dorsal/arxiv
View SchemaRigidity of the escaping set of polynomial automorphisms of $\mathbb{C}^2$
| Authors | Sayani Bera, Kaushal Verma |
|---|---|
| Categories | |
| ArXiv ID | 2601.07681vv1 |
| URL | https://arxiv.org/abs/2601.07681 |
| License | http://creativecommons.org/licenses/by-sa/4.0/ |
Abstract
Let $H$ be a polynomial automorphism of $\mathbb{C}^2$ of positive entropy and degree $d \ge 2$. We prove that the escaping set $U^+$ (or equivalently, the non-escaping set $K^+$), of $H$ is rigid under the action of holomorphic automorphisms of $\mathbb{C}^2$. Specifically, every holomorphic automorphism of $\mathbb{C}^2$ that preserves $U^+$ takes the form $L \circ H^s$ where $s \in \mathbb{Z}$ and $L$ belongs to a finite cyclic group of affine maps that preserve the escaping set. Second, note that the sub-level sets $\{G^+ < c\}$, $c > 0$, of the Greens function $G^+$ associated with the map $H$ are canonical examples of Short $\mathbb{C}^2$s. As a consequence of the above theorem, we show that the holomorphic automorphisms of these Short $\mathbb{C}^2$s are affine automorphisms of $\mathbb{C}^2$ preserving the escaping set $U^+$. Hence, the automorphism group of these Short $\mathbb{C}^2$s are the same for every $c>0$ and is a finite cyclic group.
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"abstract": "Let $H$ be a polynomial automorphism of $\\mathbb{C}^2$ of positive entropy and degree $d \\ge 2$. We prove that the escaping set $U^+$ (or equivalently, the non-escaping set $K^+$), of $H$ is rigid under the action of holomorphic automorphisms of $\\mathbb{C}^2$. Specifically, every holomorphic automorphism of $\\mathbb{C}^2$ that preserves $U^+$ takes the form $L \\circ H^s$ where $s \\in \\mathbb{Z}$ and $L$ belongs to a finite cyclic group of affine maps that preserve the escaping set.\n Second, note that the sub-level sets $\\{G^+ \u003c c\\}$, $c \u003e 0$, of the Greens function $G^+$ associated with the map $H$ are canonical examples of Short $\\mathbb{C}^2$s. As a consequence of the above theorem, we show that the holomorphic automorphisms of these Short $\\mathbb{C}^2$s are affine automorphisms of $\\mathbb{C}^2$ preserving the escaping set $U^+$. Hence, the automorphism group of these Short $\\mathbb{C}^2$s are the same for every $c\u003e0$ and is a finite cyclic group.",
"arxiv_id": "2601.07681",
"authors": [
"Sayani Bera",
"Kaushal Verma"
],
"categories": [
"math.CV",
"math.DS"
],
"license": "http://creativecommons.org/licenses/by-sa/4.0/",
"title": "Rigidity of the escaping set of polynomial automorphisms of $\\mathbb{C}^2$",
"url": "https://arxiv.org/abs/2601.07681",
"version": "v1"
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