Leptogenesis and CPT Violation
  We construct a model in which neutrinos and anti-neutrinos acquire the same
mass but slightly different energy dispersion relations.Despite CPT violation,
spin-statistics is preserved. We find that leptogenesis can be easily explained
within this model, without upsetting the solar, atmospheric and reactor
neutrino data. Leptogenesis occurs without lepton number violation and the
non-equilibrium condition. We consider only three active Dirac neutrinos, and
no new particles or symmetries are introduced.
