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arXiv 0909.1425math.DS
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Poisson-Pinsker因子与保无限测度的群作用

Poisson-Pinsker factor and infinite measure preserving group actions

Emmanuel Roy

摘要:

通过证明以下二分法,解决了可数顺从群的保守遍历无穷测度保持作用的Poisson-Pinsker因子的存在性问题:要么它具有全正Poisson熵(且为零型),要么它具有Poisson-Pinsker因子.如果G是阿贝尔的且熵为正,则在第一种情况下,谱在整个L^{2}-空间上是绝对连续的(如果G= \mathbb{Z},则谱是勒贝格可数的),在第二种情况下,谱在泊松-平斯克因子的L^{2}-空间的正交补中是绝对连续的。

英文摘要:

We solve the question of the existence of a Poisson-Pinsker factor for conservative ergodic infinite measure preserving action of a countable amenable group by proving the following dichotomy: either it has totally positive Poisson entropy (and is of zero type), or it possesses a Poisson-Pinsker factor. If G is abelian and the entropy positive, the spectrum is absolutely continuous (Lebesgue countable if G=\mathbb{Z}) on the whole L^{2}-space in the first case and in the orthocomplement of the L^{2}-space of the Poisson-Pinsker factor in the second.

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