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5 papers · 1 filter
Primordial Trispectrum from Isocurvature Fluctuations
David Langlois, Tomo Takahashi
We study non-Gaussianity generated by adiabatic and isocurvature primordial perturbations. We first obtain, in a very general setting, the non-linear perturbations, up to third ord…
On Classification of Models of Large Local-Type Non-Gaussianity
Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi +1
We classify models generating large local-type non-Gaussianity into some categories by using some "consistency relations" among the non-linearity parameters f_{NL}^{local}, τ_{NL}^…
Scale-dependence of Non-Gaussianity in the Curvaton Model
Christian T. Byrnes, Kari Enqvist, Tomo Takahashi
We investigate the scale-dependence of f_NL in the self-interacting curvaton model. We show that the scale-dependence, encoded in the spectral index n_{f_NL}, can be observable by…
Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
Tomo Takahashi, Masahide Yamaguchi, Shuichiro Yokoyama
We investigate primordial non-Gaussianity and dark matter isocurvature fluctuations in the modulated reheating and the curvaton scenarios. In these scenarios, large non-Gaussianity…
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…