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arXiv 1802.09077math.GRmath.PR
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周期Grigorchuk群的增长性

Growth of periodic Grigorchuk groups

Anna Erschler, Tianyi Zheng

摘要:

在挠Grigorchuk群上,我们构造了有限熵的随机游动和具有非平凡Poisson边界的幂律尾衰变.这种随机游动为这些组提供了接近最优的体积较低估计。特别地,对于第一Grigorchuk群$G$,我们证明了它的体积增长函数$v_{G,S}(n)$满足$\lim_{n\to\infty}\log\log v_{G,S}(n)/\log n=α_{0}$,其中$α_{0}=\frac{\log2}{\logλ_{0}}\approx0.7674$,$λ_{0}$是多项式$X^{3}-X^{2}-2X-4$的正根。

英文摘要:

On torsion Grigorchuk groups we construct random walks of finite entropy and power-law tail decay with non-trivial Poisson boundary. Such random walks provide near optimal volume lower estimates for these groups. In particular, for the first Grigorchuk group $G$ we show that its volume growth function $v_{G,S}(n)$ satisfies that $\lim_{n\to\infty}\log\log v_{G,S}(n)/\log n=α_{0}$, where $α_{0}=\frac{\log2}{\logλ_{0}}\approx0.7674$, $λ_{0}$ is the positive root of the polynomial $X^{3}-X^{2}-2X-4$.

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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