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arXiv 1302.2678math.PR
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多维粘性布朗运动作为排斥过程的极限

Multidimensional sticky Brownian motions as limits of exclusion processes

Miklós Z. Rácz, Mykhaylo Shkolnikov

摘要:

我们研究了整数格点上的排斥过程,其中粒子由于粘性而改变其速度。具体地说,每当两个或更多的粒子占据相邻的位置时,它们就会粘在一起一段时间,整个粒子系统就会减慢速度,直到“碰撞”解决。我们表明,在扩散缩放的空间和时间,这样的过程收敛到什么可以被称为粘性反映布朗运动的楔形。后者在楔形体内部表现为具有常数漂移矢量和扩散矩阵的布朗运动,并在楔形体的边界处停留一瞬间后反射。特别是,这导致了一个自然的多维推广的粘性布朗运动的半线,这是感兴趣的排队论和随机投资组合理论。例如,这可以对一个市场进行建模,该市场由于重大事件(例如市场上一些最大的公司之间的法庭审判)决定了新的市场领导者而经历了放缓。

英文摘要:

We study exclusion processes on the integer lattice in which particles change their velocities due to stickiness. Specifically, whenever two or more particles occupy adjacent sites, they stick together for an extended period of time, and the entire particle system is slowed down until the ``collision'' is resolved. We show that under diffusive scaling of space and time such processes converge to what one might refer to as a sticky reflected Brownian motion in the wedge. The latter behaves as a Brownian motion with constant drift vector and diffusion matrix in the interior of the wedge, and reflects at the boundary of the wedge after spending an instant of time there. In particular, this leads to a natural multidimensional generalization of sticky Brownian motion on the half-line, which is of interest in both queuing theory and stochastic portfolio theory. For instance, this can model a market, which experiences a slowdown due to a major event (such as a court trial between some of the largest firms in the market) deciding about the new market leader.

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