462 citations · 2k across the 32 of their papers we have counts for
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The Gravitino-Overproduction Problem in Inflaton Decay
Masahiro Kawasaki, Fuminobu Takahashi, T. T. Yanagida
We show that the gravitino-overproduction problem is prevalent among inflation models in supergravity. An inflaton field generically acquires (effective) non-vanishing auxiliary fi…
Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra
Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi
We derive constraint on the effective number of neutrino species N_nu from the cosmic microwave background power spectrum of the WMAP and galaxy clustering power spectrum of the SD…
Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP
Toru Kanzaki, Masahiro Kawasaki, Kazunori Kohri +1
We study the scenario where a sneutrino is the next lightest supersymmetric particle (NLSP) and decays into a gravitino and standard model particles. The daughter particles such as…
Late-time Affleck-Dine baryogenesis after thermal inflation
Masahiro Kawasaki, Kazunori Nakayama
Thermal inflation can solve serious cosmological problems such as overproduction of gravitinos and moduli. However, it also dilutes the preexisting baryon asymmetry. We investigate…
Inflaton Decay through Supergravity Effects
Motoi Endo, Masahiro Kawasaki, Fuminobu Takahashi +1
We point out that supergravity effects enable the inflaton to decay into all matter fields, including the visible and the supersymmetry breaking sectors, once the inflaton acquires…
Towards the robustness of the Affleck-Dine baryogenesis
Shinta Kasuya, Masahiro Kawasaki
We study the Affleck-Dine mechanism with various types of the Kahler potential, and investigate whether or not the Affleck-Dine field could acquire a large VEV as an initial condit…