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arXiv 1209.0576math.PR
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一维扩散及其Euler格式间的路径最优输运界

Pathwise optimal transport bounds between a one-dimensional diffusion and its Euler scheme

A. Alfonsi, B. Jourdain, A. Kohatsu-Higa

摘要:

本文证明了在具有上确界范数的连续样本路径空间上,一维一致椭圆扩散过程的律与其Euler离散化的$N$步之间的Wasserstein距离小于$O(N^{-2/3+\varepsilon})$,其中$\varepsilon$为任意正常数.该速率介于当将随机微分方程和具有相同布朗运动的欧拉方案耦合时获得的$O(N^{-1/2})$中的强误差估计与当比较在终端时间$T$的相同扩散函数和欧拉方案的期望时获得的弱误差估计$O(N^{-1})$之间。我们还检查,在$t\in[0,T]$上的上确界的Wasserstein距离的空间上的概率措施之间的法律的扩散在时间$t$和欧拉计划在时间$t$的行为像$O(\sqrt{\log(N)}N^{-1})$的实线。

英文摘要:

In the present paper, we prove that the Wasserstein distance on the space of continuous sample-paths equipped with the supremum norm between the laws of a uniformly elliptic one-dimensional diffusion process and its Euler discretization with $N$ steps is smaller than $O(N^{-2/3+\varepsilon})$ where $\varepsilon$ is an arbitrary positive constant. This rate is intermediate between the strong error estimation in $O(N^{-1/2})$ obtained when coupling the stochastic differential equation and the Euler scheme with the same Brownian motion and the weak error estimation $O(N^{-1})$ obtained when comparing the expectations of the same function of the diffusion and of the Euler scheme at the terminal time $T$. We also check that the supremum over $t\in[0,T]$ of the Wasserstein distance on the space of probability measures on the real line between the laws of the diffusion at time $t$ and the Euler scheme at time $t$ behaves like $O(\sqrt{\log(N)}N^{-1})$.

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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