Limit Theorems in the Stadium Billiard
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- Bálint, P. & Gouëzel, S. Commun. Math. Phys. (2006) 263: 461. doi:10.1007/s00220-005-1511-6
We prove that the Birkhoff sums for ``almost every'' relevant observable in the stadium billiard obey a non-standard limit law. More precisely, the usual central limit theorem holds for an observable if and only if its integral along a one-codimensional invariant set vanishes, otherwise a normalization is needed. As one of the two key steps in the argument, we obtain a limit theorem that holds in Young towers with exponential return time statistics in general, an abstract result that seems to be applicable to many other situations.