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arXiv 0901.4526math.DSmath.GR
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复动力学中的单值群块

Blocks of monodromy groups in Complex Dynamics

Rafe Jones, Han Peters

摘要:

受复杂动力学中的一个问题的启发,我们研究了单值群在一个泛点的原像树上的自然作用的块结构。我们表明,在许多情况下,包括当多项式具有素数幂度时,除了那些自然从树结构中产生的块之外,没有大块。然而,使用一种基于多项式实图的构造方法,我们展示了一个非平凡的例子,一个6次多项式没有这个属性。这个例子解决了第二作者在最近的一篇论文中提出的关于复平面中多项式的常加权和的问题。我们还表明,程度6是例外的另一方面,因为它是最低程度的monodromy组的多项式是不确定的组合后临界集。这些结果给出了迭代单值群在复动力学中的新应用。

英文摘要:

Motivated by a problem in complex dynamics, we examine the block structure of the natural action of monodromy groups on the tree of preimages of a generic point. We show that in many cases, including when the polynomial has prime power degree, there are no large blocks other than those arising naturally from the tree structure. However, using a method of construction based on real graphs of polynomials, we exhibit a non-trivial example of a degree 6 polynomial failing to have this property. This example settles a problem raised in a recent paper of the second author regarding constant weighted sums of polynomials in the complex plane. We also show that degree 6 is exceptional in another regard, as it is the lowest degree for which the monodromy group of a polynomial is not determined by the combinatorics of the post-critical set. These results give new applications of iterated monodromy groups to complex dynamics.

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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