We discuss a class of Backward Stochastic Differential Equations(BSDEs) with no driving martingale. When the randomness of the driver depends on a general Markov process $X$, those BSDEs are denominated Markovian BSDEs and can be associated to a deterministic problem,called Pseudo-PDE which constitute the natural generalization of a parabolicsemilinear PDE which naturally appears when the underlying filtration is Brownian. We consider two aspects of well-posedness forthe Pseudo-PDEs: "classical" and "martingale" solutions.
Martingale representations for diffusion processes and backward stochastic differential equations
本文证明了连续Hunt过程的自然滤子是连续的,并证明了在这种滤子上的鞅是连续的。在一定的技术条件下,我们进一步建立了一类连续Hunt过程的鞅表示定理。特别地,我们建立了具有连续边界的有界区域中(反射)对称扩散的鞅部分的鞅表示定理。结合Lyons et al(2009)提出的方法,我们的鞅表示定理被应用于研究拟线性抛物方程的初边值问题,通过在一个只有连续边界的有界区域中反射扩散所确定的过滤概率空间上使用倒向随机微分方程的解.
In this paper, we present martingale decomposition on time scales. We establish the related backward stochastic dynamic equations on time scales (this paper BS$\nabla$E for short, concerning $\nabla$-integral on time scales) which unify backward stochastic differential equations and backward stochastic difference equations. We prove the existence and uniqueness theorem of BS$\nabla$E. This work can be considered as a unification and a generalization of similar results in backward stochastic difference equations and backward stochastic differential equations.
Results on the existence, uniqueness and strict comparison for solutions to a BSDE driven by a multi-dimensional RCLL martingale are established. The goal is to develop a general multi-asset framework encompassing a wide spectrum of nonlinear financial models with jumps, including as particular cases the setups studied by Peng and Xu \cite{PX2009,PX2010} and Dumitrescu et al. \cite{DGQS2018} who dealt with BSDEs driven by a one-dimensional Brownian motion and a purely discontinuous martingale with a single jump.
In this paper, we establish an analytic framework for studying set-valued backward stochastic differential equations (set-valued BSDE), motivated largely by the current studies of dynamic set-valued risk measures for multi-asset or network-based financial models. Our framework will make use of the notion of Hukuhara difference between sets, in order to compensate the lack of "inverse" operation of the traditional Minkowski addition, whence the vector space structure in set-valued analysis. While proving the well-posedness of a class of set-valued BSDEs, we shall also address some fundamental i…
We study a stochastic optimal control problem for forward-backward control systems with quadratic generators. In order to establish the first and second-order variational and adjoint equations, we obtain a new estimate for one-dimensional linear BSDEs with unbounded stochastic Lipschitz coefficients involving bounded mean oscillation martingales (BMO-martingales for short) and prove the solvability for a class of multi-dimensional BSDEs with this type. Finally, a new global stochastic maximum principle is deduced.
A Representation Theorem for Smooth Brownian Martingales
我们证明了,在一定的光滑条件下,布朗鞅在一个固定的时间可以表示为指数的值在以后的时间。这个指数算子的时间相关生成元等于Malliavin导数的二分之一。这个结果也可以看作是抛物型偏微分方程的群论到由Dupire(2009)和Cont and Founié(2011)引入的抛物型路径依赖的偏微分方程的推广。指数算符可以在级数展开中显式计算,这类似于量子力学的戴森级数。我们的连续时间鞅表示结果证明了一个通道的一个特殊情况下的一个近似离散时间鞅的向后泰勒展开的极限。后一种展开式也可用于数值计算。
Càdlàg Solutions to Backward Stochastic Dynamics featuring Oblique Subgradients and driven by Martingale Noise
Simion Stoilow Institute of Mathematics of the Romanian Academy(罗马尼亚科学院西奥多·斯泰洛尤数学研究所);Faculty of Mathematics, ”Alexandru Ioan Cuza” University of Iaşi(雅西亚历山德鲁·约安·库扎大学数学系);Octav Mayer Institute of Mathematics of the Romanian Academy, Iaşi branch(罗马尼亚科学院奥克塔夫·梅耶数学研究所雅西分部)
Let $(\mathbb{P}^{s,x})_{(s,x)\in[0,T]\times E}$ be a family of probability measures, where $E$ is a Polish space,defined on the canonical probability space ${\mathbb D}([0,T],E)$ of $E$-valued cadlag functions. We suppose that a martingale problem with respect to a time-inhomogeneous generator $a$ is well-posed. We consider also an associated semilinear {\it Pseudo-PDE} with generator $a$ for which we introduce a notion of so called {\it decoupled mild} solution and study the equivalence with the notion of martingale solution introduced in a companion paper. We also investigate well-posedness…