Speaker
Description
We extend the non-perturbative formalism to calculate non-Gaussianity from preheating. Preheating involves the rapid production of daughter particles after the end of inflation and as such is a non-linear process that requires numerical simulations to capture its dynamics. We obtain initial conditions for simulations by including the time-dependence of Hubble rate during inflation. We find that cosmic variance, which is the variance of modes from start of inflation to when currently observable scale left the horizon, plays a key role in determining the formulation used to extract non-Gaussianity from preheating. We illustrate our method by applying it to an observationally-viable preheating model motivated by non-minimal coupling to gravity, and study its full parameter dependence.
