“…The quantization of the bosonic variables z, h, η 1 , κ 1 , and η, κ is done with the new restframe quantization scheme for relativistic quantum mechanics introduced in Ref. [16] 1 in an un-physical Hilbert space H = H com ⊗H η 1 ⊗H η , where H com is the Hilbert space of the frozen Jacobi data of the external decoupled center of mass. The physical states and the associated physical Hilbert space have to be identified by solving the restrictions < Φ phys |ˆ P (int) |Φ phys > = < Φ phys |ˆ K (int) |Φ phys > = 0 (quantization of the rest-frame conditions (3.19) eliminating the internal center of mass inside the Wigner 3-space).…”