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arXiv 2007.12535math.GRmath.MG
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分层双曲群中的无界域

Unbounded domains in hierarchically hyperbolic groups

Harry Petyt, Davide Spriano

摘要:

研究了层次双曲群中的无界区域,得到了对可能的层次结构的约束。利用这些见解,我们证明了几乎阿贝尔HHGs的结构,并表明HHGs类是不封闭的有限扩张。这提供了一个强有力的答案的问题,是否是一个HHG是不变的准等距。一路上,我们证明了无限挠群不是HHG。通过排除病态行为,我们能够给出更简单,直接的证明的秩刚性和综合子群定理的HHG。这涉及到扩展我们的技术,使它们适用于所有的HHG的子组。

英文摘要:

We investigate unbounded domains in hierarchically hyperbolic groups and obtain constraints on the possible hierarchical structures. Using these insights, we characterise the structures of virtually abelian HHGs and show that the class of HHGs is not closed under finite extensions. This provides a strong answer to the question of whether being an HHG is invariant under quasiisometries. Along the way, we show that infinite torsion groups are not HHGs. By ruling out pathological behaviours, we are able to give simpler, direct proofs of the rank-rigidity and omnibus subgroup theorems for HHGs. This involves extending our techniques so that they apply to all subgroups of HHGs.

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