Ey. Leung, ON RESOLVING THE MULTIPLICITY OF THE BRANCHING RULE GL(2K, C)DOWN-ARROW-SP(2K, C), Journal of physics. A, mathematical and general, 27(8), 1994, pp. 2749-2760
We consider the multiplicity problem of the branching rule GL(2k, C) d
own Sp(2k, C). Finite-dimensional irreducible representations of GL(2k
, C) are realized as right translations on subspaces of the holomorphi
c Hilbert (Bargmann) spaces of q x 2k complex variables. Maps are exhi
bited which carry an irreducible representation of Sp(2k, C) into thes
e subspaces. An algebra of commuting operators is constructed and it i
s shown how eigen-values of certain of these operators can be used to
resolve the multiplicity.