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The ideal structure of some analytic crossed products
Authors:Miron Shpigel
Affiliation:Department of Mathematics, Technion --- Israel Institute of Technology, 3200 Haifa, Israel
Abstract:We study the ideal structure of a class of some analytic crossed products. For an $r$-discrete, principal, minimal groupoid $G$, we consider the analytic crossed product $C^*(G,sigma)times _alpha mathbb{Z}_+$, where $alpha$ is given by a cocycle $c$. We show that the maximal ideal space $mathcal{M}$ of $C^*(G,sigma)times _alpha mathbb{Z}_+$ depends on the asymptotic range of $c$, $R_infty(c)$; that is, $mathcal{M}$ is homeomorphic to $overline{mathbb{D}}mid R_infty(c)$ for $R_infty(c)$ finite, and $cal M$ consists of the unique maximal ideal for $R_infty(c)=mathbb{T}$. We also prove that $C^*(G,sigma)times _alpha mathbb{Z}_+$ is semisimple in both cases, and that $R_infty(c)$ is invariant under isometric isomorphism.

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