Non-Gaussianity of inflationary field perturbations from the field equation

Seery, David, Malik, Karim A and Lyth, David H (2008) Non-Gaussianity of inflationary field perturbations from the field equation. Journal of Cosmology and Astroparticle Physics, 2008 (3). ISSN 14757516

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Abstract

We calculate the tree-level bispectrum of the inflaton field perturbation directly from the field equations, and construct the corresponding f NL parameter. Our results agree with previous ones derived from the Lagrangian. We argue that quantum theory should only be used to calculate the correlators when they first become classical a few Hubble times after horizon exit, the classical evolution taking over thereafter

Item Type: Article
Additional Information: Article number 014
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: David Seery
Date Deposited: 06 Feb 2012 20:30
Last Modified: 02 Apr 2012 09:35
URI: http://sro.sussex.ac.uk/id/eprint/26242
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