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arXiv 2402.11501math.GRmath.GT
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相对双曲群的膨胀冠

Blown-up corona of relatively hyperbolic groups

Tomohiro Fukaya

AI总结:

本文研究了相对双曲群的膨胀冠,证明了其等变性与紧致化的可缩性,给出了基于上同调维数确定覆盖维数的公式,并证明特定条件下膨胀冠同胚于Gromov边界。

摘要:

我们证明,在适当假设下,相对双曲群的膨胀冠是等变的,并且由膨胀冠对真作用空间的紧致化是可缩的。作为推论,我们建立了通过群的上同调维数确定膨胀冠覆盖维数的公式。我们还证明,相对于拟凸子群的几乎正规族,双曲群的膨胀冠同胚于该群的Gromov边界。

英文摘要:

We show that under appropriate assumptions, a blown-up corona of a relatively hyperbolic group is equivariant and the compactification of the universal space for proper action by the blown-up corona is contractible. As a corollary, we establish the formula to determine the covering dimension of the blown-up corona by the cohomological dimension of the group. We also show that the blown-up corona of a hyperbolic group with respect to an almost malnormal family of quasiconvex subgroups is homeomorphic to the Gromov boundary of the group.

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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