The Radiation Theories of Tomonaga, Schwinger, and Feynman
Abstract
A unified development of the subject of quantum electrodynamics is outlined, embodying the main features both of the TomonagaSchwinger and of the Feynman radiation theory. The theory is carried to a point further than that reached by these authors, in the discussion of higher order radiative reactions and vacuum polarization phenomena. However, the theory of these higher order processes is a program rather than a definitive theory, since no general proof of the convergence of these effects is attempted. The chief results obtained are (a) a demonstration of the equivalence of the Feynman and Schwinger theories, and (b) a considerable simplification of the procedure involved in applying the Schwinger theory to particular problems, the simplification being the greater the more complicated the problem.
 Publication:

Physical Review
 Pub Date:
 February 1949
 DOI:
 10.1103/PhysRev.75.486
 Bibcode:
 1949PhRv...75..486D