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arXiv · 2202.12372

The parabolic and near-parabolic renormalization for a class of polynomial maps and its applications

X. Zhang
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Abstract

For a class of polynomial maps of one variable with a parabolic fixed points and degrees bigger than $21$, the parabolic renormalization is introduced based on Fatou coordinates and horn maps, and a type of maps which are invariant under the parabolic renormalization is also given. For the small perturbation of these kinds of maps, the near-parabolic renormalization is also introduced based on the first return maps defined on the fundamental regions. As an application, we show the existence of non-renormalizable polynomial maps with degrees bigger than $21$ such that the Julia sets have positive Lebesgue measure and Cremer fixed points, this provides a positive answer for the classical Fatou conjecture (the existence of Julia set with positive area) with degrees bigger than $21$.

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X. Zhang. 2022-02-24. The parabolic and near-parabolic renormalization for a class of polynomial maps and its applications. https://arxiv.org/abs/2202.12372

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