Minimal Cuntz-Krieger Dilations and Representations of Cuntz-Krieger Algebras

Details Minimal Cuntz-Krieger Dilations and Representations of Cuntz-Krieger Algebras Minimal Cuntz-Krieger Dilations and Representations of Cuntz-Krieger Algebras

2005-05-24

arxiv.org/abs/math/0505499v1

Mathematics

Operator Algebras

29 pages

Scientific paper

Given a contractive tuple of Hilbert space operators satisfying certain $A$-relations we show that there exists a unique minimal dilation to generators of Cuntz-Krieger algebras or its extension by compact operators. This Cuntz-Krieger dilation can be obtained from the classical minimal isometric dilation as a certain maximal $A$-relation piece. We define a maximal piece more generally for a finite set of polynomials in $n$ noncommuting variables. We classify all representations of Cuntz-Krieger algebras ${\mathcal O}_A$ obtained from dilations of commuting tuples satisfying $A$-relations. The universal properties of the minimal Cuntz-Krieger dilation and the WOT-closed algebra generated by it is studied in terms of invariant subspaces.

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