Importance of single boson and single fermion mappings in the thermal boson expansion
May, 2001
7 pages
Published in:
- Phys.Rev.C 64 (2001) 015201
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Abstract: (APS)
In the context of the boson expansion theory, it is usually the case that the bosonization of single-boson (fermion) states is ignored. Although this is tolerable to some extent in cold systems, it causes serious difficulties in the treatment of thermal ensembles where the single-boson (fermion) density of states plays an important role. In the framework of the thermo-field dynamics it is shown how extended forms of the Holstein-Primakoff mapping for both bosons and fermions can lead to consistent thermal-boson expansions. Applications to the O(N) anharmonic oscillator and the Lipkin model are presented.References(16)
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