arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2210.01239math.PR
收藏

重排随机热方程

Rearranged Stochastic Heat Equation

François Delarue, William R. P. Hammersley

AI总结:

本文在概率测度空间上构造了一个强Feller半群,通过圆上受有色噪声驱动的重排随机热方程的Euler格式证明其可解性,并利用Bismut-Elworthy-Li公式建立了半群的Lipschitz性质。

摘要:

本工作的目的是在实数轴上的概率测度空间中显式构造一个强Feller半群,该半群还将有界可测函数映射为Lipschitz连续函数,且其Lipschitz常数在小时间下以可积方式爆破。我们的构造依赖于圆上由有色噪声驱动的随机热方程的重排版本。形式上,该随机方程可写为无穷维中的反射方程。在重排作用下,解被迫存在于一个分位数函数空间中,该空间与实数轴上的概率测度空间等距。我们通过一个Euler格式证明该方程可解,在该格式中,我们交替进行圆上随机变量空间中的平坦动力学与一个将随机变量投影回分位数函数子集的重排操作。第一个挑战是证明该格式是胎紧的。第二个挑战是为极限反射方程提供一致的理论,特别是以相关方式解释反射项。我们工作的最后一步是通过改编Bismut-Elworthy-Li公式的早期思想来建立上述半群的Lipschitz性质。

英文摘要:

The purpose of this work is to provide an explicit construction of a strong Feller semigroup on the space of probability measures over the real line that additionally maps bounded measurable functions into Lipschitz continuous functions, with a Lipschitz constant that blows up in an integrable manner in small time. Our construction relies on a rearranged version of the stochastic heat equation on the circle driven by a coloured noise. Formally, this stochastic equation writes as a reflected equation in infinite dimension. Under the action of the rearrangement, the solution is forced to live in a space of quantile functions that is isometric to the space of probability measures on the real line. We prove the equation to be solvable by means of an Euler scheme in which we alternate flat dynamics in the space of random variables on the circle with a rearrangement operation that projects back the random variables onto the subset of quantile functions. A first challenge is to prove that this scheme is tight. A second one is to provide a consistent theory for the limiting reflected equation and in particular to interpret in a relevant manner the reflection term. The last step in our work is to establish the aforementioned Lipschitz property of the semigroup by adapting earlier ideas from the Bismut-Elworthy-Li formula.

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。

↑