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Entropy of meromorphic maps acting on analytic sets

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arxiv 1807.06483 v1 pith:DOUT2Z5A submitted 2018-07-17 math.CV math.DS

Entropy of meromorphic maps acting on analytic sets

classification math.CV math.DS
keywords mathrmentropyanalyticdimensionextendmapsmeromorphicnotion
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Let $f : X\to X$ be a dominating meromorphic map on a compact K\"ahler manifold $X$ of dimension $k$. We extend the notion of topological entropy $h^l_{\mathrm{top}}(f)$ for the action of $f$ on (local) analytic sets of dimension $0\leq l \leq k$. For an ergodic probability measure $\nu$, we extend similarly the notion of measure-theoretic entropy $h_{\nu}^l(f)$. Under mild hypothesis, we compute $h^l_{\mathrm{top}}(f)$ in term of the dynamical degrees of $f$. In the particular case of endomorphisms of $\mathbb{P}^2$ of degree $d$, we show that $h^1_{\mathrm{top}}(f)= \log d$ for a large class of maps but we give examples where $h^1_{\mathrm{top}}(f)\neq \log d$.

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