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arXiv 0710.4259math.PR
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具有矩退化扩散的Langevin过程的遍历性

Ergodicity of Langevin Processes with Degenerate Diffusion in Momentums

Nawaf Bou-Rabee, Houman Owhadi

摘要:

本文介绍了一种证明退化噪声驱动随机过程遍历性的几何方法。驱动噪声被假定为具有非退化扩散分量的任意Levy过程(但这可以应用于系统的单个自由度)。几何条件是该过程的近似可控性,即在相空间中存在一个点,在该点处,经由驱动噪声的二次随机化版本的点的图像的内部是非空的。本文应用该方法证明了由Langevin型方程控制的滑动圆盘(一个简单的随机刚体系统)的遍历性。本文表明,这个朗之万过程的一个关键特征是,即使与动量相关的扩散和漂移矩阵是简并的,系统仍然处于均匀的温度。

英文摘要:

This paper introduces a geometric method for proving ergodicity of degenerate noise driven stochastic processes. The driving noise is assumed to be an arbitrary Levy process with non-degenerate diffusion component (but that may be applied to a single degree of freedom of the system). The geometric conditions are the approximate controllability of the process the fact that there exists a point in the phase space where the interior of the image of a point via a secondarily randomized version of the driving noise is non void. The paper applies the method to prove ergodicity of a sliding disk governed by Langevin-type equations (a simple stochastic rigid body system). The paper shows that a key feature of this Langevin process is that even though the diffusion and drift matrices associated to the momentums are degenerate, the system is still at uniform temperature.

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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