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arXiv 0909.1092math.PR
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一般点过程的树因子和网格因子

Tree and grid factors of general point processes

Adam Timar

摘要:

研究了对称群几乎必然平凡的$\mathbb{R}^d$的同构不变点过程。我们定义了一个单端的,局部有限的树因子的点的过程,也就是说,一个映射的点配置到一个图上,它是可测量的和等变的点过程。这回答了Holroyd和Peres的一个问题。该树将用于构造同构于$\Z^n$的因子。这个也许令人惊讶的结果(任何$d$和$n$都能工作)解决了史蒂夫·埃文斯的一个问题。该构造基于在第$i$分区的每个簇中具有$2^i$顶点的连接聚集,可用于定义各种其它因子。

英文摘要:

We study isomorphism invariant point processes of $\mathbb{R}^d$ whose groups of symmetries are almost surely trivial. We define a 1-ended, locally finite tree factor on the points of the process, that is, a mapping of the point configuration to a graph on it that is measurable and equivariant with the point process. This answers a question of Holroyd and Peres. The tree will be used to construct a factor isomorphic to $\Z^n$. This perhaps surprising result (that any $d$ and $n$ works) solves a problem by Steve Evans. The construction, based on a connected clumping with $2^i$ vertices in each clump of the $i$'th partition, can be used to define various other factors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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