Decay of correlations and invariance principles for dispersing billiards with cusps, and related planar billiard flows

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.

14 pages

References in corpus (4)

• Almost Sure Invariance Principle For Nonuniformly Hyperbolic Systems
• Billiards with polynomial mixing rates
• Limit theorems in the stadium billiard
• Decay of correlations for slowly mixing flows

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• Linear and nonlinear stability of periodic orbits in annular billiards
• Polynomial decay of correlations in the generalized baker's transformation