Entropy of shifts on higher-rank graph C*-algebras

Details Entropy of shifts on higher-rank graph C*-algebras Entropy of shifts on higher-rank graph C*-algebras

2006-05-09

arxiv.org/abs/math/0605228v2

Houston Journal of Mathematics 34, No.1 (2008), 269-282

Mathematics

Operator Algebras

11 pages, revised and corrected version

Scientific paper

Let O_{Lambda} be a higher rank graph C*-algebra of rank r. For every tuple p of non-negative integers there is a canonical completely positive map Phi^p on O_{Lambda} and a subshift T^p on the path space X of the graph. We show that ht(Phi^p)=h(T^p), where ht is Voiculescu's approximation entropy and h the classical topological entropy. For a higher rank Cuntz-Krieger algebra O_M we obtain ht(Phi^p)= log r(M_1^{p_1}M_2^{p_2} ... M_r^{p_r}), r being the spectral radius. This generalises Boca and Goldstein's result for Cuntz-Krieger algebras.

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