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Non-Gaussianity from instant and tachyonic preheating

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>31/03/2005
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number3
Number of pages11
<mark>Original language</mark>English


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