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On self-affine measures with equal Hausdorff and Lyapunov dimensions (1511.06893v1)

Published 21 Nov 2015 in math.DS

Abstract: Let $\mu$ be a self-affine measure on $\mathbb{R}{d}$ associated to a self-affine IFS ${\varphi_{\lambda}(x) = A_{\lambda}x + v_{\lambda}}{\lambda\in\Lambda}$ and a probability vector $p=(p{\lambda}){\lambda}>0$. Assume the strong separation condition holds. Let $\gamma{1}\ge...\ge\gamma_{d}$ and $D$ be the Lyapunov exponents and dimension corresponding to ${A_{\lambda}}{\lambda\in\Lambda}$ and $p{\mathbb{N}}$, and let $\mathbf{G}$ be the group generated by ${A{\lambda}}{\lambda\in\Lambda}$. We show that if $\gamma{m+1}>\gamma_{m}=...=\gamma_{d}$, if $\mathbf{G}$ acts irreducibly on the vector space of alternating $m$-forms, and if the Furstenberg measure $\mu_{F}$ satisfies $\dim_{H}\mu_{F}+D>(m+1)(d-m)$, then $\mu$ is exact dimensional with $\dim\mu=D$.

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