Strictly convex ergodic billiards

Authors: Wentao Fan, Boris Hasselblatt

License: CC BY 4.0

Abstract: We produce the first known strictly convex ergodic billiards: sufficiently asymmetric lemon billiards. These billiard tables are the intersection of two circles of which one contains the centers of both. We previously proved that they have \emph{uniformly} hyperbolic returns to a suitable section, and we here control singularity curves, with an approach that seems new. This implies ergodicity and indeed the Bernoulli property.

Submitted to arXiv on 20 Oct. 2026

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