APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Richard Bond (CITA, University of Toronto)
Title: The Kinematics of Inflation, Preheating and Heating: a Playground for Kolmogorov-Sinai and Shannon Entropies
Date (JST): Thu, Nov 29, 2018, 15:30 - 17:30
Place: Seminar Room B
Related File: 2209.pdf
Abstract: We have a good story, even with evidence, that all structure in the universe evolved from the diffusion of quantum-fluctuations that broke the adiabaticity of coarse-grained kinematic field trajectories during inflation. I will describe the use of dynamical systems theory to understand the subsequent complex linear preheating epoch, using Kolmogorov-Sinai entropy to measure the various instabilities that can arise, followed by the highly nonlinear classical-fluctuation generation during heating, as measured by coarse-grained Shannon entropy (the entropy we observe here and now). I will extend the kinematical entropic picture to short-lived instabilities while inflation is ongoing and their impact. A possible observable manifestation is non-standard non-Gaussianities of a form that are not strongly constrained so far with CMB, and that may be better constrained by Large Scale Structure Surveys.