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Non-Gaussianity from instant and tachyonic preheating

Enqvist, Kari and Jokinen, Asko and Mazumdar, Anupam and Multamaki, Tuomas and Vaihkonen, Antti (2005) Non-Gaussianity from instant and tachyonic preheating. Journal of Cosmology and Astroparticle Physics, 2005 (3). ISSN 1475-7516

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Abstract

We study non-Gaussianity in two distinct models of preheating: instant and tachyonic. In instant preheating non-Gaussianity is sourced by the local terms generated through the coupled perturbations of the two scalar fields. We find that the non-Gaussianity parameter is given by $f_{NL}^{\phi}\sim 2g

Item Type: Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Additional Information: 12 pages, 1 figure, additional discussion, improved constraint on the scale of tachyonic preheating
Uncontrolled Keywords: cosmological perturbation theory ; physics of the early universe
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 55931
Deposited By: ep_importer_pure
Deposited On: 17 Jul 2012 16:31
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 20:44
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/55931

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