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arXiv math/0703088math.PR
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带分数色噪声的随机Heat Equation:解的存在性

The Stochastic Heat Equation with a Fractional-Colored Noise: Existence of the Solution

Raluca Balan, Ciprian Tudor

摘要:

在这篇文章中,我们考虑随机热方程$u_{t}-Δu=\dot B$在$(0,T) \times \bR^d$中,初始条件为零,由高斯噪声$\dot B$驱动,该噪声在时间上是分数的,具有Hurst指数$H \in (1/2,1)$,在空间上是有色的,空间协方差由函数$f$给出。我们的主要结果给出了$H$上过程解存在的充分必要条件。当$f$是$α\in (0,d)$阶的Riesz核时,该条件是$H>(d-α)/4$,这是当噪声$\dot B$在空间中是白色时$H>d/4$遇到的条件的放宽。当$f$是贝塞尔核或热核时,条件保持为$H>d/4$。

英文摘要:

In this article we consider the stochastic heat equation $u_{t}-Δu=\dot B$ in $(0,T) \times \bR^d$, with vanishing initial conditions, driven by a Gaussian noise $\dot B$ which is fractional in time, with Hurst index $H \in (1/2,1)$, and colored in space, with spatial covariance given by a function $f$. Our main result gives the necessary and sufficient condition on $H$ for the existence of the process solution. When $f$ is the Riesz kernel of order $α\in (0,d)$ this condition is $H>(d-α)/4$, which is a relaxation of the condition $H>d/4$ encountered when the noise $\dot B$ is white in space. When $f$ is the Bessel kernel or the heat kernel, the condition remains $H>d/4$.

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。

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