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arXiv 2609.18061math.DSmath.PR

可测动力学中的有界链式性质

Bounded chaining in measurable dynamics

Anush Tserunyan, Jenna Zomback

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中文总结 AI 辅助

本文引入介于双遍历性与度量遍历性之间的k-链式性质,作为新不变量区分弱混合作用,并证明自由群边界作用中弱混合等价于(2r-1)-链式及转移矩阵严格不可约。

中文摘要 AI 辅助

我们引入了一个单参数族的概念,介于双遍历性与度量遍历性之间,用于可数群在标准概率空间上保持测度类(即非奇异)的作用,从而提供了无穷多个新的不变量来区分弱混合作用。我们将这些性质称为(本质上)$k$-链式性质,其中 $k \in \mathbb{N}$。我们应用这一框架来研究有限秩 $r \ge 1$ 自由群的边界作用,其中边界配备平稳马尔可夫测度。我们证明在此背景下,弱混合等价于 $(2r-1)$-链式性质,也等价于马尔可夫测度转移矩阵的严格不可约性。

英文摘要

We introduce a one-parameter family of notions between double ergodicity and metric ergodicity for measure-class preserving (i.e., nonsingular) actions of countable groups on standard probability spaces, providing infinitely many new invariants distinguishing weakly mixing actions. We call these properties (essentially) $k$-chaining, for $k \in \mathbb{N}$. We apply this framework to study boundary actions of free groups of finite rank $r \ge 1$, where the boundary is equipped with a stationary Markov measure. We prove that in this context, weak mixing is equivalent to $(2r-1)$-chaining, as well as to strict irreducibility of the transition matrix of the Markov measure.

发表机构

  • McGill University(麦吉尔大学)
  • Amherst College(阿默斯特学院)

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