Primordial non-Gaussianities from multiple-field inflation

Seery, David and Lidsey, James E (2005) Primordial non-Gaussianities from multiple-field inflation. Journal of Cosmology and Astroparticle Physics, 2005 (9). ISSN 1475-7516

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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.

Item Type: Article
Additional Information: Article Number: 011
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: David Seery
Date Deposited: 06 Feb 2012 20:40
Last Modified: 02 Apr 2012 14:15
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