论文标题
固定标记的点过程的极端行为
Extremal behavior of stationary marked point processes
论文作者
论文摘要
我们考虑欧几里得空间中点的固定配置,这些配置由称为分数的正随机变量标记。得分允许取决于其他点和外部随机性的相对位置。此类模型已在随机几何形状中进行了彻底研究,例如,在随机镶嵌或随机几何图的背景下。 事实证明,在一个极端分数的社区中,人们通常可以重新缩回位置和几个附近的点以获得限制点过程,我们称之为尾配置。根据分数之间依赖性的一些假设,该局部限制决定了在$ \ r^d $中增加窗口中极端分数的全局渐近学。主要结果确定了恢复的位置和高分群的融合到泊松群集过程中,从而量化了D. Aldous(在点过程设置)的泊松式启发式启发式的概念。与现有结果相反,我们的框架可以明确计算与极端行为相关的所有极端数量。 我们将结果应用于基于(标记的)泊松过程的模型,其中得分取决于与$ k $ th最近的邻居的距离,并允许分数根据其位置的随机网络传播。
We consider stationary configurations of points in Euclidean space which are marked by positive random variables called scores. The scores are allowed to depend on the relative positions of other points and outside sources of randomness. Such models have been thoroughly studied in stochastic geometry, e.g.\ in the context of random tessellations or random geometric graphs. It turns out that in a neighbourhood of a point with an extreme score one can often rescale positions and scores of nearby points to obtain a limiting point process, which we call the tail configuration. Under some assumptions on dependence between scores, this local limit determines the global asymptotics for extreme scores within increasing windows in $\R^d$. The main result establishes the convergence of rescaled positions and clusters of high scores to a Poisson cluster process, quantifying the idea of the Poisson clumping heuristic by D.~Aldous (in the point process setting). In contrast to the existing results, our framework allows for explicit calculation of essentially all extremal quantities related to the limiting behavior of extremes. We apply our results to models based on (marked) Poisson processes where the scores depend on the distance to the $k$th nearest neighbor and where scores are allowed to propagate through a random network of points depending on their locations.