On the Intersection of Dynamical Covering Sets with Fractals

Abstract

Let $(X,\mathcal{B},\mu ,T,d)$ be a measure-preserving dynamical system with exponentially mixing property, and let $\mu$ be an Ahlfors $s$-regular probability measure. The dynamical covering problem concerns the set $E(x)$ of points which are covered by the orbits of $x\in X$ infinitely many times. We prove that the Hausdorff dimension of the intersection of $E(x)$ and any regular fractal $G$ equals ${\dim }_{\mathrm{H}}G+\alpha -s$, where $\alpha ={\dim }_{\mathrm{H}}E(x)$ $\mu$--a.e. Moreover, we obtain the packing dimension of $E(x)\cap G$ and an estimate for ${\dim }_{\mathrm{H}}(E(x)\cap G)$ for any analytic set $G$.

27pages