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Purely infinite $C^{\ast }$-algebras associated to étale groupoids

Published online by Cambridge University Press:  04 August 2014

JONATHAN BROWN ,
LISA ORLOFF CLARK  and
ADAM SIERAKOWSKI
JONATHAN BROWN
Affiliation:
Department of Mathematics, University of Dayton, 300 College Park, Dayton, OH 45469-2316, USA email [email protected]
LISA ORLOFF CLARK
Affiliation:
Department of Mathematics and Statistics, University of Otago, PO Box 56, Dunedin 9054, New Zealand email [email protected]
ADAM SIERAKOWSKI
Affiliation:
School of Mathematics and Applied Statistics, University of Wollongong, NSW 2522, Australia email [email protected]
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Abstract

Let $G$ be a Hausdorff, étale groupoid that is minimal and topologically principal. We show that $C_{r}^{\ast }(G)$ is purely infinite simple if and only if all the non-zero positive elements of $C_{0}(G^{(0)})$ are infinite in $C_{r}^{\ast }(G)$. If $G$ is a Hausdorff, ample groupoid, then we show that $C_{r}^{\ast }(G)$ is purely infinite simple if and only if every non-zero projection in $C_{0}(G^{(0)})$ is infinite in $C_{r}^{\ast }(G)$. We then show how this result applies to $k$-graph $C^{\ast }$-algebras. Finally, we investigate strongly purely infinite groupoid $C^{\ast }$-algebras.

Type
Research Article
Information
Ergodic Theory and Dynamical Systems , Volume 35 , Issue 8 , December 2015 , pp. 2397 - 2411
Copyright
© Cambridge University Press, 2014 

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