscillations
  We study the cosmology and phenomenology of freeze-in baryogenesis via
dark-matter oscillations, taking the dark matter to couple to Standard Model
leptons. We investigate viable models both with and without a $Z_2$ symmetry
under which all new fields are charged. Lepton flavor effects are important for
leptogenesis in these models, and we identify scenarios in which the baryon
asymmetry is parametrically distinct from and enhanced relative to leptogenesis
from sterile neutrino oscillations. The models we study predict the existence
of new, electroweak-charged fields, and can be tested by a combination of
collider searches, structure-formation studies, X-ray observations, and
terrestrial low-energy tests.
