Evolution of non-Gaussianity in multi-scalar field models

Details Evolution of non-Gaussianity in multi-scalar field models Evolution of non-Gaussianity in multi-scalar field models

2011-07-12

arxiv.org/abs/1107.2270v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 2 figures, to appear in International Journal of Modern Physics A

Scientific paper

We study the evolution of non-Gaussianity in multiple-field inflationary models, focusing on three fundamental questions: (a) How is the sign and peak magnitude of the non-linearity parameter fNL related to generic features in the inflationary potential? (b) How sensitive is fNL to the process by which an adiabatic limit is reached, where the curvature perturbation becomes conserved? (c) For a given model, what is the appropriate tool -- analytic or numerical -- to calculate fNL at the adiabatic limit? We summarise recent results obtained by the authors and further elucidate them by considering an inflection point model.

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