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arXiv 2307.08400math.GR
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双曲空间上具有正常乘积作用的群的均匀指数增长

Uniform exponential growth for groups with proper product actions on hyperbolic spaces

Renxing Wan, Wenyuan Yang

AI总结:

本文研究有限生成群在双曲空间有限乘积上的正常作用,证明在粗稠密轨道或阴影性质下非虚阿贝尔子群具有均匀指数增长,并在弱非柱状条件下给出乘积集增长的完整分类。

摘要:

本文研究了有限生成群$G$在双曲空间的有限乘积上正常作用时的局部均匀指数增长和乘积集增长。在因子具有粗稠密轨道或阴影性质的假设下,我们证明了任何有限生成的非虚阿贝尔子群都具有均匀指数增长。这些假设在许多层级双曲群中成立,包括映射类群、特殊立方群和BMW群。此外,如果$G$在每个因子上弱非柱状作用,我们证明,除两类例外子群外,$G$具有均匀乘积集增长。作为推论,这给出了对离散作用于具有负曲率收缩的简单连通流形上的任何群、在树上非柱状作用的群以及3-流形群的具有乘积集增长的子群的完整分类。

英文摘要:

This paper studies the locally uniform exponential growth and product set growth for a finitely generated group $G$ acting properly on a finite product of hyperbolic spaces. Under the assumption of coarsely dense orbits or shadowing property on factors, we prove that any finitely generated non-virtually abelian subgroup has uniform exponential growth. These assumptions are fulfilled in many hierarchically hyperbolic groups, including mapping class groups, specially cubulated groups and BMW groups. Moreover, if $G$ acts weakly acylindrically on each factor, we show that, with two exceptional classes of subgroups, $G$ has uniform product set growth. As corollaries, this gives a complete classification of subgroups with product set growth for any group acting discretely on a simply connected manifold with pinched negative curvature, for groups acting acylindrically on trees, and for 3-manifold groups.

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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