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arXiv 1303.6316math.NAcs.NAmath.PR
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乘性噪声随机微分方程的稳定数值格式

A stable numerical scheme for stochastic differential equations with multiplicative noise

Universidad de Concepción(康塞普西翁大学);Instituto de Cibernética, Matemática y Física(控制论、数学和物理研究所);Centro de Investigación en Matemática(数学研究中心)

C. M. Mora, H. A. Mardones, J. C. Jimenez, M. Selva, R. Biscay

AI总结:

提出方向和范数分解方法,通过耦合SDE系统近似解,设计出对刚性和乘性噪声问题稳定、保持几乎必然稳定性和远离零性质的显式格式,并具有弱收敛线性阶和强收敛半阶。

摘要:

我们引入了一种新的方法来设计随机微分方程(SDE)的数值格式。该方法称为方向和范数分解方法,通过积分描述$X_t$范数及其在单位球面上投影的耦合SDE系统来逼近所需解$X_t$。这使得我们能够为具有乘性噪声的刚性SDE开发一个显式格式,该格式在各种数值实验中表现出良好的性能。在一般条件下,新积分器对于任意步长保持解的几乎必然稳定性以及远离$0$的性质。该格式对于具有局部Lipschitz系数的一般SDE类具有弱收敛线性阶和强收敛半阶。

英文摘要:

We introduce a new approach for designing numerical schemes for stochastic differential equations (SDEs). The approach, which we have called direction and norm decomposition method, proposes to approximate the required solution $X_t$ by integrating the system of coupled SDEs that describes the evolution of the norm of $X_t$ and its projection on the unit sphere. This allows us to develop an explicit scheme for stiff SDEs with multiplicative noise that shows a solid performance in various numerical experiments. Under general conditions, the new integrator preserves the almost sure stability of the solutions for any step-size, as well as the property of being distant from $0$. The scheme also has linear rate of weak convergence for a general class of SDEs with locally Lipschitz coefficients,and one-half strong order of convergence.

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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