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arXiv 1907.08992math.AP
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具有无界扩散的抛物型方程的上解及其对几类抛物型和双曲型方程的应用

Supersolutions for parabolic equations with unbounded diffusion and its applications to some classes of parabolic and hyperbolic equations

Motohiro Sobajima, Yuta Wakasugi

摘要:

本文研究了形式为\begin{equation} \partial_t U (x,t)-D(x)ΔU(x,t)=0, \quad (x,t)\in \mathbb{R}^N \times (0,\infty), \end{equation}的抛物型方程的上解,其中$D\in C(\mathbb{R}^N)$是正的.在扩散系数$D$在空间无穷远处为多项式阶的情况下,给出了一族在空间无穷远处具有慢衰减性质的上解.作为第一个应用,证明了相应的抛物型方程的初边值问题的加权$L^2$型衰减估计。第二个应用是研究具有空间依赖阻尼项的波动方程的外问题。通过使用上面提供的超解,示出了具有多项式权和扩散现象的能量估计。

英文摘要:

This paper is concerned with supersolutions to parabolic equations of the form \begin{equation} \partial_t U (x,t)-D(x)ΔU(x,t)=0, \quad (x,t)\in \mathbb{R}^N \times (0,\infty), \end{equation} where $D\in C(\mathbb{R}^N)$ is positive. Under the behavior of the diffusion coefficient $D$ with polynomial order at spatial infinity, a family of supersolutions with slowly decaying property at spatial infinity is provided. As a first application, weighted $L^2$ type decay estimates for the initial-boundary value problem of the corresponding parabolic equation are proved. The second application is the study of the exterior problem of wave equations with space-dependent damping terms. By using supersolutions provided above, energy estimates with polynomial weight and diffusion phenomena are shown.

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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