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arXiv 2607.02147math.GR
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关于双曲群的增长谱

On the growth spectrum of hyperbolic groups

Université Bourgogne Europe, CNRS, IMB UMR 5584(勃艮第欧洲大学);Dept of Math, Yale(耶鲁大学数学系);Dept. of Math, Weizmann Institute(魏茨曼科学研究所数学系)

Rémi Coulon, Michail Louvaris, Daniel T. Wise, Gal Yehuda

AI总结:

研究作用于双曲空间的群的增长谱,证明自由群和曲面群的增长谱为全区间[0, ω_G],双曲群的增长谱包含大区间[0, ω_F],并给出自由群情形下增长率密度与随机图谱集中性的联系。

摘要:

我们研究作用于双曲空间的群的增长谱,即子群达到的指数增长率集合。对于有限生成自由群或曲面群在真测地双曲度量空间上凸余紧作用,我们证明增长谱是整个区间 $[0, \omega_G]$。对于任意双曲群,我们证明增长谱包含一个大区间 $[0, \omega_{\mathcal{F}}]$,其中 $\omega_{\mathcal{F}} \geq \omega_G / 2$,当作用发散时严格不等式成立。在自由群的凯莱图情形,我们还通过配置模型的非回溯矩阵给出一种方法,将增长率密度与随机图的谱集中性联系起来。

英文摘要:

We study the growth spectrum of groups acting on hyperbolic spaces, i.e.\ the set of exponential growth rates achieved by subgroups. For a finitely generated free group or a surface group acting convex-cocompactly on a proper geodesic hyperbolic metric space, we prove that the growth spectrum is the full interval $[0, ω_G]$. For any hyperbolic group, we prove that the growth spectrum contains a large interval $[0, ω_{\mathcal{F}}]$ where $ω_{\mathcal{F}} \geq ω_G / 2$, with strict inequality when the action is divergent. In the case of the Cayley graph of a free group, we also present an approach via the non-backtracking matrix of the configuration model, connecting the density of growth rates to a spectral concentration result for random graphs.

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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