Speaker
Karl-Peter Marzlin
(St. Francis Xavier University)
Description
It is a well-known fact that quantum field theory usually requires renormalization to deal with divergent terms in perturbation theory. For relativistic quantum systems, Epstein and Glaser have proposed causal perturbation theory (CPT) as a method to avoid divergences before they occur. The key part of this method is to employ distribution splitting to define retarded and advanced propagators. In this talk I will describe how CPT can be used to provide a finite perturbation theory for quantum optical systems consisting of atoms or molecules and light.
