A study in quantitative equidistribution on the unit square
Max Goering and Christian Weiss
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Submission date: 17. Jan. 2022 (revised version: May 2022)
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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 ⊂ [0,1]2 to the expected time. In this article, we prove that when E is in the algebra generated by convex sets the error is of order at most log(T)1+? for almost every direction. For all but countably many badly approximable directions, the bound can be sharpened to log(T)1∕2+?. 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.