119 citations · 479 across the 10 of their papers we have counts for
6 papers · 1 filter
Hilltop Non-Gaussianity
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu Takahashi
We study non-Gaussianity induced by a pseudo Nambu-Goldstone boson with a cosine-type scalar potential. We focus on how the non-Gaussianity is affected when the pseudo Nambu-Goldst…
Non-Gaussianity from Baryon Asymmetry
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu Takahashi
We study a scenario that large non-Gaussianity arises from the baryon asymmetry of the Universe. There are baryogenesis scenarios containing a light scalar field, which may result…
Inhomogeneous baryogenesis, cosmic antimatter, and dark matter
A. D. Dolgov, M. Kawasaki, N. Kevlishvili
A model of inhomogeneous baryogenesis based on the Affleck and Dine mechanism is described. A simple coupling of the scalar baryon field to the inflaton allows for formation of ast…
Electron and Photon Energy Deposition in Universe
Toru Kanzaki, Masahiro Kawasaki
We consider energy deposition of high energy electrons and photons in universe. We carry out detailed calculations of fractions of the initial energy of the injected electron or ph…
Big-Bang Nucleosynthesis and Gravitino
Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi +1
We derive big-bang nucleosynthesis (BBN) constraints on both unstable and stable gravitino taking account of recent progresses in theoretical study of the BBN processes as well as…
Solving Cosmological Problems of Supersymmetric Axion Models in an Inflationary Universe
Masahiro Kawasaki, Kazunori Nakayama
We revisit inflationary cosmology of axion models in the light of recent developments on the inflaton decay in supergravity. We find that all the cosmological difficulties, includi…