Periodic 2-graphs arising from subshifts

Details Periodic 2-graphs arising from subshifts Periodic 2-graphs arising from subshifts

2009-11-04

arxiv.org/abs/0911.0730v1

Mathematics

Operator Algebras

17 pages

Scientific paper

Higher-rank graphs were introduced by Kumjian and Pask to provide models for higher-rank Cuntz-Krieger algebras. In a previous paper, we constructed 2-graphs whose path spaces are rank-two subshifts of finite type, and showed that this construction yields aperiodic 2-graphs whose $C^*$-algebras are simple and are not ordinary graph algebras. Here we show that the construction also gives a family of periodic 2-graphs which we call \emph{domino graphs}. We investigate the combinatorial structure of domino graphs, finding interesting points of contact with the existing combinatorial literature, and prove a structure theorem for the $C^*$-algebras of domino graphs.

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