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Continuous-trace groupoid -algebras. III
Authors:Paul S Muhly  Jean N Renault  Dana P Williams
Institution:Department of Mathematics, University of Iowa Iowa City, Iowa 52242 ; Department of Mathematics, University of Iowa Iowa City, Iowa 52242 - Département de Mathématiques, Université d'Orléans, 45067 Orléans Cedex 2, France ; Department of Mathematics, Dartmouth College, Hanover, New Hampshire 03755-3551
Abstract:Suppose that ${\mathcal {G}}$ is a second countable locally compact groupoid with a Haar system and with abelian isotropy. We show that the groupoid $C^{\displaystyle *}$-algebra $C^{\displaystyle *} ({\mathcal {G}},\lambda )$ has continuous trace if and only if there is a Haar system for the isotropy groupoid ${\mathcal {A}}$ and the action of the quotient groupoid ${\mathcal {G}}/{\mathcal {A}}$ is proper on the unit space of ${\mathcal {G}}$.

Keywords:Locally compact groupoid  $C^{\displaystyle *}$-algebra  continuous trace
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