Senami, Masato, Takayama, Tsutomu
We reconsidered leptogenesis scenario from right-handed (s)neutrino produced by the decay of inflaton. Besides the well-investigated case that the neutrino decays instantaneously after the...
Senami, Masato, Takayama, Tsutomu
Leptogenesis via non-thermally produced right-handed (s)neutrino is surveyed systematically. In particular, we focus on leptogenesis scenarios from right-handed (s)neutrino produced by the decay of...
Kawaguchi, Toshihiro, Kawasaki, Masahiro, Takayama, Tsutomu, Yamaguchi, Masahide, Yokoyama, Jun'ichi
Formation of primordial black holes (PBHs) on astrophysical mass scales is a natural consequence of inflationary cosmology if the primordial perturbation spectrum has a large and negative running of...
Affleck-Dine leptogenesis via multiscalar evolution in a supersymmetric seesaw model (2007)
Senami, Masato, Takayama, Tsutomu
A leptogenesis scenario in a supersymmetric standard model extended with introducing right-handed neutrinos is reconsidered. Lepton asymmetry is produced in the condensate of a right-handed sneutrino...
Senami, Masato, Takayama, Tsutomu
A baryogenesis scenario in supersymmetric standard models with Dirac neutrinos proposed by Abel and Page is reconsidered with introducing intermediate scale physics to stabilize the runaway potential...
Power Spectrum of the Density Perturbations From Smooth Hybrid New Inflation Model (2006)
Kawasaki, Masahiro, Takayama, Tsutomu, Yamaguchi, Masahide, Yokoyama, Jun'ichi
We numerically investigate density perturbations generated in the smooth hybrid new inflation model, a kind of double inflation model that is designed to reproduce the running spectral index...