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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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Official URL: http://dx.doi.org/10.1088/1475-7516/2008/03/014
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 |
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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 |