Weak mixing directions in non-arithmetic Veech surfaces

Avila, Artur; Delecroix, Vincent

doi:10.1090/jams/856

Weak mixing directions in non-arithmetic Veech surfaces
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by Artur Avila and Vincent Delecroix;

J. Amer. Math. Soc. 29 (2016), 1167-1208

DOI: https://doi.org/10.1090/jams/856

Published electronically: January 13, 2016

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Abstract:

We show that the billiard in a regular polygon is weak mixing in almost every invariant surface, except in the trivial cases which give rise to lattices in the plane (triangle, square, and hexagon). More generally, we study the problem of prevalence of weak mixing for the directional flow in an arbitrary non-arithmetic Veech surface and show that the Hausdorff dimension of the set of non-weak mixing directions is not full. We also provide a necessary condition, verified, for instance, by the Veech surface corresponding to the billiard in the pentagon, for the set of non-weak mixing directions to have a positive Hausdorff dimension.

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