Answers are grounded in this paper and cite their sources.
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) approximately 50. Our results may provide a useful test of preheating in future cosmic microwave background experiments.
No takes yet. Share an insight, caveat, or question.
Enqvist et al. (2005) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: