Multifractal analysis of the divergence points of Birkhoff averages in $beta$-dynamical systems

This paper is aimed at a detailed study of the multifractal analysis of the so-called divergence points in the system of $β$-expansions. More precisely, let $([0,1),T_β)$ be the $β$-dynamical system for a general $β>1$ and $ψ:[0,1]\mapsto\mathbb{R}$ be a continuous function. Denote by $\textsf{A}(ψ,x)$ all the accumulation points of $\Big\{\frac{1}{n}\sum_{j=0}^{n-1}ψ(T^jx): n\ge 1\Big\}$. The Hausdorff dimensions of the sets $\Big\{x:\textsf{A}(ψ,x)\supset[a,b]\Big\},\ \ \Big\{x:\textsf{A}(ψ,x)=[a,b]\Big\}, \ \Big\{x:\textsf{A}(ψ,x)\subset[a,b]\Big\}$ i.e., the points for which the Birkhoff averages of $ψ$ do not exist but behave in a certain prescribed way, are determined completely for any continuous function $ψ$.

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