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LIOUVILLE EQUATION OF RELATIVISTIC CHARGED FERMION

KO CHE-MING WONG CHEUK-YIN ZHU DONG-PEI WANG REN-CHUAN

LIOUVILLE EQUATION OF RELATIVISTIC CHARGED FERMION

KO CHE-MING, WONG CHEUK-YIN, ZHU DONG-PEI, WANG REN-CHUAN
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  • Received Date:  15 January 1990
  • Published Online:  28 June 2005

LIOUVILLE EQUATION OF RELATIVISTIC CHARGED FERMION

  • 1. (1)美国德州A&M大学物理系回旋加速器研究所与理论物理中心; (2)美国橡树岭国家实验室; (3)中国科学技术大学近代物理系; (4)中国科学技术大学天体物理中心,合肥,230026

Abstract: As a form of density matrix, the Wigner function is the distribution in quantum phase space. It is a 2×2 matrix function when one uses it to describe the non-relativistic fermion. While describing the relativistic fermion, it is usually represented by 4×4 matrix function. In this paper we obtain a Wigner function for the relativistic fermion in the form of 2×2 matrix, and the Liouville equation satisfied by the Wigner function. This equation is equivalent to the Dirac equation of charged fermion in QED. Our equation is also equivalent to the Dirac equation in the Walecka model applied to the intermediate energy nuclear collision while the nucleon is coupled to the vector meson only (or taking mean field approximation for the scalar meson). We prove that our 2×2 Wigner function completely describes the quantum system just the same as the relativistic fermion wave function. All the information about the observables can be obtained with our Wigner function.

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