Non-linear isocurvature perturbations and non-Gaussianities

Details Non-linear isocurvature perturbations and non-Gaussianities Non-linear isocurvature perturbations and non-Gaussianities

2008-09-26

arxiv.org/abs/0809.4646v2

JCAP 0812:004,2008

Astronomy and Astrophysics

Astrophysics

24 pages, typos corrected, references added

Scientific paper

10.1088/1475-7516/2008/12/004

We study non-linear primordial adiabatic and isocurvature perturbations and their non-Gaussianity. After giving a general formulation in the context of an extended delta N-formalism, we analyse in detail two illustrative examples. The first is a mixed curvaton-inflaton scenario in which fluctuations of both the inflaton and a curvaton (a light isocurvature field during inflation) contribute to the primordial density perturbation. The second example is that of double inflation involving two decoupled massive scalar fields during inflation. In the mixed curvaton-inflaton scenario we find that the bispectrum of primordial isocurvature perturbations may be large and comparable to the bispectrum of adiabatic curvature perturbations.

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