Theory Seminar

KEK 素粒子原子核研究所・理論セミナー



TITLE Probing the early Universe with isocurvature fluctuations and non-Gaussianity
(in English)
SPEAKER Dr. Tomo Takahashi
(Saga University)
DATE: May 24 (Tue.) 16:00 − 17:00
PLACE: Kenkyu Honkan 1F, Meeting Room 1



    ABSTRACT

I discuss primordial fluctuations and its non-Gaussianity in models with isocurvature perturbations. First I describe a general formalism which can give a systematic calculation of non-linear perturbations in models with isocurvature fluctuations. Then I discuss isocurvature fluctuations and non-Gaussianity in the mixed curvaton and inflaton model where the curvaton and the inflaton are both responsible for cosmic density fluctuations. The issue of differentiating CDM and baryon isocurvature modes using 21 cm fluctuations is also briefly discussed.

References: D. Langlois, T. Takahashi, arXiv:1012.4885 M. Kawasaki, T. Sekiguchi, T. Takahashi, arXiv:1104.5591