A Limit Theorem for Birkoff sums of non-integrable functions over rotations

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Sinai, Yakov G.
Ulcigrai, Corinna
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We consider Birkhoff sums of functions with a singularity of type 1/x over rotations and prove the following limit theorem. Let $S_N= S_N(\alpha,x)$ be the N^th non-renormalized Birkhoff sum, where $x in [0,1)$ is the initial point, $\alpha\in [0,1)$ is the rotation number and $(\alpha, x)$ are uniformly distributed. We prove that $S_N/N$ has a joint limiting distribution in $(\alpha,x)$ as N tends to infinity. As a corollary, we get the existence of a limiting distribution for certain trigonometric sums.
Comment: 24 pages, some typos corrected, final version to appear in ``Probabilistic and Geometric Structures in Dynamics'', edited by K. Burns, D. Dolgopyat, and Ya. Pesis, American Mathematical Society, Contemporary Mathematics Series
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Mathematics - Dynamical Systems
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