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arXiv 1206.6789math.PR
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超布朗运动的矩密度及一类X-调和函数的Harnack估计

Moment densities of super-Brownian motion, and a Harnack estimate for a class of X-harmonic functions

Thomas S. Salisbury, A. Deniz Sezer

摘要:

本文给出了超布朗运动矩测度密度的一个比较不等式。这些密度递归定义为每个$n \ge 1$的泊松和格林的内核,因此可以使用经典的潜在理论的技术进行分析。当$n = 1$时,矩密度等于泊松核,比较简单,是经典的Harnack不等式。对于$n > 1$,我们发现比较不等式中的常数最多随$n$指数增长。我们将其应用于一类超布朗运动的$X$ -调和函数$H^ν$,Dynkin介绍。我们表明,对于a.e.该类中的$H^ν$,每个$μ$的$H^ν(μ)<\infty$。

英文摘要:

This paper features a comparison inequality for the densities of the moment measures of super-Brownian motion. These densities are defined recursively for each $n \ge 1$ in terms of the Poisson and Green's kernels, hence can be analyzed using the techniques of classical potential theory. When $n = 1$, the moment density is equal to the Poisson kernel, and the comparison is simply the classical inequality of Harnack. For $n > 1$ we find that the constant in the comparison inequality grows at most exponentially with $n$. We apply this to a class of $X$-harmonic functions $H^ν$ of super-Brownian motion, introduced by Dynkin. We show that for a.e. $H^ν$ in this class, $H^ν(μ)<\infty$ for every $μ$.

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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