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arXiv 2009.12937math.PR
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反射布朗运动的无扰动局部收敛与扰动

Dimension-free local convergence and perturbations for reflected Brownian motions

Sayan Banerjee, Brendan Brown

摘要:

我们描述和分析了一类正的经常性反射布朗运动(RBM)在$\mathbb{R}^d_+$的本地统计收敛到平衡的速度无关的维度$d$。在适当的假设下的反射矩阵,漂移和扩散系数,维数无关的拉伸指数收敛速度得到估计收缩之间的同步耦合RBM的潜在加权距离。我们还研究了对称阿特拉斯模型作为第一步,在获得维数无关的收敛速度RBM不满足上述假设。通过分析一个路径导数过程,并将其与随机环境中的随机游动联系起来,得到了对称Atlas模型间隙过程在适当的平稳性扰动下的多项式收敛速度.

英文摘要:

We describe and analyze a class of positive recurrent reflected Brownian motions (RBMs) in $\mathbb{R}^d_+$ for which local statistics converge to equilibrium at a rate independent of the dimension $d$. Under suitable assumptions on the reflection matrix, drift and diffusivity coefficients, dimension-independent stretched exponential convergence rates are obtained by estimating contractions in an underlying weighted distance between synchronously coupled RBMs. We also study the Symmetric Atlas model as a first step in obtaining dimension-independent convergence rates for RBMs not satisfying the above assumptions. By analyzing a pathwise derivative process and connecting it to a random walk in a random environment, we obtain polynomial convergence rates for the gap process of the Symmetric Atlas model started from appropriate perturbations of stationarity.

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