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- W1973155898 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." @default.
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- W1973155898 date "2008-12-02" @default.
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- W1973155898 title "Non-linear isocurvature perturbations and non-Gaussianities" @default.
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- W1973155898 doi "https://doi.org/10.1088/1475-7516/2008/12/004" @default.
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