The Furstenberg–Poisson boundary and CAT(0) cube complexes
The Furstenberg–Poisson boundary and CAT(0) cube complexes
复制标题
Furstenberg-Poisson 边界和 CAT(0) 立方体复合体
DOI:
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发表时间:
2015
影响因子:
0.9
通讯作者:
Talia Fernós
中科院分区:
文献类型:
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作者:
Talia Fernós
We show under weak hypotheses that $unicode[STIX]{x2202}X$ , 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 $unicode[STIX]{x1D6E4}$ . In particular, we show that if $unicode[STIX]{x1D6E4}$ admits a non-elementary proper action on $X$ , and $unicode[STIX]{x1D707}$ is a generating probability measure of finite entropy and finite first logarithmic moment, then there is a $unicode[STIX]{x1D707}$ -stationary measure on $unicode[STIX]{x2202}X$ making it the Furstenberg–Poisson boundary for the $unicode[STIX]{x1D707}$ -random walk on $unicode[STIX]{x1D6E4}$ . We also show that the support is contained in the closure of the regular points. Regular points exhibit strong contracting properties.