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Non-linear isocurvature perturbations and non-Gaussianities

David Langlois 1 F. Vernizzi D. Wands
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : 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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Submitted on : Monday, October 13, 2008 - 2:42:09 PM
Last modification on : Wednesday, October 21, 2020 - 4:32:12 PM

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David Langlois, F. Vernizzi, D. Wands. Non-linear isocurvature perturbations and non-Gaussianities. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2008, 12, pp.004. ⟨10.1088/1475-7516/2008/12/004⟩. ⟨in2p3-00329812⟩



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