通过几乎完全增长的一般作用不存在普遍的零熵系统

Pub Date : 2024-04-12 DOI:10.1017/etds.2024.24
GEORGII VEPREV
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引用次数: 0

摘要

我们证明,可数可合并群 G 的一般概率度量保留(p.m.p. )作用的缩放熵不能被给定的增长率所支配。作为推论,我们得到不存在一个 G 的拓扑作用,其遍历不变度量集合与熵为零的所有遍历 p.m.p. G 系统的集合重合。我们还证明了残差有限可调和群的泛函作用具有无法通过给定序列从下往上限定的缩放熵。此外,我们还展示了一个例子,说明可亲群的每个自由 p.m.p. 作用都有这样的下限。
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Non-existence of a universal zero-entropy system via generic actions of almost complete growth
We prove that a generic probability measure-preserving (p.m.p.) action of a countable amenable group G has scaling entropy that cannot be dominated by a given rate of growth. As a corollary, we obtain that there does not exist a topological action of G for which the set of ergodic invariant measures coincides with the set of all ergodic p.m.p. G-systems of entropy zero. We also prove that a generic action of a residually finite amenable group has scaling entropy that cannot be bounded from below by a given sequence. In addition, we show an example of an amenable group that has such a lower bound for every free p.m.p. action.
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