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Featured researches published by Ziro Koba.


Progress of Theoretical Physics | 1955

Variation Principle in Relativistic Hydrodynamics

Ziro Koba

Recently Halatnikovll* has given a variation principle to derive the equations of the relativistic hydrodynamics. His procedure is based on the analogy to the relativistic particle dynamics. In this note it will be shown that an alternative variation method, which closely resembles that of field dynamics, can describe the behaviour of an ideal compressible fluid if one restricts oneself to the two limiting cases of extremely high and of extremely low temperatures. The law of energy-momentum conservation for the compressible fluid is expressed by2)


Progress of Theoretical Physics Supplement | 1958

Hypothetical Velocity Measurements of a Dirac Particle

Ziro Koba

The characteristic behavior of a wave packet of a Dirac particle immediately after a precise position measurement, which is essentially due to the presence of inner degrees of freedom or the commutativity of the position and the velocity operators, is reinvestigated and compared with that of a fictitious one- component relativistic particle that is assumed to have only positive energy states. In order to distinguish this particle from a Dirac particle another hypothetical experiment of three successive position measurements is presented. Further, the procedure of this velocity measurement is analyzed by a three- dimensional treatment, which reveals the polarity of the Dirac electron and illustrates the non-commutativity of different components of the velocity. Finally the possibility of constructing sn arbitrarily small wave packet of a Dirac particle with positive energy states only, and the possibility of applying the present analysis to bosons are discussed.


Progress of Theoretical Physics | 1958

Antinucleon Annihilation and Multiplicity of Emitted Pions

Ziro Koba

The large cross section and the high multiplicity of emitted pions are the most conspicuous features of nucleon-antinucleon annihilation experiments. A semiquantitative relation between these two facts is discussed. (A.C.)


Progress of Theoretical Physics | 1958

Antinucleon-Nucleon Interactions

Ziro Koba; Gyo Takeda


Protein Science | 1959

Theory of Multiple Particle Production at Extremely High Energy

Ziro Koba; Shuji Takagi


Progress of Theoretical Physics | 1956

Remarks on the Pion-Pion Interaction

Ziro Koba


Protein Science | 1963

Recent Theoretical Considerations on Ultra High Energy Nuclear Collisions

Ziro Koba


Progress of Theoretical Physics | 1957

NOTE ON MODELS OF MULTIPLE MESON PRODUCTION AT EXTREMELY HIGH ENERGY

Ziro Koba


Progress of Theoretical Physics | 1950

Radiation Reaction in Collision Process, II

Ziro Koba; Gyo Takeda


Protein Science | 1963

On Application of the Regge Pole Hypothesis to Highly Inelastic Processes

Ziro Koba

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