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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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    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
    Departments: Faculty of Science and Technology > Physics
    ID Code: 63493
    Deposited By: ep_importer_pure
    Deposited On: 01 May 2013 14:21
    Refereed?: Yes
    Published?: Published
    Last Modified: 16 Nov 2018 00:21
    Identification Number:

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