Rohlin properties for $Z^d$-actions on the Cantor set

Details Rohlin properties for $Z^d$-actions on the Cantor set Rohlin properties for $Z^d$-actions on the Cantor set

2009-01-23

arxiv.org/abs/0901.3604v2

Mathematics

Dynamical Systems

15 pages

Scientific paper

We study the space of continuous $Z^d$-actions on the Cantor set, particularly questions on the existence and nature of actions whose isomorphism class is dense (Rohlin's property). Kechris and Rosendal showed that for $d=1$ there is an action on the Cantor set whose isomorphism class is residual. We prove in contrast that for $\geq 2$ every isomorphism class is meager; on the other hand, while generically an action has dense isomorphism class and the effective actions are dense, no effective action has dense isomorphism class. Thus for $d \geq 2$ conjugation on the space of actions is topologically transitive but one cannot construct a transitive point. Finally, we show that in the space of transitive and minimal actions the effective actions are nowhere dense, and in particular there are minimal actions that are not approximable by minimal SFTs.

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