Publication : t02/115

Non-Gaussianity in multifield inflation

Bernardeau F. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Uzan J.-P. (Laboratoire de Physique Théorique (LPT), CNRS, UMR 8627, Université de Paris-Sud XI, F-91405 Orsay, France)
This article investigates the generation of non-Gaussianity during inflation. In the context of multi-field inflation, we detail a mechanism that can create significant primordial non-Gaussianities in the adiabatic mode while preserving the scale invariance of the power spectrum. This mechanism is based on the generation of non-Gaussian isocurvature fluctuations which are then transfered to the adiabatic modes through a bend in the classical inflaton trajectory. Natural realizations involve quartic self-interaction terms for which a full computation can be performed. The expected statistical properties of the resulting metric fluctuations are shown to be the superposition of a Gaussian and a non-Gaussian contribution of the same variance. The relative weight of these two contributions is related to the total bending in field space. We explicit the non-Gaussian probability distribution function which appears to be described by a single new parameter. Only two new parameters therefore suffice in describing the non-Gaussianity.
Année de publication : 2002
Revue : Phys. Rev. D 66 103506 (2002)
DOI : 10.1103/PhysRevD.66.103506
Preprint : arXiv:hep-ph/0207295
Lien :
PACS : 98.80.-k 98.80.Cq 98.80.Es 98.65.Dx
Langue : Anglais

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