Gravitational waves from neutrino mass and dark matter genesis
  We introduce a model in which the genesis of dark matter (DM) and neutrino
masses is associated with a first order phase transition of a scalar singlet
field. During the phase transition a source right-handed neutrino (RHN)
acquires a spacetime-dependent mass dynamically, a small fraction of which is
converted via resonant oscillations into a very weakly mixed dark RHN which
decays to a dark matter RHN with the observed relic abundance. Neutrino masses
are generated via a traditional two RHN type-I seesaw between a fourth RHN and
the source neutrino. The gravitational waves produced during the phase
transition have a peak frequency that increases with the DM mass, and are
detectable at future gravitational wave interferometers for DM masses above ~ 1
MeV. Since the source RHNs are heavier than the electroweak scale, successful
leptogenesis is also attainable.
