Schwinger, Tomonaga, Feynman, and Dyson: the triumph of renormalization
Barely six months after the Shelter Island Conference, which reawakened his interest in quantum electrodynamics (QED), and just three months after returning to Harvard University from his extended honeymoon to the West Coast, Julian Schwinger published a one-page note in the Physical Review entitled ‘On quantum electrodynamics and the magnetic moment of the electron’. A preliminary account of this work was presented by Schwinger at the 10th Washington Conference on Theoretical Physics in November 1947, which attracted the interest of J. Robert Oppenheimer and Richard Feynman. This chapter looks at Schwinger's method of canonical transformations, his covariant approach to QED, Sin-itiro Tomonaga's covariant formulation of quantum field theory, Feynman's theory of positrons and his space-time approach to quantum electrodynamics, Freeman Dyson's research on the radiation theories of Schwinger, Tomonaga, and Feynman, and the synergism between the works of Feynman and Schwinger with respect to QED.
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