3-8 June 2012
Hotel Fiesta Americana
Mexico/General timezone
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Contribution Contributed (oral)

Hotel Fiesta Americana - Mérida
Cosmology

Density Perturbations from Curvatons Revisited

Speakers

  • Dr. Takeshi KOBAYASHI

Primary authors

Abstract content

The curvaton scenario provides a simple explanation for the generation of the cosmological perturbations, however most works have focused on cases with rather trivial curvaton energy potentials, e.g. quadratic ones. In this talk I will present the rich phenomenology of curvatons by showing that non-quadratic curvatons exhibit new behaviors, leading to interesting signals in the resulting density perturbations. Especially, I will show that curvaton potentials that are flatter compared to a quadratic lead to enhancement of the linear and second-order density perturbations, while steepend potentials can generate strongly scale-dependent non-Gaussianity. Our analyses are analytic, and thus provide a systematic framework for studying curvatons in general.