Thermal effects and sudden decay approximation in the curvaton scenario

Naoya Kitajima, David Langlois, Tomo Takahashi, Tomohiro Takesako, Shuichiro Yokoyama

研究成果: Article査読

4 被引用数 (Scopus)

抄録

We study the impact of a temperature-dependent curvaton decay rate on the primordial curvature perturbation generated in the curvaton scenario. Using the familiar sudden decay approximation, we obtain an analytical expression for the curvature perturbation after the decay of the curvaton. We then investigate numerically the evolution of the background and of the perturbations during the decay. We first show that the instantaneous transfer coefficient, related to the curvaton energy fraction at the decay, can be extended into a more general parameter, which depends on the net transfer of the curvaton energy into radiation energy or, equivalently, on the total entropy ratio after the complete curvaton decay. We then compute the curvature perturbation and compare this result with the sudden decay approximation prediction.

本文言語English
論文番号032
ジャーナルJournal of Cosmology and Astroparticle Physics
2014
10
DOI
出版ステータスPublished - 2014 10 1

ASJC Scopus subject areas

  • 天文学と天体物理学

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