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arXiv 1802.06010math.PR
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具有径向漂移的布朗流的命中概率

Hitting Probabilities of a Brownian flow with Radial Drift

Jong Jun Lee, Carl Mueller, Eyal Neuman

摘要:

我们考虑一个随机流$ϕ_t(x,ω)$在$\mathbb{R}^n$与初始点$ϕ_0(x,ω)=x$,由一个单一的$n$维布朗运动,并与一个向外的径向漂移的幅度$\frac{ F(\|ϕ_t(x)\|)}{\|ϕ_t(x)\|}$,与$F$非负,有界和Lipschitz。我们考虑初始点$x$位于一组正距离的原点。我们表明,存在常数$C^*,c^*>0$不依赖于$n$,这样,如果$F>C^*n$,那么在流的初始集的图像有概率0击中原点。如果$0\leq F \leq c^*n^{3/4}$,并且如果初始集合具有非空内部,则集合的像具有正概率击中原点。

英文摘要:

We consider a stochastic flow $ϕ_t(x,ω)$ in $\mathbb{R}^n$ with initial point $ϕ_0(x,ω)=x$, driven by a single $n$-dimensional Brownian motion, and with an outward radial drift of magnitude $\frac{ F(\|ϕ_t(x)\|)}{\|ϕ_t(x)\|}$, with $F$ nonnegative, bounded and Lipschitz. We consider initial points $x$ lying in a set of positive distance from the origin. We show that there exist constants $C^*,c^*>0$ not depending on $n$, such that if $F>C^*n$ then the image of the initial set under the flow has probability 0 of hitting the origin. If $0\leq F \leq c^*n^{3/4}$, and if the initial set has nonempty interior, then the image of the set has positive probability of hitting the origin.

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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