Some considerations on topologies of infinite dimensional unitary coadjoint orbits
arXiv:math-ph/0301007 · doi:10.1016/j.geomphys.2003.10.010
Abstract
The topology of the embedding of the coadjoint orbits of the unitary group U(H) of an in-finite dimensional complex Hilbert space H, as canonically determined subsets of the B-space T_s of symmetric trace class operators, is investigated. The space T_s is identified with the B-space predual of the Lie-algebra L(H)_s of the Lie group U(H). It is proved, that orbits con-sisting of symmetric operators with finite rank are (regularly embedded) closed submanifolds of T_s. An alternative method of proving this fact is given for the `one-dimensional' orbit, i.e. for the projective Hilbert space P(H). Also a technical assertion concerning existence of simply related decompositions into one-dimensional projections of two unitary equivalent (orthogonal) projections in their `generic mutual position' is formulated, proved, and illustrated.
13 pages; corrected a serious error in formulation and proof of Proposition 3.1; the main results and their proofs were by this untouched
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