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arXiv 2312.06910math.NAcs.NAmath.PR
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一类带跳随机微分方程自适应数值方法的强收敛性

Strong convergence of a class of adaptive numerical methods for SDEs with jumps

Cónall Kelly, Gabriel Lord, Fandi Sun

AI总结:

本文针对带 Poisson 跳跃的非线性随机微分方程,提出将跳跃时间纳入自适应步长策略的跳跃适配网格方法,并证明满足均方相容性界的自适应格式在跳跃与扩散独立且跳跃系数满足全局 Lipschitz 条件时可实现强收敛。

摘要:

我们针对具有跳跃扰动的 Itô 型随机微分方程(SDE)提出自适应时间步进策略。该方法建立在适用于 SDE 的自适应策略基础之上。自适应方法通过在每个轨迹上动态调整步长,能够保证漂移项和扩散项系数违反全局 Lipschitz 条件的非线性 SDE 的强收敛性,从而防止可能以足够高概率出现并导致收敛性丧失的虚假增长。本文展示了将跳跃时间纳入自适应时间步进策略的跳跃适配网格的使用。我们证明,对于非跳跃情形下的非线性 SDE,任何满足特定均方相容性界的自适应格式都可以推广为 Poisson 跳跃情形下的强收敛格式,其中跳跃扰动与扩散扰动相互独立,且跳跃系数满足全局 Lipschitz 条件。

英文摘要:

We develop adaptive time-stepping strategies for Itô-type stochastic differential equations (SDEs) with jump perturbations. Our approach builds on adaptive strategies for SDEs. Adaptive methods can ensure strong convergence of nonlinear SDEs with drift and diffusion coefficients that violate global Lipschitz bounds by adjusting the stepsize dynamically on each trajectory to prevent spurious growth that can lead to loss of convergence if it occurs with sufficiently high probability. In this article we demonstrate the use of a jump-adapted mesh that incorporates jump times into the adaptive time-stepping strategy. We prove that any adaptive scheme satisfying a particular mean-square consistency bound for a nonlinear SDE in the non-jump case may be extended to a strongly convergent scheme in the Poisson jump case where jump and diffusion perturbations are mutually independent and the jump coefficient satisfies a global Lipschitz condition.

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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