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arXiv 2008.06379math.GRmath.GT
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Morse测地线的正则性与稳定子群的增长性

Regularity of Morse geodesics and growth of stable subgroups

Matthew Cordes, Jacob Russell, Davide Spriano, Abdul Zalloum

摘要:

我们证明了Morse局部到全局群的增长速度比其无穷指数稳定子群的增长速度快。这将Dahmani,Futer和Wise在双曲群的拟凸子群的背景下的结果推广到包含映射类群,CAT(0)群和闭3-流形的基本群的广泛的一类群。为了实现这一点,我们开发了一个理论的自动结构莫尔斯测地线莫尔斯本地到全球的群体。这些自动结构的其他应用包括正则语言对稳定子群的描述、稳定子群增长的合理性、Morse元吸引不动点的Morse边界的密度以及任意无限正规子群的极限集内Morse边界的包容性。

英文摘要:

We prove that Morse local-to-global groups grow exponentially faster than their infinite index stable subgroups. This generalizes a result of Dahmani, Futer, and Wise in the context of quasi-convex subgroups of hyperbolic groups to a broad class of groups that contains the mapping class group, CAT(0) groups, and the fundamental groups of closed 3-manifolds. To accomplish this, we develop a theory of automatic structures on Morse geodesics in Morse local-to-global groups. Other applications of these automatic structures include a description of stable subgroups in terms of regular languages, rationality of the growth of stable subgroups, density in the Morse boundary of the attracting fixed points of Morse elements, and containment of the Morse boundary inside the limit set of any infinite normal subgroup.

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