论文标题

用于覆盖非交通噪声情况的SPDE的无衍生米尔斯坦类型近似方法

A Derivative-Free Milstein Type Approximation Method for SPDEs covering the Non-Commutative Noise case

论文作者

von Hallern, Claudine, Rößler, Andreas

论文摘要

不具有交换噪声的随机部分微分方程的高阶方案需要模拟迭代的随机积分。在这项工作中,我们提出了一种无衍生的米尔斯坦类型方案,以近似于随机部分微分方程的轻度解,该方程不需要满足噪声项的通勤条件,并且可以将涉及的迭代积分的某些近似方法灵活地结合在一起。最近,作者引入了两种算法,以模拟这种迭代的随机积分。这些清除了实施拟议的高阶计划的方式。我们证明了引入的无衍生物米尔斯坦类型方案的平均值收敛性,该方案达到了与原始米尔斯坦方案相同的顺序。但是,当考虑到有效的收敛顺序时,原始方案肯定会优于计算成本。在应用迭代随机积分近似的最近提出的算法之一的情况下,我们分析了无衍生物米尔斯坦类型方案的收敛顺序。与指数的Euler方案和原始米尔斯坦方案相比,提出的无衍生物米尔斯坦类型方案至少具有相同的相同,在大多数情况下,甚至根据所考虑的特定SPDE,甚至更高的有效收敛顺序。通过数值模拟说明并确认了这些分析结果。

Higher order schemes for stochastic partial differential equations that do not possess commutative noise require the simulation of iterated stochastic integrals. In this work, we propose a derivative-free Milstein type scheme to approximate the mild solution of stochastic partial differential equations that need not to fulfill a commutativity condition for the noise term and which can flexibly be combined with some approximation method for the involved iterated integrals. Recently, the authors introduced two algorithms to simulate such iterated stochastic integrals; these clear the way for the implementation of the proposed higher order scheme. We prove the mean-square convergence of the introduced derivative-free Milstein type scheme which attains the same order as the original Milstein scheme. The original scheme, however, is definitely outperformed when the computational cost is taken into account additionally, that is, in terms of the effective order of convergence. We derive the effective order of convergence for the derivative-free Milstein type scheme analytically in the case that one of the recently proposed algorithms for the approximation of the iterated stochastic integrals is applied. Compared to the exponential Euler scheme and the original Milstein scheme, the proposed derivative-free Milstein type scheme possesses at least the same and in most cases even a higher effective order of convergence depending on the particular SPDE under consideration. These analytical results are illustrated and confirmed with numerical simulations.

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