A New Boson Realization of the Two-Level Pairing Model in a Many-Fermion System and Its Classical Counterpart : The Role of the su (2) ⊗ su (1, 1)-Coherent State in the Schwinger Boson Representation for the su (2) ⊗ su (2)-Algebra(Nuclear P

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概要

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• A new method for describing the two-level pairing model in a many-fermion system is presented. The basic idea comes from the Schwinger boson representation for the su (2) ⊗ su (2)-algebra, in which four kinds of boson operators govern the dynamics. It is well known that in the original fermion space, it is almost impossible to introduce any trial state for the variation except the BCS state in the framework of the mean field approximation. However, in the Schwinger boson representation, various trial states can be defined on the condition that the mean field approximation is useful. In these states, the su (2) ⊗ su (1, 1)-coherent state is mainly discussed in this paper.

• 2006-04-25

著者

• TSUE Yasuhiko

  Physics Division, Faculty of Science, Kochi University

• PROVIDENCIA Joao

  Departmento de Fisica, Universidade de Coimbra

• PROVIDENCIA Constanca

  Departmento de Fisica, Universidade de Coimbra

• YAMAMURA Masatoshi

  Department of Pure and Applied Physics, Faculty of Engineering Science, Kansai University

• Providencia Joao

  Departmento De Fisica Universidade De Coimbra

• Providencia Joao

  Departamento De Fisica Universidade De Coimbra

• Providencia C

  Departmento De Fisica Universidade De Coimbra

• Constanca Providencia

  Departamento De Fisica Universidade De Coimbra

• Providencia Constanca

  Departamento De Fisica Universidade De Coimbra

• YAMAMURA Masatoshi

  Faculty of Engineering, Kansai University

• Yamamura Masatoshi

  Department Of Pure And Applied Physics Faculty Of Engineering Science Kansai University

• Tsue Y

  Physics Division Faculty Of Science Kochi University

• Tsue Yasuhiko

  Physics Division Faculty Of Science Kochi University

• Providencia C

  Univ. Coimbra Coimbra Prt

• Yamamura Masatoshi

  Faculty Of Engineering Kansai University

• PROVIDENCIA Constanca

  Dpartamento de Fisica, Universidade de Coimbra

• PROVIDENCIA Constancia

  Departmento de Fisica, Universidade de Coimbra

• Da Providencia

  Departamento De Fisica Centro De Fisica Computacional Faculdade De Ciencias E Tecnologia Universidade De Coimbra

• YAMAMURA Masatoshi

  Depertment of Physics, Kyoto University

• YAMAMURA Masatoshi

  Department of Physics, Kyoto University : Faculty of Engineering, Kansai University

• YAMAMURA Masatoshi

  Faculty of Engineering ,Kansai University

• TSUE Yasuhiko

  Department of Physics, Kyoto University

• PROVIDENCIA Constanca

  Departament de Fisica, Universidade de Coimbra

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