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arXiv 1507.05511math.GRmath.DSmath.GT
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Furstenberg Poisson边界与CAT(0)立方复形

The Furstenberg Poisson Boundary and CAT(0) Cube Complexes

Talia Fernós

摘要:

在弱假设下证明了有限维CAT(0)立方体复形$X$的Roller边界$\partial X$是作用群$Γ$上充分好随机游动的Furstenberg-Poisson边界.特别地,我们证明了,如果$Γ$允许$X$上的非初等真作用,并且$μ$是有限熵和有限第一对数矩的生成概率测度,则在$\partial X$上存在$μ$ -平稳测度,使得它成为$Γ$上$μ$ -随机游动的Furstenberg-Poisson边界。我们还证明了支撑包含在正则点的闭包中。正则点具有强收缩性质。

英文摘要:

We show under weak hypotheses that $\partial X$, the Roller boundary of a finite dimensional CAT(0) cube complex $X$ is the Furstenberg-Poisson boundary of a sufficiently nice random walk on an acting group $Γ$. In particular, we show that if $Γ$ admits a nonelementary proper action on $X$, and $μ$ is a generating probability measure of finite entropy and finite first logarithmic moment, then there is a $μ$-stationary measure on $\partial X$ making it the Furstenberg-Poisson boundary for the $μ$-random walk on $Γ$. We also show that the support is contained in the closure of the regular points. Regular points exhibit strong contracting properties.

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