Growth and Zeros of the Zeta Function for Hyperbolic Rational Maps

Details Growth and Zeros of the Zeta Function for Hyperbolic Rational Maps Growth and Zeros of the Zeta Function for Hyperbolic Rational Maps

2004-04-30

arxiv.org/abs/math/0404543v2

Mathematics

Dynamical Systems

18 pages, 1 figure Expanded Lemma 5.2 and moved to an appendix

Scientific paper

This paper describes new results on the growth and zeros of the Ruelle zeta function for the Julia set of a hyperbolic rational map. It is shown that the zeta function is bounded by $\exp(C_K |s|^{\delta})$ in strips $|\Re s| \leq K$, where $\delta$ is the dimension of the Julia set. This leads to bounds on the number of zeros in strips (interpreted as the Pollicott-Ruelle resonances of this dynamical system). An upper bound on the number of zeros in polynomial regions $\{|\Re s | \leq |\Im s|^\alpha\}$ is given, followed by weaker lower bound estimates in strips $\{\Re s > -C, |\Im s|\leq r\}$, and logarithmic neighbourhoods $\{|\Re s | \leq \rho \log |\Im s| \}$. Recent numerical work of Strain-Zworski suggests the upper bounds in strips are optimal.

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