English

Quantitative Matrix-Driven Diophantine approximation on $M_0$-sets

Number Theory 2025-05-01 v1

Abstract

Let E[0,1)dE\subset [0,1)^{d} be a set supporting a probability measure μ\mu with Fourier decay μ^(t)(logt)s|\widehat{\mu}({\bf{t}})|\ll (\log |{\bf{t}}|)^{-s} for some constant s>d+1.s>d+1. Consider a sequence of expanding integral matrices A=(An)nN\mathcal{A}=(A_n)_{n\in\N} such that the minimal singular values of An+1An1A_{n+1}A_{n}^{-1} are uniformly bounded below by K>1K>1. We prove a quantitative Schmidt-type counting theorem under the following constraints: (1) the points of interest are restricted to EE; (2) the denominators of the ``shifted'' rational approximations are drawn exclusively from A\mathcal{A}. Our result extends the work of Pollington, Velani, Zafeiropoulos, and Zorin (2022) to the matrix setting, advancing the study of Diophantine approximation on fractals. Moreover, it strengthens the equidistribution property of the sequence (Anx)nN(A_n{\bf x})_{n\in\N} for μ\mu-almost every xE.{\bf x}\in E. Applications include the normality of vectors and shrinking target problems on fractal sets.

Keywords

Cite

@article{arxiv.2504.21555,
  title  = {Quantitative Matrix-Driven Diophantine approximation on $M_0$-sets},
  author = {Bo Tan and Qing-Long Zhou},
  journal= {arXiv preprint arXiv:2504.21555},
  year   = {2025}
}
R2 v1 2026-06-28T23:16:39.794Z