Primordial non-Gaussianities

Details Primordial non-Gaussianities Primordial non-Gaussianities

2011-02-24

arxiv.org/abs/1102.5052v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Invited talk at YKIS (Yukawa International Seminar) 2010: "Cosmology -The Next Generation-", 28 June - 2 July 2010, Kyoto, Jap

Scientific paper

This contribution gives an overview on primordial non-Gaussianities from a theoretical perspective. After presenting a general formalism to describe nonlinear cosmological perturbations, several classes of models, illustrated with examples, are discussed: multi-field inflation with non-standard Lagrangians, modulaton fields, curvaton fields. In the latter case, a special emphasis is put on the isocurvature perturbations, which could leave a specific signature in non-Gaussianities.

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