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- W2075683634 abstract "We show that the open unit ball of the space of operators from a finite-dimensional Hilbert space into a separable Hilbert space (we call it “operator ball”) has a restricted form of normal structure if we endow it with a hyperbolic metric (which is an analogue of the standard hyperbolic metric on the unit disc in the complex plane). We use this result to get a fixed point theorem for groups of biholomorphic automorphisms of the operator ball. The fixed point theorem is used to show that a bounded representation in a separable Hilbert space which has an invariant indefinite quadratic form with finitely many negative squares is unitarizable (equivalent to a unitary representation). We apply this result to find dual pairs of invariant subspaces in Pontryagin spaces. In Appendix A we present results of Itai Shafrir about hyperbolic metrics on the operator ball." @default.
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- W2075683634 date "2009-10-01" @default.
- W2075683634 modified "2023-10-18" @default.
- W2075683634 title "Unitarizable representations and fixed points of groups of biholomorphic transformations of operator balls" @default.
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- W2075683634 doi "https://doi.org/10.1016/j.jfa.2009.06.021" @default.
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