Primordial Lepton Oscillations and Baryogenesis
  The baryon asymmetry of the Universe should have been produced after the
inflation era. We consider the possibility that the asymmetry is generated by
the flavor oscillations in the reheating process after inflation, so that the
baryon asymmetry is realized already at the beginning of the radiation
dominated era. In the seesaw model, we show that the propagators of the
left-handed leptons generically have flavor mixings in the thermal background,
that can generate flavor-dependent lepton asymmetry through the $CP$ violation
in the oscillation phenomena. The flavor dependent rates for the wash-out
process can leave the net asymmetry today.
