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On the $K$-theory of $C^{\ast }$-algebras arising from integral dynamics

Published online by Cambridge University Press:  22 September 2016

SELÇUK BARLAK ,
TRON OMLAND  and
NICOLAI STAMMEIER
SELÇUK BARLAK
Affiliation:
Department of Mathematics and Computer Science, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark email [email protected]
TRON OMLAND
Affiliation:
Department of Mathematics, University of Oslo, P.O. Box 1053 Blindern, NO-0316 Oslo, Norway email [email protected], [email protected]
NICOLAI STAMMEIER
Affiliation:
Department of Mathematics, University of Oslo, P.O. Box 1053 Blindern, NO-0316 Oslo, Norway email [email protected], [email protected]
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Abstract

We investigate the $K$-theory of unital UCT Kirchberg algebras ${\mathcal{Q}}_{S}$ arising from families $S$ of relatively prime numbers. It is shown that $K_{\ast }({\mathcal{Q}}_{S})$ is the direct sum of a free abelian group and a torsion group, each of which is realized by another distinct $C^{\ast }$-algebra naturally associated to $S$. The $C^{\ast }$-algebra representing the torsion part is identified with a natural subalgebra ${\mathcal{A}}_{S}$ of ${\mathcal{Q}}_{S}$. For the $K$-theory of ${\mathcal{Q}}_{S}$, the cardinality of $S$ determines the free part and is also relevant for the torsion part, for which the greatest common divisor $g_{S}$ of $\{p-1:p\in S\}$ plays a central role as well. In the case where $|S|\leq 2$ or $g_{S}=1$ we obtain a complete classification for ${\mathcal{Q}}_{S}$. Our results support the conjecture that ${\mathcal{A}}_{S}$ coincides with $\otimes _{p\in S}{\mathcal{O}}_{p}$. This would lead to a complete classification of ${\mathcal{Q}}_{S}$, and is related to a conjecture about $k$-graphs.

Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 38 , Issue 3 , May 2018 , pp. 832 - 862
Copyright
© Cambridge University Press, 2016 

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