Holomorphic geometric models for representations of $C^*$-algebras

Details Holomorphic geometric models for representations of $C^*$-algebras Holomorphic geometric models for representations of $C^*$-algebras

2007-07-05

arxiv.org/abs/0707.0806v2

Mathematics

Operator Algebras

45 pages

Scientific paper

Representations of $C^*$-algebras are realized on section spaces of holomorphic homogeneous vector bundles. The corresponding section spaces are investigated by means of a new notion of reproducing kernel, suitable for dealing with involutive diffeomorphisms defined on the base spaces of the bundles. Applications of this technique to dilation theory of completely positive maps are explored and the critical role of complexified homogeneous spaces in connection with the Stinespring dilations is pointed out. The general results are further illustrated by a discussion of several specific topics, including similarity orbits of representations of amenable Banach algebras, similarity orbits of conditional expectations, geometric models of representations of Cuntz algebras, the relationship to endomorphisms of ${\mathcal B}({\mathcal H})$, and non-commutative stochastic analysis.

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