Projection onto physical boson states in a collective subspace

Dobaczewski J. ; Geyer H.B. ; Hahne F.J.W. (1991)

Article

A projection operator in a collective boson space, which projects onto the physical subspace, is constructed. This makes it possible to identify spurious boson eigenstates by a simple prescription which does not refer to noncollective boson operators at any stage. © 1991 The American Physical Society.

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