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Article
Subquotients of Hecke C*-algebras
Ergodic Theory and Dynamical Systems
  • Nathan Brownlowe, University of Wollongong
  • Nadia S Larsen, University of Copenhagen
  • Ian F Putnam, University of Victoria
  • Iain Raeburn, University of Newcastle
Document Type
Journal Article
Publication Date
1-1-2005
Abstract
We realize the Hecke C∗-algebra CQ of Bost and Connes as a direct limit of Hecke C∗-algebras which are semigroup crossed products by NF, for F a finite set of primes. For each approximating Hecke C∗-algebra we describe a composition series of ideals. In all cases there is a large type I ideal and a commutative quotient, and the intermediate subquotients are direct sums of simple C∗-algebras. We can describe the simple summands as ordinary crossed products by actions of ZS for S a finite set of primes. When |S| = 1, these actions are odometers and the crossed products are Bunce–Deddens algebras; when |S| > 1, the actions are an apparently new class of higher-rank odometer actions, and the crossed products are an apparently new class of classifiable AT-algebras.
RIS ID
18845
Citation Information
Nathan Brownlowe, Nadia S Larsen, Ian F Putnam and Iain Raeburn. "Subquotients of Hecke C*-algebras" Ergodic Theory and Dynamical Systems Vol. 25 Iss. 5 (2005) p. 1503 - 1520
Available at: http://works.bepress.com/nbrownlowe/1/