Acta mathematica scientia,Series B ›› 2025, Vol. 45 ›› Issue (4): 1659-1673.doi: 10.1007/s10473-025-0422-1

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HAUSDORFF DIMENSION OF RECURRENCE SETS FOR MATRIX TRANSFORMATIONS OF TORI

Zhangnan HU1, Bing LI2,*   

  1. 1. College of Science, China University of Petroleum, Beijing 102249, China;
    2. School of Mathematics, South China University of Technology, Guangzhou 510641, China
  • Received:2024-03-29 Revised:2024-08-15 Online:2025-10-10 Published:2025-10-10
  • Contact: *Bing LI, E-mail: scbingli@scut.edu.cn
  • About author:Zhangnan HU, E-mail: hnlgdxhzn@163.com
  • Supported by:
    Science Founda-tion of China University of Petroleum, Beijing (2462023SZBH013), the China Postdoctoral Science Foundation (2023M743878) and the Postdoctoral Fellowship Program of CPSF (GZB20240848). Li's research was supported partially by the NSFC (12271176) and the Guangdong Natural Science Foundation (2024A1515010946).

Abstract: Let $T\colon\mathbb{T}^d\to \mathbb{T}^d$, defined by $T x=Ax$ (mod 1), where $A$ is a $d\times d$ integer matrix with eigenvalues $1<|\lambda_1|\le|\lambda_2|\le\cdots\le|\lambda_d|$. We investigate the Hausdorff dimension of the recurrence set $$R(\psi):=\{x\in\mathbb{T}^d\colon T^nx\in B(x,\psi(n)) for infinitely many n\}$$ for $\alpha\ge\log|\lambda_d/\lambda_1|$, where $\psi$ is a positive decreasing function defined on $\mathbb{N}$ and its lower order at infinity is $\alpha=\liminf\limits_{n\to\infty}\frac{-\log \psi(n)}{n}$. In the case that $A$ is diagonalizable over $\mathbb{Q}$ with integral eigenvalues, we obtain the dimension formula.

Key words: quantitative recurrence properties, Hausdorff dimension, matrix transformations

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