- Sin-Itiro Tomonaga
name = Sin-Itiro Tomonaga (朝永 振一郎)
birth_date = Birth date|1906|3|31
death_date = Death date and age|1979|7|8|1906|3|31
death_place = Tokyo, Japan
Institute for Advanced Study
Tokyo University of Education
alma_mater = Kyoto Imperial University
Nobel Prize in Physics(1965)
Sin-Itiro Tomonaga or Shinichirō Tomonaga (朝永 振一郎 "Tomonaga Shin'ichirō",
March 31, 1906– July 8, 1979) was a Japanese physicist, influential in the development of quantum electrodynamics, work for which he was jointly awarded the Nobel Prize in Physicsin 1965 along with Richard Feynmanand Julian Schwinger.
Tomonoga was born in
Tokyoin 1906. He was the second child and eldest boy of a Japanese philosopher, Sanjūrō Tomonaga. He entered the Kyoto Imperial University in 1926. Hideki Yukawa, also a Nobel Prizewinner, was one of his classmates during undergraduateschool. During graduate school at the same university, he worked as an assistant in the university for three years. After graduate school, he joined Nishina's group in Riken. In 1937, while working in Leipzig, he collaborated with the research group of Werner Heisenberg. Two years later, he returned to Japan due to the outbreak of the Second World War, but finished his doctoral degree on the study of nuclear materials with his thesis on work he had done while in Leipzig.
In Japan, he was appointed to a professorship in the Tokyo University of Education (a forerunner of
Tsukuba University). During the war he studied the magnetron, mesontheory, and his "super-many-time" theory. In 1948, he and his students re-examined a 1939 paper by Sidney Dancoffthat attempted, but failed, to show that the infinite quantities that arise in QED can be canceled with each other. Tomonaga applied his super-many-time theory and a relativistic method based on the non-relativistic method of Wolfgang Pauliand Fierz to greatly speed up and clarify the calculations. Then he and his students found that Dancoff had overlooked one term in the perturbation series. With this term, the theory gave finite results; thus Tomonaga discovered the renormalizationmethod independently of Julian Schwingerand calculated physical quantities such as the Lamb shiftat the same time.
In the next year, he was invited by
Robert Oppenheimerto work at the Institute for Advanced Studyin Princeton Township. He studied a many-body problemon the collective oscillations of a quantum-mechanical system. In the following year, he returned to Japan and proposed the Tomonaga-Luttinger liquid. In 1965, he was awarded the Nobel Prize in Physics, with Julian Schwingerand Richard P. Feynman, for the study of QED, specifically for the discovery of the renormalizationmethod. He died in Tokyoin 1979.
*Schweber, Sylvan S., 1994. "QED and the men who made it : Dyson, Feynman, Schwinger, and Tomonaga". Princeton Univ. Press.
* [http://nobelprize.org/nobel_prizes/physics/laureates/1965/tomonaga-lecture.html Tomonaga's Nobel Prize Lecture]
* [http://www.nobel.se/physics/laureates/1965/tomonaga-bio.html Nobel Prize biography]
* [http://physics.nobel.brainparad.com/shinitiro_tomonaga.html Shinichiro Tomonaga]
* [http://holiker.narod.ru/five/tomonaga-lecture.html fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles.]
Wikimedia Foundation. 2010.