462 citations · 2k across the 32 of their papers we have counts for
4 papers · 1 filter
Constraining Light Gravitino Mass from Cosmic Microwave Background
Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama +2
We investigate the possibilities of constraining the light gravitino mass m_{3/2} from future cosmic microwave background (CMB) surveys. A model with light gravitino with the mass…
Axion isocurvature fluctuations with extremely blue spectrum
Shinta Kasuya, Masahiro Kawasaki
We construct an axion model for generating isocurvature fluctuations with blue spectrum, n_{iso}=2-4, which is suggested by recent analyses of admixture of adiabatic and isocurvatu…
Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter
Masahiro Kawasaki, Kazunori Kohri, Kazunori Nakayama
We study the annihilating dark matter contribution to the extra-galactic diffuse gamma-ray background spectrum, motivated by the recent observations of cosmic-ray positron/electron…
Axion braneworld cosmology
Cosimo Bambi, Masahiro Kawasaki, Federico R. Urban
We study axion cosmology in a 5D Universe, in the case of flat and warped extra dimension. The comparison between theoretical predictions and observations constrains the 5D axion d…