Seminars & Lectures
| * TITLE | The origin of density fluctuations after Planck | ||||||
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| * DATE / TIME | 2013-04-03, 11:00 am, 503 conference room | ||||||
| * ABSTRACT | |||||||
| We discuss the issue toward understanding the origin of density fluctuations in the light of recent Planck results, focusing on spectator field (light field) models such as the curvaton and so on. Implications of Planck constraints on the spectral index and non-Gaussianity are argued. We also talk about possibilities that trispectrum appears as the first signature of the non-Gaussianities. Furthermore, we discuss the tensor-to-scalar ratio in a small-field inflation model with a light scalar field and argue that relatively large one can be generated due to the suppression of inflaton-induced fluctuations. A generalized form of the Lyth bound is also presented. |
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