David Langlois et al JCAP12(2008)004 doi:10.1088/1475-7516/2008/12/004
David Langlois1, Filippo Vernizzi2 and David Wands3
Show affiliationsWe study non-linear primordial adiabatic and isocurvature perturbations and their non-Gaussianity. After giving a general formulation in the context of an extended δN 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.
E-print Number: 0809.4646
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Issue 12 (December 2008)
Received 4 October 2008, accepted for publication 4 November 2008
Published 2 December 2008
David Langlois et al JCAP12(2008)004
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