Non-Gaussianity from Preheating
Enqvist, Kari · Jokinen, Asko · Mazumdar, Anupam · Multamaki, Tuomas · Vaihkonen, Antti
Original · EN
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 fNL 50. Our results may provide a useful test of preheating in future CMB experiments.
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