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Non-Gaussianity from instant and tachyonic preheating

Research output: Contribution to journalJournal article

Published

Journal publication date31/03/2005
JournalJournal of Cosmology and Astroparticle Physics
Journal number3
Volume2005
Number of pages11
Original languageEnglish

Abstract

We study non-Gaussianity in two distinct models of preheating: instant and tachyonic. In instant preheating non-Gaussianity is sourced by the local terms generated through the coupled perturbations of the two scalar fields. We find that the non-Gaussianity parameter is given by $f_{NL}^{\phi}\sim 2g

Bibliographic note

12 pages, 1 figure, additional discussion, improved constraint on the scale of tachyonic preheating