Non-Gaussianity in multi-field inflation

Details Non-Gaussianity in multi-field inflation Non-Gaussianity in multi-field inflation

2002-07-24

arxiv.org/abs/hep-ph/0207295v1

Phys.Rev. D66 (2002) 103506

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, RevTeX, 5 figures included

Scientific paper

10.1103/PhysRevD.66.103506

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.

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