Equidistribution of non-uniformly stretching translates of shrinking smooth curves and weighted Dirichlet approximation

We show that under the action of \(\mathrm{diag}(e^{nt},e^{-r_1(t)},\ldots,e^{-r_n(t)})\in\mathrm{SL}(n+1,\mathbb{R})\), where \(r_i(t)\to\infty\), on the space of unimodular lattices in \(\mathbb{R}^{n+1}\), the translates of any fixed-sized piece of a `non-degenerate' smooth curve, or a shrin...

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Bibliographic Details
Published inarXiv.org
Main Authors Shah, Nimish A, Yang, Pengyu
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.11.2022
Subjects
Approximation
Dirichlet problem
Lattices
Mathematical analysis
Mathematics - Dynamical Systems
Mathematics - Number Theory
Mathematics - Representation Theory
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Summary:We show that under the action of \(\mathrm{diag}(e^{nt},e^{-r_1(t)},\ldots,e^{-r_n(t)})\in\mathrm{SL}(n+1,\mathbb{R})\), where \(r_i(t)\to\infty\), on the space of unimodular lattices in \(\mathbb{R}^{n+1}\), the translates of any fixed-sized piece of a `non-degenerate' smooth curve, or a shrinking piece of size \(e^{-t}\) about almost any point of the curve, get equidistributed in the space as \(t\to\infty\). From this, it follows that the weighted Dirichlet approximation theorem cannot be improved for almost all points on any non-degenerate \(C^{2n}\) curve in \(\mathbb{R}^n\). This result extends the corresponding result for analytic curves due to Shah (2009) and answers some questions inspired by the work of Davenport and Schmidt (1969) and Kleinbock and Weiss (2008).
ISSN:2331-8422
DOI:10.48550/arxiv.2204.03194