Ryogo Kubo

Ryogo Kubo (Japanese久保 亮 五, Kubo Ryogo; * February 15, 1920 in the prefecture of Tokyo, † March 31, 1995 in Japan) was a Japanese physicist who worked on statistical mechanics and theoretical solid state physics.

Life and work

Kubo studied physics at the Tokyo Imperial University, where he was awarded a degree in 1941 and was from 1954 professor. He gained an early reputation one of the best students who had ever studied at the University of Tokyo. He had a doctorate in polymer physics and engaged in the early 1950s with Kazuhiza Tomita with relaxation phenomena in nuclear magnetic resonance ( NMR). This resulted in its linear response theory (irreversible ) systems close to the thermodynamic equilibrium, of the so-called Kubo formalism. Is the coefficient of the linear transport problem term autocorrelation functions are accommodated in the case of equilibrium in connection ( Kubo green ratios ) in the case of the NMR spin-spin susceptibility, and auto-correlation functions. Kubo showed in its linear response theory and the general fluctuation-dissipation theorem.

According to him, PC Martin and Julian Schwinger KMS conditions are called boundary conditions for Green's functions (with analytic continuation to imaginary time, which is identified as the inverse temperature) in the quantum statistics for states in thermal equilibrium. It has been extended to the ( relativistic ) quantum field theory where it is used for the characterization of states in thermal equilibrium and has a counterpart in the theory of operator algebras ( Tomita - Takesaki theory ), with further applications in statistical mechanics and axiomatic quantum field theory.

Until 1981 he was a professor at the University of Tokyo, then Kyoto. Since 1985 he was a professor at Keio University in Yokohama. 1981 he was Lorentz Professor Gast at Leiden University.

In 1977, he received the Boltzmann Medal. 1964/65 he was president of the Japanese Physical Society. Him each year to the " Kubo - Ryogo Memorial Award " is awarded to physicists at the age to 45 years since 1997 in honor.

Writings

  • Statistical mechanical theory of irreversible processes 1,2, J. Phys. Soc. Bd.12 Japan, 1957, pp. 570, 1203 ( part 2 with M. Yokota, S. Nakajima )
  • Some aspects of the statistical mechanical theory of irreversible processes, in Brittin, Dunham (Editor) Lectures on theoretical physics, Interscience 1959
  • Linear response theory of irreversible processes, in Statistical Mechanics of Equilibrium and non equilibrium, North Holland, 1965 ( Proc.Symp. Aachen 1964)
  • Hiroshi Ichimura only, Tsunemaru Usui, Natsuki Hashitsume Statistical mechanics: an advanced course with problems and solutions, North Holland 1965, 7th Edition 1988
  • With Ichimura, Usui, Hashitsume Thermodynamics: an advanced course with problems and solutions, North Holland 1968
  • Selected papers of professor Ryogo Kubo on the occasion of his sixtieth birthday, Syokabo, Tokyo 1980
  • With Morikazu Toda, Nobuhiko Saito Statistical physics, 1983, 1985 Equilibrium statistical mechanics in 1983, 2nd edition 1992 ( with Toda, Saito ), Springer
  • Nonequilibrium statistical mechanics ( with Toda, Hashitsume ), 1985, 2nd edition, 1991, Springer
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