Speaker
Pulkit Ghoderao
(Imperial College London)
Description
Preheating involves the rapid production of daughter particles after the end of inflation. Combining lattice simulations with a non-perturbative delta N treatment, I will describe a general formalism to calculate the non-Gaussianity generated by preheating in the presence of a single light scalar field. When scale dependence during inflation is included, our results show that cosmic variance, i.e., the contribution from modes with wavelength longer than the size of the observable universe today, plays a key role in determining the non-Gaussianity. I will illustrate our formalism by applying it to an observationally-viable model of preheating that is motivated by non-minimal coupling to gravity, and present its full parameter dependence.
Authors
Pulkit Ghoderao
(Imperial College London)
Prof.
Arttu Rajantie
(Imperial College (GB))
