Primordial non-gaussianities from multiple-field inflation

Details Primordial non-gaussianities from multiple-field inflation Primordial non-gaussianities from multiple-field inflation

2005-06-02

arxiv.org/abs/astro-ph/0506056v2

JCAP0509:011,2005

Astronomy and Astrophysics

Astrophysics

24 pages, JCAP LaTeX style; replaced with version accepted by JCAP. Some corrections to Sections 2 and 5, conclusions unchange

Scientific paper

10.1088/1475-7516/2005/09/011

We calculate the three-point correlation function evaluated at horizon crossing for a set of interacting scalar fields coupled to gravity during inflation. This provides the initial condition for the three-point function of the curvature perturbation in the Sasaki--Stewart \delta N formulation. We find that the effect is small, of the order of a slow-roll parameter, and that the non-gaussianity can be determined on large scales once the unperturbed background evolution is known. As an example of the use of our formalism, we calculate the primordial non-gaussianity arising in a model of assisted inflation.

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