Inflationary Gravitational Leptogenesis
  We consider the generation of the baryon asymmetry in models with
right-handed neutrinos produced through gravitational scattering of the
inflaton during reheating. The right-handed neutrinos later decay and generate
a lepton asymmetry, which is partially converted to a baryon asymmetry by
Standard Model sphaleron processes. We find that a sufficient asymmetry can be
generated for a wide range of right-handed neutrino masses and reheating
temperatures. We also show that the same type of gravitational scattering
produces Standard Model Higgs bosons, which can achieve inflationary reheating
consistent with the production of a baryon asymmetry.
