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arXiv 2103.00338math.PR
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圆柱区域中朗之万过程的拟平稳分布,第II部分:过阻尼极限

Quasi-stationary distribution for the Langevin process in cylindrical domains, part II: overdamped limit

Mouad Ramil

摘要:

考虑朗之万过程,用$\mathbb{R}^{d}\times\mathbb{R}^d$中的向量(位置和动量)描述。设$\mathcal O$是$\mathbb{R}^d$的一个开有界连通集$\mathcal{C}^2$.最近的工作表明,存在一个唯一的准平稳分布(QSD)的区域$D:=\mathcal{O}\times\mathbb{R}^d$上的朗之万过程。在本文中,我们研究了这种QSD的过阻尼极限,即当摩擦系数趋于无穷大时。特别地,我们证明了过阻尼极限位置的边际律是区域$\mathcal{O}$上过阻尼Langevin过程的QSD。

英文摘要:

Consider the Langevin process, described by a vector (positions and momenta) in $\mathbb{R}^{d}\times\mathbb{R}^d$. Let $\mathcal O$ be a $\mathcal{C}^2$ open bounded and connected set of $\mathbb{R}^d$. Recent works showed the existence of a unique quasi-stationary distribution (QSD) of the Langevin process on the domain $D:=\mathcal{O}\times\mathbb{R}^d$. In this article, we study the overdamped limit of this QSD, i.e. when the friction coefficient goes to infinity. In particular, we show that the marginal law in position of the overdamped limit is the QSD of the overdamped Langevin process on the domain $\mathcal{O}$.

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