Feynman, Schwinger, and Tomonaga Complete Quantum Electrodynamics
Three physicists, working independently on three continents, all fix the same broken theory of light and matter
Quick facts
- Key physicists
- Julian Schwinger, Sin-Itiro Tomonaga, Richard Feynman
- Technique
- Renormalization
- Feynman's tool
- Feynman diagrams
- Recognition
- Nobel Prize in Physics, 1965, shared
What happened
After the Second World War, physicists trying to apply quantum theory to the interaction of light and charged particles kept running into equations that predicted infinite, meaningless results. Working independently, Julian Schwinger in the United States, Sin-Itiro Tomonaga in Japan, and Richard Feynman, also in the United States, each solved the problem in a different mathematical style between the late 1940s and the mid-1950s. Schwinger used a technique called renormalization, which, according to a National MagLab history of the period, rid the quantum field theory developed by Paul Dirac of serious incongruities with experimental observations that had nearly prompted the scientific community to abandon it. Feynman's approach used intuitive diagrams, now called Feynman diagrams, which MacTutor describes as graphic analogues of the mathematical expressions needed to describe the behaviour of systems of interacting particles. All three approaches were later shown to be mathematically equivalent, together forming quantum electrodynamics, or QED.
Why it matters
Quantum electrodynamics became the first quantum field theory whose predictions matched experiment to extraordinary precision, and its renormalization technique became a template used to build every quantum field theory since, including the Standard Model. The 1965 Nobel Prize in Physics recognized all three physicists jointly, MacTutor records, for fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles.
How we know
Schwinger's, Tomonaga's, and Feynman's original papers on renormalized quantum electrodynamics were published between 1947 and the early 1950s in journals including Physical Review and Progress of Theoretical Physics, and their mathematical equivalence was demonstrated directly by Freeman Dyson in a 1949 paper connecting all three approaches.
Sources
- MacTutor History of Mathematics, University of St Andrews. Richard Phillips Feynman (1918 - 1988) · Primary source (author-declared)mathshistory.st-andrews.ac.uk · Cited as a "primary" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
- Magnet Academy, National High Magnetic Field Laboratory. Julian Schwinger · General sourcenationalmaglab.org · Cited as a "reference" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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