TeV Scale Neutrino Mass Generation, Minimal Inelastic Dark Matter, and
  High Scale Leptogenesis
  The seesaw and leptogenesis commonly depend on the masses of same particles,
and thus are both realized at the same scale. In this work, we demonstrate a
new possibility to realize a TeV-scale neutrino seesaw and a natural high-scale
leptogenesis. We extend the standard model by two gauge-singlet scalars, a
vector-like iso-doublet fermion and one iso-triplet Higgs scalar. Our model
respects a softly broken lepton number and an exactly conserved $Z_2$ discrete
symmetry. It can achieve three things altogether: (i) realizing a testable
type-II seesaw at TeV scale with two nonzero neutrino mass-eigenvalues, (ii)
providing a minimal inelastic dark matter from the new fermion doublets, and
(iii) accommodating a thermal or nonthermal leptogenesis through the singlet
scalar decays. We further analyze the current experimental constraints on our
model and discuss the implications for the dark matter direct detections and
the LHC searches.
