arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1401.5502math.PR
收藏

光滑布朗鞅的一个表示定理--新例

A Representation Theorem for Smooth Brownian Martingales - New Example

Sixian Jin, Qidi Peng, Henry Schellhorn

摘要:

我们证明了,在一定的光滑条件下,布朗鞅,当在一个固定的时间评估,可以表示通过一个指数公式在稍后的时间。该指数算子的时间相关生成元仅依赖于沿“冻结路径”求值的二阶Malliavin导数算子。指数算符可以显式地扩展为级数表示,类似于量子力学的戴森级数。我们的连续时间鞅表示结果可以用两种不同的方法独立地证明。在第一种方法中,构造一个时间发展方程,通过一个近似离散时间鞅的向后泰勒展开的特殊情况的极限。指数公式是时间-发展方程的一个解,但我们在文中强调时间-发展方程是一个独立的结果。在第二种方法中,我们只在这篇文章中强调,我们使用指数函数的稠密性的性质。我们提供了几个应用的指数公式,并简要强调向后泰勒展开的数值应用。

英文摘要:

We show that, under certain smoothness conditions, a Brownian martingale, when evaluated at a fixed time, can be represented via an exponential formula at a later time. The time-dependent generator of this exponential operator only depends on the second order Malliavin derivative operator evaluated along a "frozen path". The exponential operator can be expanded explicitly to a series representation, which resembles the Dyson series of quantum mechanics. Our continuous-time martingale representation result can be proven independently by two different methods. In the first method, one constructs a time-evolution equation, by passage to the limit of a special case of a backward Taylor expansion of an approximating discrete time martingale. The exponential formula is a solution of the time-evolution equation, but we emphasize in our article that the time-evolution equation is a separate result of independent interest. In the second method, which we only highlight in this article, we use the property of denseness of exponential functions. We provide several applications of the exponential formula, and briefly highlight numerical applications of the backward Taylor expansion.

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。

↑