Shin'ichirō Tomonaga

Shin'ichirō Tomonaga was a Japanese theoretical physicist who developed a relativistically invariant formulation of quantum electrodynamics and shared the 1965 Nobel Prize in Physics.

Connect

Julian Schwinger: An American theoretical physicist who independently developed a renormalized formulation of quantum electrodynamics. Schwinger shared the 1965 Nobel Prize with Tomonaga and Richard Feynman for independent QED advances.
Quantum electrodynamics: The quantum field theory describing interactions between electrically charged particles and electromagnetic radiation. Tomonaga’s Nobel-recognized work provided a consistent framework for this theory.
Tokyo Imperial University: A Japanese university founded in 1877, later renamed the University of Tokyo. Tomonaga studied physics there and completed his doctorate.
1965 Nobel Prize in Physics: The Nobel Prize awarded to Sin-Itiro Tomonaga, Julian Schwinger, and Richard Feynman for foundational work in quantum electrodynamics. The award recognized Tomonaga’s independent contribution to renormalized QED.
Richard Feynman: An American theoretical physicist known for quantum electrodynamics and the path-integral formulation of quantum mechanics. Feynman’s independent QED methods were honored alongside Tomonaga’s in the same Nobel Prize.
Renormalization: A set of methods that absorbs infinities in quantum field calculations into measurable parameters. Tomonaga showed how renormalization could yield finite physical predictions in QED.
Institute of Physical and Chemical Research: A Japanese research institute founded in 1917, commonly known as RIKEN. Tomonaga worked at RIKEN, where he developed his approach to quantum electrodynamics.
Sōmiya Kōkichi: A Japanese physicist who succeeded Tomonaga as president of the Science Council of Japan. Sōmiya followed Tomonaga in a leadership role connecting Japanese science with national policy.
Hideki Yukawa: A Japanese theoretical physicist who proposed the meson theory of the nuclear force and won the 1949 Nobel Prize in Physics. Yukawa was Tomonaga’s colleague in Japan’s emerging theoretical-physics community.
Tomonaga–Schwinger equation: A relativistic equation describing the evolution of quantum states across spacelike hypersurfaces. It expresses the covariant evolution scheme central to Tomonaga’s formulation.