Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-12-30
Found.Phys. 37 (2007) 40-79
Physics
High Energy Physics
High Energy Physics - Theory
37 pages
Scientific paper
10.1007/s10701-006-9094-4
The arguments by Pandres that the double valued spherical harmonics provide a basis for the irreducible spinor representation of the three dimensional rotation group are further developed and justified. The usual arguments against the inadmissibility of such functions, concerning hermiticity, orthogonality, behavior under rotations, etc., are all shown to be related to the unsuitable choice of functions representing the states with opposite projections of angular momentum. By a correct choice of functions and definition of inner product those difficulties do not occur. And yet the orbital angular momentum in the ordinary configuration space can have integer eigenvalues only, for the reason which have roots in the nature of quantum mechanics in such space. The situation is different in the velocity space of the rigid particle, whose action contains a term with the extrinsic curvature.
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