On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll

Details On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll

2009-08-31

arxiv.org/abs/0908.4269v3

JCAP 0911:010,2009

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, 3 figures. V3: labels in Fig.1-3 corrected over JCAP version (sign of fNL)

Scientific paper

10.1088/1475-7516/2009/11/010

We compute analytic expressions for the non-linearity parameters characterizing the bi- and tri-spectrum of primordial curvature perturbations generated during an inflationary epoch of the early universe driven by an arbitrary number of fields. We assume neither slow roll nor a separable potential; instead, to compute Non-Gaussianities, we assume a separable Hubble parameter. We apply the formalism to an exact solvable toy-model and show under which conditions observably large non-Gaussianities are produced.

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