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arXiv math/0211455math.PR
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点过程的树和匹配

Trees and matchings from point processes

Alexander E. Holroyd, Yuval Peres

摘要:

点过程的因子图是以过程的点为顶点的图,它是由过程以确定性等距不变的方式构造的。证明了d维泊松过程有一棵单端树作为因子图。这意味着泊松点可以以确定性等距不变的方式给出与整数的通常排序同构的排序。对于d \geq 4,我们的结果回答了Ferrari,Landim和Thorisson提出的一个问题。我们还证明了在欧氏空间或双曲空间中,任何有限强度的等距不变遍历点过程,只要点间距离不同,都有作为因子图的完美匹配.

英文摘要:

A factor graph of a point process is a graph whose vertices are the points of the process, and which is constructed from the process in a deterministic isometry-invariant way. We prove that the d-dimensional Poisson process has a one-ended tree as a factor graph. This implies that the Poisson points can be given an ordering isomorphic to the usual ordering of the integers in a deterministic isometry-invariant way. For d \geq 4 our result answers a question posed by Ferrari, Landim and Thorisson. We prove also that any isometry-invariant ergodic point process of finite intensity in Euclidean or hyperbolic space has a perfect matching as a factor graph provided all the inter-point distances are distinct.

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