Primordial non-Gaussianities in single-field inflation

Seery, David and Lidsey, James E (2005) Primordial non-Gaussianities in single-field inflation. Journal of Cosmology and Astroparticle Physics, 2005 (6). ISSN 1475-7516

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Abstract

We calculate the three-point function for primordial scalar fluctuations in a single-field inflationary scenario where the scalar field Lagrangian is a completely general function of the field and its first derivative. We obtain an explicit expression for the three-point correlation function in a self-consistent approximation scheme where the expansion rate varies slowly, analogous to the slow-roll limit in standard, single-field inflation. The three-point function can be written in terms of the familiar slow-roll parameters and three new parameters which measure the non-trivial kinetic structure of the scalar field, the departure of the speed of sound from the speed of light, and the rate of change of the speed of sound.

Item Type: Article
Additional Information: Article Number: 003
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: David Seery
Date Deposited: 06 Feb 2012 19:13
Last Modified: 02 Apr 2012 08:35
URI: http://sro.sussex.ac.uk/id/eprint/19612
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