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): 161301. 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.