Non-Gaussianity beyond slow roll in multi-field inflation

Byrnes, Christian T and Tasinato, Gianmassimo (2009) Non-Gaussianity beyond slow roll in multi-field inflation. Journal of Cosmology and Astroparticle Physics, 2009 (08). 016-016. ISSN 1475-7516

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Abstract

We study the non-Gaussianity generated during multiple-field inflation. We provide an exact expression for the bispectrum parameter fNL which is valid beyond the slow-roll regime, valid for certain classes of inflationary models. We then study a new, exact multi-field inflationary model considering a case where the bispectrum grows to observable values at the end of inflation. We show that in this case the trispectrum is also large and may even provide the dominant signal of non-Gaussianity

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Christian Byrnes
Date Deposited: 14 Nov 2012 14:58
Last Modified: 14 Nov 2012 14:58
URI: http://sro.sussex.ac.uk/id/eprint/42465
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