Enhanced tensor non-Gaussianities in presence of a source
arXiv:1906.08558 · doi:10.1140/epjc/s10052-020-08735-9
Abstract
We address the possibility of having an enhanced signal for tensor non-Gaussianities in presence of a source, as a signature of Primordial Gravitational Waves. We employ a nearly model-independent framework based on Effective Field Theory of inflation and compute tensor non-Gaussianities therefrom sourced by particle production during (p)reheating to arrive at an enhanced signal strength. We obtain the model-independent non-linearity parameters and also find that squeezed limit bispectra are more enhanced than equilateral limit.
arXiv comment8 pages, 2 figures, Typos corrected, Minor modifications
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