arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.11233math.NTmath.DS
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伽罗瓦群与随机二次序列中的素除子

Galois groups and prime divisors in random quadratic sequences

John R. Doyle, Vivian Olsiewski Healey, Wade Hindes, Rafe Jones

摘要:

给定定义在域上的集合$S=\{x^2+c_1,\dots,x^2+c_s\}$和$S$的元素的无穷序列$γ$,可以将树表示与$γ$相关联,从而推广迭代单个多项式的情况。我们研究了随机序列$γ$产生"大图像“表示的概率,这意味着在自然过滤中无穷多个subconjuncents是最大的。我们证明,这个概率是积极的大多数集$S$定义在$\mathbb{Z}[t]$,我们猜想一个类似的积极的概率结果适合集在$\mathbb{Q}$。作为大象表示的一个应用,我们证明了一些相关的二次序列的素除子集的密度为零的结果。我们还考虑了更强的条件下的表示有限指数,我们分类所有的$S$拥有一种特殊的障碍,概括了后临界有限的情况下,在单多项式迭代。

英文摘要:

Given a set $S=\{x^2+c_1,\dots,x^2+c_s\}$ defined over a field and an infinite sequence $γ$ of elements of $S$, one can associate an arboreal representation to $γ$, generalizing the case of iterating a single polynomial. We study the probability that a random sequence $γ$ produces a ``large-image'' representation, meaning that infinitely many subquotients in the natural filtration are maximal. We prove that this probability is positive for most sets $S$ defined over $\mathbb{Z}[t]$, and we conjecture a similar positive-probability result for suitable sets over $\mathbb{Q}$. As an application of large-image representations, we prove a density-zero result for the set of prime divisors of some associated quadratic sequences. We also consider the stronger condition of the representation being finite-index, and we classify all $S$ possessing a particular kind of obstruction that generalizes the post-critically finite case in single-polynomial iteration.

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