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On non-Gaussianities in multi-field inflation (N fields): bi- and tri-spectra beyond slow-roll

Diana Battefelda,b and Thorsten Battefeldb

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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 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.

Keywords

non-gaussianity

cosmological perturbation theory

inflation

 

E-print Number: 0908.4269

Cited: by |

Refers: to

PACS

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

98.70.Vc Background radiations

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 11 (November 2009)

Received 7 September 2009, accepted for publication 13 October 2009

Published 10 November 2009



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