Sin-Itiro Tomonaga


Sin-Itiro Tomonaga

Infobox Scientist
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name = Sin-Itiro Tomonaga (朝永 振一郎)


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birth_date = Birth date|1906|3|31
birth_place = Tokyo, Japan
death_date = Death date and age|1979|7|8|1906|3|31
death_place = Tokyo, Japan
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fields = Theoretical physics
workplaces = Institute for Advanced Study
Tokyo University of Education
alma_mater = Kyoto Imperial University
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notable_students =
known_for = Quantum electrodynamics
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awards = Nobel Prize in Physics (1965)
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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 Physics in 1965 along with Richard Feynman and Julian Schwinger.

Biography

Tomonoga was born in Tokyo in 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 Prize winner, was one of his classmates during undergraduate school. 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, meson theory, and his "super-many-time" theory. In 1948, he and his students re-examined a 1939 paper by Sidney Dancoff that 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 Pauli and 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 renormalization method independently of Julian Schwinger and calculated physical quantities such as the Lamb shift at the same time.

In the next year, he was invited by Robert Oppenheimer to work at the Institute for Advanced Study in Princeton Township. He studied a many-body problem on 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 Schwinger and Richard P. Feynman, for the study of QED, specifically for the discovery of the renormalization method. He died in Tokyo in 1979. 

References

*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]

External links

* [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.]


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  • Sin-itiro tomonaga — ou : Shinichirō Tomonaga (朝永 振一郎 Tomonaga Shin ichirō) est un physicien théoricien japonais (31 mars 1906 08 juillet 1979), prix Nobel 1965. Biographie Né à Kyoto, il est le fils aîné d un professeur de philosophie. Principales publications… …   Wikipédia en Français

  • Sin-Itiro Tomonaga — (朝永 振一郎) Sin Itiro Tomonaga en 1965 Naissance 31 mars 1906 Tōkyō (Empire du Japon) Décès 8 juillet 1979 …   Wikipédia en Français

  • Sin-Itiro Tomonaga — Shin’ichirō Tomonaga (jap. 朝永 振一郎 Tomonaga Shin’ichirō; * 31. März 1906 in Tokio; † 8. Juli 1979 ebendort) war ein japanischer Physiker. Er erhielt 1965 zusammen mit Richard P. Feynman und J. Schwinger den Physik Nobelpreis „für ihre fundamentale …   Deutsch Wikipedia

  • Tomonaga , Sin-Itiro — (1906–1979) Japanese theoretical physicist Tomonaga, who was born at Tokyo in Japan, graduated from Kyoto University in 1929 and then went to work in his native city. He remained there for the rest of his academic career, becoming professor of… …   Scientists

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  • Tomonaga Shin'ichirō — ▪ Japanese physicist Shin ichirō also spelled  Sin itiro  born March 31, 1906, Kyōto, Japan died July 8, 1979, Tokyo  Japanese physicist, joint winner, with Richard P. Feynman (Feynman, Richard P.) and Julian S. Schwinger (Schwinger, Julian… …   Universalium

  • Shinichirou Tomonaga — Sin Itiro Tomonaga Sin Itiro Tomonaga ou : Shinichirō Tomonaga (朝永 振一郎 Tomonaga Shin ichirō) est un physicien théoricien japonais (31 mars 1906 08 juillet 1979), prix Nobel 1965. Biographie Né à Kyoto, il est le fils aîné d un professeur de… …   Wikipédia en Français

  • Shin'ichirō Tomonaga — Tomonaga en 1965 Nacimiento 31 de mar …   Wikipedia Español

  • Richard Feynman — Richard Phillips Feynman Richard Feynman lors d une visite au Fermilab Naissance 11 mai 1918 Queens (New York) (États Unis) Décès …   Wikipédia en Français


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