Non-Gaussianity from Preheating

Details Non-Gaussianity from Preheating Non-Gaussianity from Preheating

2004-11-15

arxiv.org/abs/astro-ph/0411394v2

Phys.Rev.Lett. 94 (2005) 161301

Astronomy and Astrophysics

Astrophysics

4 pages ReVTeX4, discussion and references added, conclusions unchanged

Scientific paper

10.1103/PhysRevLett.94.161301

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.

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