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arXiv · 2603.28577

Parabolic implosion in dimension 2

Matthieu Astorg·Lorena López-Hernanz·Jasmin Raissy
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Abstract

In this paper, we extend the theory of parabolic implosion in complex dimension 2 to the case of holomorphic maps tangent to the identity at order 2. We investigate the bifurcation phenomena that occur when a fully parabolic fixed point is perturbed. Under the assumption of a non-degenerate characteristic direction with a formal invariant curve and director $\alpha$ satisfying $\re\alpha> 2$, we establish the existence of Lavaurs maps as limits of iterates $f_{\epsilon_n}^n$ for specific sequences of the perturbation parameter $\epsilon_n$. Finally, we apply these results to prove the discontinuity of the Julia sets $J_1$ and $J_2$ for holomorphic endomorphisms of $\mathbb{P}^2$, generalizing classical one-dimensional results to this higher-dimensional setting.

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Matthieu Astorg, Lorena López-Hernanz, Jasmin Raissy. 2026-03-30. Parabolic implosion in dimension 2. https://arxiv.org/abs/2603.28577

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