Speaker
Mr
Ryosuke Sato
(Univ. Of Tokyo)
Description
The asymmetric dark matter scenario is known to give an interesting
solution for the cosmic coincidence problem between baryon and dark
matter densities. In the scenario, the dark matter asymmetry, which is
translated to the dark matter density in the present universe, is
transferred from the B-L asymmetry generated in the early universe. On
the other hand, the generation of the B-L asymmetry is simply assumed,
though many mechanisms for the generation are expected to be
consistent with the scenario. We show that the generation of the
asymmetry in the sneutrino inflation scenario works similarly to the
asymmetric dark matter scenario, because the non-renormalizable
operator which translates the B-L asymmetry to the dark matter
asymmetry is naturally obtained by integrating right-handed neutrinos
out. As a result, important issues concerning cosmology (inflation,
the mass density of dark matter, and the baryon asymmetry of the
universe) as well as neutrino masses and mixing have a unified origin,
namely, the right-handed neutrinos.
Primary author
Mr
Ryosuke Sato
(Univ. Of Tokyo)