Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-01-30
Physics
Nuclear Physics
Nuclear Theory
22 pages, no figure, using PTP TeX class
Scientific paper
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)-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 mixed-mode coherent state is mainly discussed in this paper.
Providencia Constança
Providencia Joao da
Tsue Yasuhiko
Yamamura Masatoshi
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