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[en] A simple boson system with an SO(2) symmetry is considered. An intrinsic subspace containing the intrinsic excitations of the system is identified by means of an eigenstate of the position operators. This makes it possible to calculate excitational energies and moments of inertia while the symmetry is treated exactly. The group theoretical considerations underlying this approximation are discussed in detail. This is constrasted with the random phase approximation which is also cast in a group theoretical framework
Source
Organization of Theoretical Physicists, Pretoria (South Africa); South African Inst. of Physics, Faure; 274 p; ISBN 0 86960 831 2; 
; 1986; p. 213-246; 21. Annual seminar on theoretical physics; Johannesburg (South Africa); 8-11 Jul 1986
; 1986; p. 213-246; 21. Annual seminar on theoretical physics; Johannesburg (South Africa); 8-11 Jul 1986