arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.0306math.AP
收藏

一个广义分数阶多孔介质方程

A general fractional porous medium equation

Arturo de Pablo, Fernando Quirós, Ana Rodríguez, Juan Luis Vázquez

摘要:

我们考虑了数据$f\in L^1(\mathbb{R}^N)$和所有指数$0<σ<2$和$m>0$,建立了具有分数阶扩散的多孔介质方程$$ \{ll} \dfrac{\partial u}{\partial t} + (-Δ)^{σ/2} (|u|^{m-1}u)=0, & \qquad x\in\mathbb{R}^N,\; t>0, [8pt] u(x,0) = f(x), & \qquad x\in\mathbb{R}^N.%. $$解的存在唯一性定理.证明了$m> m_*=(N-σ)_+ /N$弱解的存在唯一性,从而得到了一个$L^1$ -压缩半群.此外,我们还得到了这些解的主要定性性质。在较低的范围内,在一定的限制条件下,$0<m\le m_*$存在唯一的具有良好性质的解,且其性质不同于上述$m_*$的情形.我们还研究了解对$f,m$和$σ$的依赖性。此外,我们考虑上述问题的有界区域中提出的问题。

英文摘要:

We develop a theory of existence and uniqueness for the following porous medium equation with fractional diffusion, $$ \{ll} \dfrac{\partial u}{\partial t} + (-Δ)^{σ/2} (|u|^{m-1}u)=0, & \qquad x\in\mathbb{R}^N,\; t>0, [8pt] u(x,0) = f(x), & \qquad x\in\mathbb{R}^N.%. $$ We consider data $f\in L^1(\mathbb{R}^N)$ and all exponents $0<σ<2$ and $m>0$. Existence and uniqueness of a weak solution is established for $m> m_*=(N-σ)_+ /N$, giving rise to an $L^1$-contraction semigroup. In addition, we obtain the main qualitative properties of these solutions. In the lower range $0<m\le m_*$ existence and uniqueness of solutions with good properties happen under some restrictions, and the properties are different from the case above $m_*$. We also study the dependence of solutions on $f,m$ and $σ$. Moreover, we consider the above questions for the problem posed in a bounded domain.

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。

↑