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arXiv 1209.0401math.PR
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高维随机wave equation:Malliavin可微性和绝对连续性

The stochastic wave equation in high dimensions: Malliavin differentiability and absolute continuity

Marta Sanz-Solé, André Süß

摘要:

我们考虑一类在\cite{conusdalang}中研究的非线性随机偏微分方程。建立了圆柱布朗运动积分和Skorohod积分的等价公式。证明了这些方程在任意不动点$(t,x)\in[0,T]\times \Rd$的随机场解在Malliavin意义下是可微的。为此,将\cite{conusdalang}中的积分理论推广到希尔伯特空间值被积函数,并证明了Malliavin导数与随机积分和路径积分的交换公式.在加性噪声方程的特殊情况下,我们建立了在$(t,x)\in]0,T]\times\Rd$上解的密度律的存在性。所得结果适用于空间维随机波动方程$d\ge 4$。

英文摘要:

We consider the class of non-linear stochastic partial differential equations studied in \cite{conusdalang}. Equivalent formulations using integration with respect to a cylindrical Brownian motion and also the Skorohod integral are established. It is proved that the random field solution to these equations at any fixed point $(t,x)\in[0,T]\times \Rd$ is differentiable in the Malliavin sense. For this, an extension of the integration theory in \cite{conusdalang} to Hilbert space valued integrands is developed, and commutation formulae of the Malliavin derivative and stochastic and pathwise integrals are proved. In the particular case of equations with additive noise, we establish the existence of density for the law of the solution at $(t,x)\in]0,T]\times\Rd$. The results apply to the stochastic wave equation in spatial dimension $d\ge 4$.

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