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Non-Gaussianity from preheating

Research output: Contribution to journalJournal article

Published

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Journal publication date29/04/2005
JournalPhysical Review Letters
Journal number16
Volume94
Number of pages4
Original languageEnglish

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.

Bibliographic note

© 2005 The American Physical Society 4 pages ReVTeX4, discussion and references added, conclusions unchanged