Hiroshi Enatsu

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Hiroshi Enatsu
Born(1922-09-12)September 12, 1922
Miyakonojō, Japan
DiedAugust 4, 2019(2019-08-04) (aged 97)
Kyoto, Japan
Alma materKyoto University
Scientific career
FieldsTheoretical physics
  • Kyoto University
  • Columbia University
  • Niels Bohr Institute
  • Ritsumeikan University
Doctoral advisorHideki Yukawa
InfluencesNiels Bohr

Hiroshi Enatsu (12 September 1922 - 4 August 2019) was a Japanese theoretical physics who contributed to a special relativity Hamiltonian mechanics formalism in quantum field theory.

Academic works

Enatsu has found [1]that the Canonical commutation relation [2] <math>[\psi (x, \tau), \psi ^*(x', \tau)] = \delta ( x - x' )</math> in a relativistic Hamiltonian formalism is equivalent to that in the conventional non-relativistic Hamiltonian formalism of quantum field theory, where <math>[\psi, \phi] = \psi \phi - \phi \psi</math> is the commutator, <math> x </math> is spacetime coordinates, <math>\tau</math> is proper time, <math>\psi ^*</math> is Hermitian adjoint of <math>\psi</math>, and <math>\delta (x)</math> is the Dirac delta function, with the aid of the relation <math>\epsilon ( x - x' ) \epsilon ( \tau - \tau' )=1</math>.


  • 1922 born on September 12 in Miyakonojō as a son of Eizo and Fumi (Kuroiwa) Enatsu
  • 1944 received Bachelor of Science from Kyoto University
  • 1953 received Doctor of Science [3] from Kyoto University
  • 1946 - 1957 assistant at Kyoto University[4][5]
  • 1952 - 1953 research assistant at Columbia University [6] in New York City
  • 1955 - 1956 visiting member of the Institute for Theoretical Physics in Copenhagen[7][8]
  • 1957 assistant professor and inaugurated a professor at Ritsumeikan University in Kyoto
  • 1971 to 1972 the Dean of faculty of science and engineering at Ritsumeikan University
  • 1988 retired from a professor at Ritsumeikan University in Kyoto, and has been a professor emeritus
  • 2019 died on 4 August in Kyoto [9]

Research articles


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