Classical and Quantal Descriptions of Small Amplitude Fluctuations around Equilibriums in the Two-Level Pairing Model(Nuclear Physics)

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概要

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• Various classical counterparts to the two-level pairing model in a many-fermion system are presented in the Schwinger boson representation. It is shown that one of the key ingredients giving the classical descriptions for quantal systems is the use of various trial states in addition to the su(2) [○!×] su(2)-coherent state, which may be a natural selection for the two-level pairing model governed by the su(2) [○!×] su(2)-algebra. It is pointed out that a spurious behavior such as a sharp phase transition can be avoided by using the other states including the su(2) [○!×] su(1, 1)- and su(1, 1) [○!×] su(1, 1)-coherent states. This contrasts with the situation regarding the usual Hartree-Fock-Bogoliubov and quasi-particle random phase approximations applied to the original fermion system, which yield a sharp phase transition.

• 2007-05-25

著者

• TSUE Yasuhiko

  Physics Division, Faculty of Science, Kochi University

• PROVIDENCIA Constanca

  Departmento de Fisica, Universidade de Coimbra

• YAMAMURA Masatoshi

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

• Da Providencia

  Universidade De Coimbra Coimbra Prt

• 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

• da PROVIDENCIA

  Departamento de Fisica, Universidade de Coimbra

• 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 Joao

  Dpartamento de Fisica, Universidade de Coimbra

• Da Providencia

  Departamento De Fisica Universidade De Coimbra

• TSUE Yasuhiro

  Department of Physics, Kochi University

• 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

• PROVIDENCIA Joao

  Department of Fisica, Universidade de Coimbra

• PROVIDENCIA Joao

  Departamento de Fisica,Universidade de Coimbra

• PROVIDENCIA Joao

  Departamento de Fisica, Unversidade de Coimbra

• PROVIDENCIA Joao

  Departament de Fisica, Universidade de Coimbra

• TSUE Yasuhiko

  Departamento de Fisica,Universidade de Coimbra

• TSUE Yasuhiko

  Department of Physics, Kyoto University

• PROVIDENCIA Constanca

  Departament de Fisica, Universidade de Coimbra

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