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A note on crossed products of rotation algebras (1905.12279v1)
Published 29 May 2019 in math.OA
Abstract: We compute the $K$-theory of crossed products of rotation algebras $\mathcal{A}\theta$, for any real angle $\theta$, by matrices in $\mathrm{SL}(2,\mathbb{Z})$ with infinite order. Using techniques of continuous fields, we show that the canonical inclusion of $\mathcal{A}\theta$ into the crossed products is injective at the level of $K_0$-groups. We then give an explicit set of generators for the $K_0$-groups and compute the tracial ranges concretely.