Non-Gaussianity from preheating -: art. no. 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)approximate to 50. Our results may provide a useful test of preheating in future cosmic microwave background experiments.