Bounded geometry for PCF-special subvarieties

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Hauptverfasser: DeMarco, Laura, Mavraki, Niki Myrto, Ye, Hexi
Format: Preprint
Veröffentlicht: 2024
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author DeMarco, Laura
Mavraki, Niki Myrto
Ye, Hexi
author_facet DeMarco, Laura
Mavraki, Niki Myrto
Ye, Hexi
contents For each integer $d\geq 2$, let $M_d$ denote the moduli space of maps $f: \mathbb{P}^1\to \mathbb{P}^1$ of degree $d$. We study the geometric configurations of subsets of postcritically finite (or PCF) maps in $M_d$. A complex-algebraic subvariety $Y \subset M_d$ is said to be PCF-special if it contains a Zariski-dense set of PCF maps. Here we prove that there are only finitely many positive-dimensional irreducible PCF-special subvarieties in $M_d$ with degree $\leq D$. In addition, there exist constants $N = N(D,d)$ and $B = B(D,d)$ so that for any complex algebraic subvariety $X \subset M_d$ of degree $\leq D$, the Zariski closure $\overline{X\cap\mathrm{PCF}}~$ has at most $N$ irreducible components, each with degree $\leq B$. We also prove generalizations of these results for points with small critical height in $M_d(\bar{\mathbb{Q}})$.
format Preprint
id arxiv_https___arxiv_org_abs_2405_17343
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Bounded geometry for PCF-special subvarieties
DeMarco, Laura
Mavraki, Niki Myrto
Ye, Hexi
Dynamical Systems
Algebraic Geometry
Number Theory
For each integer $d\geq 2$, let $M_d$ denote the moduli space of maps $f: \mathbb{P}^1\to \mathbb{P}^1$ of degree $d$. We study the geometric configurations of subsets of postcritically finite (or PCF) maps in $M_d$. A complex-algebraic subvariety $Y \subset M_d$ is said to be PCF-special if it contains a Zariski-dense set of PCF maps. Here we prove that there are only finitely many positive-dimensional irreducible PCF-special subvarieties in $M_d$ with degree $\leq D$. In addition, there exist constants $N = N(D,d)$ and $B = B(D,d)$ so that for any complex algebraic subvariety $X \subset M_d$ of degree $\leq D$, the Zariski closure $\overline{X\cap\mathrm{PCF}}~$ has at most $N$ irreducible components, each with degree $\leq B$. We also prove generalizations of these results for points with small critical height in $M_d(\bar{\mathbb{Q}})$.
title Bounded geometry for PCF-special subvarieties
topic Dynamical Systems
Algebraic Geometry
Number Theory
url https://arxiv.org/abs/2405.17343