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4 papers · 2 filters
Classical and Quantal Descriptions of Small Amplitude Fluctuations Around Equilibriums in the Two-Level Pairing Model
Y. Tsue, C. Providencia, J. da Providencia +1
Various classical counterparts for 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 ingredi…
The Lipkin Model in Many-Fermion System as an Example of the su(1,1) times su(1,1)-Algebraic Model
C. Providencia, J. da Providencia, Y. Tsue +1
Following the idea, recently, proposed by the present authors for the two-level pairing model, the Lipkin model is reexamined. It is a natural generalization of the method already…
A Note on the Two-Level Pairing Model Obeying the su(2)*su(2)-Algebra
C. Providencia, J. da Providencia, Y. Tsue +1
The two-level pairing model obeying the su(2)*su(2)-algebra, which was discussed in the previous paper, is re-formed in the framework of the su(1,1)*su(1,1)-algebra in the Schwinge…
A New Boson Realization of Two-Level Pairing Model in Many-Fermion System and its Classical Counterpart
C. Providencia, J. da Providencia, Y. Tsue +1
A new method for describing the two-level pairing model in a many-fermion system is presented. Basic idea comes from the Schwinger boson representation for the su(2) cross su(2)-al…