Decay Rate & Dyson Series

This lecture covers the concepts of cross section, decay rate, and Dyson series in the context of turbulence. The instructor explains the computation of cross section and lifetime, asymptotic states, and the application of the Dyson series in perturbation theory. The lecture delves into the intricacies of integrating and interpreting the results, emphasizing the importance of proper split and Lorentz invariance. The discussion also touches on the challenges of ordering space-like events and the significance of consolity in physical operators.