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arXiv · 1912.13189

Entropies and volume growth of unstable manifolds

Yuntao Zang
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Abstract

Let $f$ be a $C^2$ diffeomorphism on a compact manifold. Ledrappier and Young introduced entropies along unstable foliations for an ergodic measure $\mu$. We relate those entropies to covering numbers in order to give a new upper bound on the metric entropy of $\mu$ in terms of Lyapunov exponents and topological entropy or volume growth of sub-manifolds. We also discuss extensions to the $C^{1+\alpha},\,\alpha>0$ case.

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Yuntao Zang. 2019-12-31. Entropies and volume growth of unstable manifolds. https://doi.org/10.1017/etds.2021.2

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