Dynamics on projective K3 surfaces: Herman rings

Junyu Cao

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arXiv · 2609.38013

Dynamics on projective K3 surfaces: Herman rings

Junyu Cao

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Abstract

We construct an automorphism of a smooth projective K3 surface with positive topological entropy and a non-empty Fatou set. The Fatou set contains invariant domains biholomorphic to products of two annuli. On each domain, the automorphism is holomorphically conjugate to a fixed-point-free irrational rotation. These domains are two-dimensional analogues of Herman rings. The construction answers a question posed by McMullen in 2002 and several questions posed by Cantat in his 2018 ICM address.

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Junyu Cao. 2026-09-29. Dynamics on projective K3 surfaces: Herman rings. https://arxiv.org/abs/2609.38013

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