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Fast and slow points of Birkhoff sums

Part of: Classical measure theory Probabilistic theory: distribution modulo $1$; metric theory of algorithms Limit theorems Ergodic theory

Published online by Cambridge University Press:  11 July 2019

FRÉDÉRIC BAYART ,
ZOLTÁN BUCZOLICH  and
YANICK HEURTEAUX
FRÉDÉRIC BAYART
Affiliation:
Université Clermont Auvergne, LMBP, UMR 6620 – CNRS, Campus des Cézeaux, 3 place Vasarely, TSA 60026, CS 60026 F-63178 Aubière Cedex, France Department of Analysis, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/c, 1117Budapest, Hungary email [email protected], [email protected], [email protected]
ZOLTÁN BUCZOLICH
Affiliation:
Department of Analysis, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/c, 1117Budapest, Hungary email [email protected], [email protected], [email protected]
YANICK HEURTEAUX
Affiliation:
Université Clermont Auvergne, LMBP, UMR 6620 – CNRS, Campus des Cézeaux, 3 place Vasarely, TSA 60026, CS 60026 F-63178 Aubière Cedex, France Department of Analysis, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/c, 1117Budapest, Hungary email [email protected], [email protected], [email protected]
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Abstract

We investigate the growth rate of the Birkhoff sums $S_{n,\unicode[STIX]{x1D6FC}}f(x)=\sum _{k=0}^{n-1}f(x+k\unicode[STIX]{x1D6FC})$, where $f$ is a continuous function with zero mean defined on the unit circle $\mathbb{T}$ and $(\unicode[STIX]{x1D6FC},x)$ is a ‘typical’ element of $\mathbb{T}^{2}$. The answer depends on the meaning given to the word ‘typical’. Part of the work will be done in a more general context.

Keywords

Birkhoff sumtypical/generic propertiesgroup rotationcoboundarylaw of iterated logarithm

MSC classification

Primary: 37A05: Measure-preserving transformations
Secondary: 11K55: Metric theory of other algorithms and expansions; measure and Hausdorff dimension 28A78: Hausdorff and packing measures 60F15: Strong theorems
Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 40 , Issue 12 , December 2020 , pp. 3236 - 3256
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Copyright
© Cambridge University Press, 2019

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