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arXiv 2004.05825math.PR
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正倒向随机Volterra积分方程的路径依赖Feynman-Kac公式

Path Dependent Feynman-Kac Formula for Forward Backward Stochastic Volterra Integral Equations

Hanxiao Wang, Jiongmin Yong, Jianfeng Zhang

摘要:

研究了正倒向随机Volterra积分方程(简称FBSVIEs)与(时间非局部的)路径依赖偏微分方程(简称PPDE)之间的关系.由于Volterra型方程的性质,通常的流性质(或半群性质)不成立。受Viens-Zhang \cite{Viens-Zhang-2019}和Wang-Yong \cite{Wang-Yong-2019}的启发,引入了辅助过程,使FBSVIE自适应解的流动性质在适当的意义下得到恢复,从而使泛函伊藤公式适用.在实现该阶段之后,找到自然的PPDE,使得后向SVIE的适应解允许根据前向SVIE的解经由PPDE的解的表示。另一方面,PPDE的解决方案承认的适应解决方案(路径依赖)FBSVIE,这是被称为费曼-卡茨公式的一个表示。这导致了一个经典解的PPDE的存在性和唯一性,光滑条件下的FBSVIE的系数。进一步地,当光滑性条件放宽且FBSVIE的后向分量为一维时,引入了一个新的(合适的)PPDE粘性解的概念,建立了PPDE的黏性解的比较原理,从而得到了PPDE的黏性解的唯一性.最后,将已有的结果推广到耦合FBSVIE和II型BSVIE,并通过对线性FBSVIE的深入研究,得到了PPDE解的路径导数的表达式.

英文摘要:

This paper is concerned with the relationship between forward-backward stochastic Volterra integral equations (FBSVIEs, for short) and a system of (non-local in time) path dependent partial differential equations (PPDEs, for short). Due to the nature of Volterra type equations, the usual flow property (or semigroup property) does not hold. Inspired by Viens-Zhang \cite{Viens-Zhang-2019} and Wang-Yong \cite{Wang-Yong-2019}, auxiliary processes are introduced so that the flow property of adapted solutions to the FBSVIEs is recovered in a suitable sense, and thus the functional Itô's formula is applicable. Having achieved this stage, a natural PPDE is found so that the adapted solution of the backward SVIEs admits a representation in terms of the solution to the forward SVIE via the solution to a PPDE. On the other hand, the solution of the PPDE admits a representation in terms of adapted solution to the (path dependent) FBSVIE, which is referred to as a Feynman-Kac formula. This leads to the existence and uniqueness of a classical solution to the PPDE, under smoothness conditions on the coefficients of the FBSVIEs. Further, when the smoothness conditions are relaxed with the backward component of FBSVIE being one-dimensional, a new (and suitable) notion of viscosity solution is introduced for the PPDE, for which a comparison principle of the viscosity solutions is established, leading to the uniqueness of the viscosity solution. Finally, some results have been extended to coupled FBSVIEs and type-II BSVIEs, and a representation formula for the path derivatives of PPDE solution is obtained by a closer investigation of linear FBSVIEs.

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