Abstract
Dispersing billiards with cusps are deterministic dynamical systems with a mild degree of chaos, exhibiting “intermittent” behavior that alternates between regular and chaotic patterns. Their statistical properties are therefore weak and delicate. They are characterized by a slow (power-law) decay of correlations, and as a result the classical central limit theorem fails. We prove that a non-classical central limit theorem holds, with a scaling factor of \({\sqrt{n\log n}}\) replacing the standard \({\sqrt{n}}\) . We also derive the respective Weak Invariance Principle, and we identify the class of observables for which the classical CLT still holds.
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Bálint, P., Chernov, N. & Dolgopyat, D. Limit Theorems for Dispersing Billiards with Cusps. Commun. Math. Phys. 308, 479–510 (2011). https://doi.org/10.1007/s00220-011-1342-6
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DOI: https://doi.org/10.1007/s00220-011-1342-6