Non-Gaussianity from preheating

Enqvist, Kari and Jokinen, Asko and Mazumdar, Anupam and Multamaki, Tuomas and Vaihkonen, Antti (2005) Non-Gaussianity from preheating. Physical review letters, 94 (16). ISSN 1079-7114

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Abstract

We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local terms generated through the coupled perturbations. We argue that the non-Gaussianity parameter could be as large as f_{NL} ~ 50. Our results may provide a useful test of preheating in future CMB experiments.

Item Type: Journal Article
Journal or Publication Title: Physical review letters
Additional Information: © 2005 The American Physical Society 4 pages ReVTeX4, discussion and references added, conclusions unchanged
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63493
Deposited By: ep_importer_pure
Deposited On: 01 May 2013 13:21
Refereed?: Yes
Published?: Published
Last Modified: 23 Feb 2020 01:57
URI: https://eprints.lancs.ac.uk/id/eprint/63493

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