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Dark Energy Evolution and the Curvature of the Universe from Recent Observations
Kazuhide Ichikawa, Tomo Takahashi
We discuss the constraints on the time-varying equation of state for dark energy and the curvature of the universe using observations of type Ia supernovae from Riess et al. and th…
On the Determination of Neutrino Masses and Dark Energy Evolution from the Cross Correlation of CMB and LSS
Kazuhide Ichikawa, Tomo Takahashi
We discuss the possibilities of the simultaneous determination of the neutrino masses and the evolution of dark energy from future cosmological observations such as cosmic microwav…
Implications of the Curvaton on Inflationary Cosmology
Takeo Moroi, Tomo Takahashi
We study implications of the curvaton, a late-decaying light scalar field, on inflationary cosmology, paying particular attentions to modifications of observable quantities such as…
Relaxing Constraints on Inflation Models with Curvaton
Takeo Moroi, Tomo Takahashi, Yoshikazu Toyoda
We consider the effects of the curvaton, late-decaying scalar condensation, to observational constraints on inflation models. From current observations of cosmic density fluctuatio…