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|Title: ||Duality of compact groups and Hilbert C*-systems for C*-algebras with a nontrivial center|
|Author(s): ||Lledó, Fernando|
|Publisher: ||World Scientific Publishing|
|Issued date: ||2004|
|Citation: ||International Journal of Mathematics (IJM), 2004, vol. 15, n. 8, p. 759-812|
|Description: ||54 pages, no figures.-- MSC2000 codes: 22D25, 46L08, 18D10, 47L25.-- Dedicated to Detlev Buchholz on his 60th birthday.|
MR#: MR2097019 (2006d:22008)
Zbl#: Zbl 1071.22002
|Abstract: ||In this paper we present 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 ⊃ C1 and the relative commutant satisfies the minimality condition A' ∩ 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 Tc < T, where Tc is 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 Tc and 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 ∊ also for the larger category T of the previous inclusion.
|Sponsor: ||We are grateful to the DFG-Graduiertenkolleg "Hierarchie und Symmetrie in mathematischen Modellen" for supporting two visits of H.B. to the RWTH-Aachen.|
|Publisher version: ||http://dx.doi.org/10.1142/S0129167X04002545|
|Keywords: ||Duality compact groups|
|Rights: ||© World Scientific Publishing|
|Appears in Collections:||DM - GAMA - Artículos de Revistas|
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