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Shift–tail equivalence and an unbounded representative of the Cuntz–Pimsner extension

Published online by Cambridge University Press:  08 November 2016

Department of Mathematical Sciences, Chalmers University of Technology and the University of Gothenburg, SE-412 96 Gothenburg, Sweden
Institut für Analysis, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
School of Mathematics and Applied Statistics, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia


We show how the fine structure in shift–tail equivalence, appearing in the non-commutative geometry of Cuntz–Krieger algebras developed by the first two listed authors, has an analogue in a wide range of other Cuntz–Pimsner algebras. To illustrate this structure, and where it appears, we produce an unbounded representative of the defining extension of the Cuntz–Pimsner algebra constructed from a finitely generated projective bi-Hilbertian module, extending work by the third listed author with Robertson and Sims. As an application, our construction yields new spectral triples for Cuntz and Cuntz–Krieger algebras and for Cuntz–Pimsner algebras associated to vector bundles twisted by an equicontinuous $\ast$-automorphism.

Original Article
© Cambridge University Press, 2016 

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