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arXiv 0712.1867math.PR
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泊松匹配

Poisson Matching

Alexander E. Holroyd, Robin Pemantle, Yuval Peres, Oded Schramm

摘要:

假设红点和蓝点作为独立的齐次泊松过程出现在R^d中。我们研究了完美匹配红点蓝点的投影不变方案。对于维数d= 1,2的任何这样的方案,从一个典型点到它的伙伴的匹配距离X必须有无限的d/2阶矩,而在维数d>=3的方案中存在X有有限的指数矩。Gale-Shapley稳定婚姻是一种自然匹配方案,通过迭代匹配相互最接近的对而获得。本文的一个主要结果是该方案的匹配距离X的幂律上界。幂律下界也成立。特别是,稳定的婚姻在d=1时接近最优(尾部行为),但在d>=3时远非最优。对于单色Poisson点的匹配问题,在d=1时,存在X具有有限指数矩的方案,但如果我们坚持匹配是点过程的决定性因素,则X必须具有无穷均值.

英文摘要:

Suppose that red and blue points occur as independent homogeneous Poisson processes in R^d. We investigate translation-invariant schemes for perfectly matching the red points to the blue points. For any such scheme in dimensions d=1,2, the matching distance X from a typical point to its partner must have infinite d/2-th moment, while in dimensions d>=3 there exist schemes where X has finite exponential moments. The Gale-Shapley stable marriage is one natural matching scheme, obtained by iteratively matching mutually closest pairs. A principal result of this paper is a power law upper bound on the matching distance X for this scheme. A power law lower bound holds also. In particular, stable marriage is close to optimal (in tail behavior) in d=1, but far from optimal in d>=3. For the problem of matching Poisson points of a single color to each other, in d=1 there exist schemes where X has finite exponential moments, but if we insist that the matching is a deterministic factor of the point process then X must have infinite mean.

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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