Gravitational Baryogenesis after Anisotropic Inflation
  The gravitational baryogensis may not generate a sufficient baryon asymmetry
in the standard thermal history of the Universe when we take into account the
gravitino problem. Hence it has been suggested that anisotropy of the Universe
can enhance the generation of the baryon asymmetry through the increase of the
time change of the Ricci scalar curvature. We study the gravitational
baryogenesis in the presence of anisotropy, which is produced at the end of an
anisotropic inflation. Although we confirm that the generated baryon asymmetry
is enhanced compared with the original isotropic cosmological model, taking
into account the constraint on the anisotropy by the recent CMB observations,
we find that it is still difficult to obtain the observed baryon asymmetry only
through the gravitational baryogenesis without suffering from the gravitino
problem.
