On the question of ergodicity for minimal group actions on the circle

Details On the question of ergodicity for minimal group actions on the circle On the question of ergodicity for minimal group actions on the circle

2008-06-11

arxiv.org/abs/0806.1974v1

Mathematics

Dynamical Systems

41 pages, 7 figures; submitted to Moscow Mathematical Journal

Scientific paper

This work is devoted to the study of minimal, smooth actions of finitely generated groups on the circle. We provide a sufficient condition for such an action to be ergodic (with respect to the Lebesgue measure), and we illustrate this condition by studying two relevant examples. Under an analogous hypothesis, we also deal with the problem of the zero Lebesgue measure for exceptional minimal sets. This hypothesis leads to many other interesting conclusions, mainly concerning the stationary and conformal measures. Moreover, several questions are left open. The methods work as well for codimension-one foliations, though the results for this case are not explicitly stated.

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