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arXiv 2107.02403math.DS
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amenable groups的遍历平均的涨落界

Fluctuation bounds for ergodic averages of amenable groups

Andrew Warren

摘要:

我们研究了顺从群体的行为所产生的遍历平均值的波动。在一致凸巴拿赫空间上局部紧第二可数顺从群的抽象遍历定理的基础上,我们导出了一类满足类似Lindenstrauss暴烈条件的Følner序列的遍历平均涨落数的高度一致界.等价地,我们推导出任意Følner序列在长距离上的涨落数的一致界。作为推论,这些结果暗示了顺从群在具有$p\in(1,\infty)$的$σ$ -有限$L^{p}$空间上的连续作用的相关界。

英文摘要:

We study fluctuations of ergodic averages generated by actions of amenable groups. In the setting of an abstract ergodic theorem for locally compact second countable amenable groups acting on uniformly convex Banach spaces, we deduce a highly uniform bound on the number of fluctuations of the ergodic average for a class of Følner sequences satisfying an analogue of Lindenstrauss's temperedness condition. Equivalently, we deduce a uniform bound on the number of fluctuations over long distances for arbitrary Følner sequences. As a corollary, these results imply associated bounds for a continuous action of an amenable group on a $σ$-finite $L^{p}$ space with $p\in(1,\infty)$.

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