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arXiv 1801.09003math.DSmath.AGmath.NT
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分圆二次域上二次多项式的预周期点

Preperiodic points for quadratic polynomials over cyclotomic quadratic fields

John R. Doyle

摘要:

给定数域$K$和次数至少为2的多项式$f(z) \in K[z]$,可以构造一个有限有向图$G(f,K)$,其顶点是$K$ -$f$的有理预周期点,有边$α\to β$当且仅当$f(α) = β$。限制到二次多项式,莫顿和西尔弗曼的动力学一致有界性猜想表明,对于一个给定的数域$K$,应该只有1000个同构类的有向图,以这种方式出现。Poonen给出了$\mathbb{Q}$上所有此类有向图的完全分类,而作者Faber和Krumm最近的工作为$\mathbb{Q}$的所有二次扩展提供了这个问题的详细研究。在这篇文章中,我们给出了一个类似Poonen的完全分类,但是是在分圆二次域$\mathbb{Q}(\sqrt{-1})$和$\mathbb{Q}(\sqrt{-3})$上的。我们使用的主要工具是动力模曲线和曲线上二次点的结果。

英文摘要:

Given a number field $K$ and a polynomial $f(z) \in K[z]$ of degree at least 2, one can construct a finite directed graph $G(f,K)$ whose vertices are the $K$-rational preperiodic points for $f$, with an edge $α\to β$ if and only if $f(α) = β$. Restricting to quadratic polynomials, the dynamical uniform boundedness conjecture of Morton and Silverman suggests that for a given number field $K$, there should only be finitely many isomorphism classes of directed graphs that arise in this way. Poonen has given a conjecturally complete classification of all such directed graphs over $\mathbb{Q}$, while recent work of the author, Faber, and Krumm has provided a detailed study of this question for all quadratic extensions of $\mathbb{Q}$. In this article, we give a conjecturally complete classification like Poonen's, but over the cyclotomic quadratic fields $\mathbb{Q}(\sqrt{-1})$ and $\mathbb{Q}(\sqrt{-3})$. The main tools we use are dynamical modular curves and results concerning quadratic points on curves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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