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arXiv 1909.01577math.GRmath.GTmath.PR
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相对双曲群Martin边界的稳定性现象

Stability phenomena for Martin boundaries of relatively hyperbolic groups

Matthieu Dussaule, Ilya Gekhtman

摘要:

设$Γ$是一个相对双曲群,$μ$是$Γ$上的一个容许对称双曲支撑概率测度.本文将Floor-Ancona型不等式推广到$μ$的谱半径.然后,我们表明,当抛物子群几乎阿贝尔,马丁边界的诱导随机游动$Γ$是稳定的Picardello和Woess的意义。我们还定义了沿抛物子群谱退化的概念,并给出了Martin边界在谱退化下的强稳定性判据.我们证明了这个准则总是满足小秩。特别地,在维数至多为5的几何有限Kleinian群上支持概率测度的可容许的对称对称的Martin边界总是强稳定的。

英文摘要:

Let $Γ$ be a relatively hyperbolic group and let $μ$ be an admissible symmetric finitely supported probability measure on $Γ$. We extend Floyd-Ancona type inequalities up to the spectral radius of $μ$. We then show that when the parabolic subgroups are virtually abelian, the Martin boundary of the induced random walk on $Γ$ is stable in the sense of Picardello and Woess. We also define a notion of spectral degenerescence along parabolic subgroups and give a criterion for strong stability of the Martin boundary in terms of spectral degenerescence. We prove that this criterion is always satisfied in small rank. so that in particular, the Martin boundary of an admissible symmetric finitely supported probability measure on a geometrically finite Kleinian group of dimension at most 5 is always strongly stable.

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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