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Decay of Correlations and Invariance Principles for Dispersing Billiards with Cusps, and Related Planar Billiard Flows

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Abstract

Following recent work of Chernov, Markarian, and Zhang, it is known that the billiard map for dispersing billiards with zero angle cusps has slow decay of correlations with rate 1/n. Since the collisions inside a cusp occur in quick succession, it is reasonable to expect a much faster decay rate in continuous time. In this paper we prove that the flow is rapid mixing: correlations decay faster than any polynomial rate. A consequence is that the flow admits strong statistical properties such as the almost sure invariance principle, even though the billiard map does not.

The techniques in this paper yield new results for other standard examples in planar billiards, including Bunimovich flowers and stadia.

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Authors and Affiliations

  1. Institute of Mathematics, Budapest University of Technology and Economics, Budapest, Hungary

    Péter Bálint

  2. Department of Mathematics, University of Surrey, Guildford, GU2 7XH, UK

    Ian Melbourne

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  1. Péter Bálint
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  2. Ian Melbourne
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Correspondence to Péter Bálint.

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Bálint, P., Melbourne, I. Decay of Correlations and Invariance Principles for Dispersing Billiards with Cusps, and Related Planar Billiard Flows. J Stat Phys 133, 435–447 (2008). https://doi.org/10.1007/s10955-008-9623-y

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  • DOI: https://doi.org/10.1007/s10955-008-9623-y

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