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arXiv 2006.14892math.PRcs.NAmath.NA
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具有不连续漂移的一维McKean-Vlasov方程与相互作用粒子系统的适定性与数值格式

Well-posedness and numerical schemes for one-dimensional McKean-Vlasov equations and interacting particle systems with discontinuous drift

Gunther Leobacher, Christoph Reisinger, Wolfgang Stockinger

AI总结:

本文研究一维McKean-Vlasov SDE及其粒子系统在不连续漂移下的适定性,并分析Euler-Maruyama型格式的强收敛性,揭示不连续漂移导致经典1/2阶收敛率无法普遍成立。

摘要:

本文首先建立了一维McKean-Vlasov随机微分方程(SDE)及相关粒子系统的适定性结果,其中漂移系数依赖于测度且在空间分量上不连续,扩散系数仅为状态的Lipschitz函数。我们仅对扩散系数施加相当温和的条件,即要求其在漂移的不连续点处非零,同时需要对漂移的测度依赖性施加一定的结构性假设。其次,我们研究粒子系统的Euler-Maruyama型格式,用以逼近一维McKean-Vlasov SDE的解。在此,我们将证明关于时间步数和粒子数的强收敛结果。由于漂移的不连续性,收敛分析是非标准的,且Lipschitz情形下已知的通常强收敛阶$1/2$无法对所有格式都得到恢复。

英文摘要:

In this paper, we first establish well-posedness results for one-dimensional McKean-Vlasov stochastic differential equations (SDEs) and related particle systems with a measure-dependent drift coefficient that is discontinuous in the spatial component, and a diffusion coefficient which is a Lipschitz function of the state only. We only require a fairly mild condition on the diffusion coefficient, namely to be non-zero in a point of discontinuity of the drift, while we need to impose certain structural assumptions on the measure-dependence of the drift. Second, we study Euler-Maruyama type schemes for the particle system to approximate the solution of the one-dimensional McKean-Vlasov SDE. Here, we will prove strong convergence results in terms of the number of time-steps and number of particles. Due to the discontinuity of the drift, the convergence analysis is non-standard and the usual strong convergence order $1/2$ known for the Lipschitz case cannot be recovered for all schemes.

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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