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A study in quantitative equidistribution on the unit square

Volume 205 / 2022

Max Goering, Christian Weiss Acta Arithmetica 205 (2022), 63-85 MSC: Primary 11K38; Secondary 37E35, 11B50. DOI: 10.4064/aa220224-25-7 Published online: 26 August 2022


The distributional properties of the translation flow on the unit square have been considered in different fields of mathematics, including algebraic geometry and discrepancy theory. One method to quantify equidistribution is to compare the error between the actual time the translation flow spent in specific sets $E \subset [0,1]^2$ to the expected time. We prove that when $E$ is in the algebra generated by convex sets the error is of order at most $\log (T)^{1+\varepsilon }$ for almost every direction. For all but countably many badly approximable directions, the bound can be sharpened to $\log (T)^{1/2+\varepsilon }$. The error estimates we produce are smaller than for general measurable sets as proved by Beck, while our class of examples is larger than in the work of Grepstad–Larcher who obtained the bounded remainder property for their sets. Our proof relies on the duality between local convexity of the boundary and regularity of sections of the flow.


  • Max GoeringMax-Planck-Institut für Mathematik
    in den Naturwissenschaften
    Inselstr. 22
    04103 Leipzig, Germany
  • Christian WeissRuhr West University of Applied Sciences
    Duisburger Str. 100
    45479 Mülheim an der Ruhr, Germany

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