Abstract
We consider the geodesic flow for a rank one non-positive curvature closed manifold. We prove an asymptotic version of the Central Limit Theorem for families of measures constructed from regular closed geodesics converging to the Bowen-Margulis-Knieper measure of maximal entropy. The technique expands on ideas of Denker, Senti and Zhang, who proved this type of asymptotic Lindeberg Central Limit Theorem on periodic orbits for expansive maps with the specification property. We extend these techniques from the uniform to the non-uniform setting, and from discrete-time to continuous-time. We consider Hölder observables subject only to the Lindeberg condition and a weak positive variance condition. If we assume a natural strengthened positive variance condition, the Lindeberg condition is always satisfied. Our results extend to dynamical arrays of Hölder observables, and to weighted periodic orbit measures which converge to a unique equilibrium state.
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This work is partially supported by NSF grants DMS-1461163 and DMS-1954463.
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Thompson, D.J., Wang, T. Fluctuations of Time Averages Around Closed Geodesics in Non-Positive Curvature. Commun. Math. Phys. 385, 1213–1243 (2021). https://doi.org/10.1007/s00220-021-04062-6
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DOI: https://doi.org/10.1007/s00220-021-04062-6