arXiv math-ph/03010072003-01math-phmath.MPmath.SG

Some considerations on topologies of infinite dimensional unitary coadjoint orbits

Pavel Bona

备注：: 13 pages; corrected a serious error in formulation and proof of Proposition 3.1; the main results and their proofs were by this untouched
发表信息：: Journal of Geometry and Physics 51 (2004) 256-268
DOI：: 10.1016/j.geomphys.2003.10.010

英文摘要：

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.

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