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arXiv 2006.06808math.PRmath-phmath.DSmath.MP
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朗之万动力学不变测度的极限行为

Limit behavior of the invariant measure for Langevin dynamics

Gerardo Barrera

AI总结:

本文研究小振幅乘性布朗噪声驱动的过阻尼朗之万动力学的不变测度,证明当噪声强度趋于零时,缩放后的不变测度在p-Wasserstein距离下收敛于满足Lyapunov方程的高斯测度并估计了误差,弥补了不变测度无显式表达式的研究局限。

摘要:

本文研究$\u211d^d$上带有过阻尼向量场、由小振幅$\u221aε$($ε>0$)乘性布朗噪声驱动的朗之万动力学。在对向量场和扩散系数的适当假设下,已知该系统存在唯一不变概率测度$μ^ε$。当$ε$趋于零时,我们证明概率测度$ε^{d/2} μ^ε(\u221aε\u2109 x)$在$p$-Wasserstein距离($p\in [1,2]$)下收敛于一个零均值向量、非退化协方差矩阵的高斯测度,该协方差矩阵满足Lyapunov矩阵方程。此外,我们还估计了误差项。需要强调的是,通常情况下无法得到$μ^ε$的显式表达式。

英文摘要:

In this manuscript, we consider the Langevin dynamics on $\mathbb{R}^d$ with an overdamped vector field and driven by multiplicative Brownian noise of small amplitude $\sqrtε$, $ε>0$. Under suitable assumptions on the vector field and the diffusion coefficient, it is well-known that it possesses a unique invariant probability measure $μ^ε$. As $ε$ tends to zero, we prove that the probability measure $ε^{d/2} μ^ε(\sqrtε\mathrm{d} x)$ converges in the $p$-Wasserstein distance for $p\in [1,2]$ to a Gaussian measure with zero-mean vector and non-degenerate covariance matrix which solves a Lyapunov matrix equation. Moreover, the error term is estimated. We emphasize that generically no explicit formula for $μ^ε$ can be found.

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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