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

[img]
Preview
PDF
PhysRevLett.94.161301.pdf - Published Version

Download (92kB)

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:
ID Code:
63493
Deposited By:
Deposited On:
01 May 2013 13:21
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Sep 2020 02:35