DUFFIN–KEMMER–PETIAU THEORY IN THE CAUSAL APPROACH
DUFFIN–KEMMER–PETIAU THEORY IN THE CAUSAL APPROACH
In this paper we consider the scalar sector of Duffin–Kemmer–Petiau theory in the framework of Epstein–Glaser causal method. We calculate the lowest order distributions for Compton scattering, vacuum polarization, self-energy and vertex corrections. By requiring gauge invariance of the theory we recover, in a natural way, the scalar propagator of …