Duality of compact groups and Hilbert C*-systems for C*-algebras with a nontrivial center

Details Duality of compact groups and Hilbert C*-systems for C*-algebras with a nontrivial center Duality of compact groups and Hilbert C*-systems for C*-algebras with a nontrivial center

2003-11-11

arxiv.org/abs/math/0311170v3

Int.J.Math. 15 (2004) 759-812

Mathematics

Operator Algebras

Final version appeared in Int. J. Math. 15 (2004) 759-812. Minor changes w.r.t. to the previous version

Scientific paper

In the present paper we prove a duality theory for compact groups in the case when the C*-algebra A, the fixed point algebra of the corresponding Hilbert C*-system (F,G), has a nontrivial center Z and the relative commutant satisfies the minimality condition A.'\cap F = Z as well as a technical condition called regularity. The abstract characterization of the mentioned Hilbert C*-system is expressed by means of an inclusion of C*-categories T_\c < T, where T_\c{i}s a suitable DR-category and T a full subcategory of the category of endomorphisms of A. Both categories have the same objects and the arrows of T can be generated from the arrows of T_\c{a}nd the center Z. A crucial new element that appears in the present analysis is an abelian group C(G), which we call the chain group of G, and that can be constructed from certain equivalence relation defined on G^, the dual object of G. The chain group, which is isomorphic to the character group of the center of G, determines the action of irreducible endomorphisms of A when restricted to Z. Moreover, C(G) encodes the possibility of defining a symmetry $\epsilon$ also for the larger category T of the previous inclusion.

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