The scattering operator of Feynman and Dyson for a self-interacting neutral scalar field is derived from a Lagrangian without the use of a canonical transformation between the Heisenberg and interaction pictures.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.