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arXiv 2210.13530math.NAcs.NAmath.PRstat.CO
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一种用于Zakai方程的高效蒙特卡洛方案

An efficient Monte Carlo scheme for Zakai equations

Christian Beck, Sebastian Becker, Patrick Cheridito, Arnulf Jentzen, Ariel Neufeld

AI总结:

本研究将Zakai随机偏微分方程转化为带随机系数的偏微分方程,结合Feynman–Kac公式提出高效蒙特卡洛求解方案,可在高达25维场景下快速得到良好结果。

摘要:

本文提出了一种在高维情形下高效近似求解特定Zakai方程的数值方法。核心思路是将给定的Zakai随机偏微分方程(SPDE)转化为带随机系数的偏微分方程(PDE)。我们证明,在对Zakai方程系数作出合适正则性假设的条件下,对应的随机偏微分方程存在解随机场:对于随机系数的几乎所有实现,该随机场均可表示为某线性抛物型偏微分方程的经典解。这使得我们能够应用Feynman–Kac公式,得到一种计算Zakai方程近似解的高效蒙特卡洛方案。该方法在高达25维的场景中取得了良好效果,且运行速度快。

英文摘要:

In this paper we develop a numerical method for efficiently approximating solutions of certain Zakai equations in high dimensions. The key idea is to transform a given Zakai SPDE into a PDE with random coefficients. We show that under suitable regularity assumptions on the coefficients of the Zakai equation, the corresponding random PDE admits a solution random field which, for almost all realizations of the random coefficients, can be written as a classical solution of a linear parabolic PDE. This makes it possible to apply the Feynman--Kac formula to obtain an efficient Monte Carlo scheme for computing approximate solutions of Zakai equations. The approach achieves good results in up to 25 dimensions with fast run times.

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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