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arXiv 2008.12540math.AP
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抛物型$p$ -Laplace方程在快扩散情形下的超热函数

Supercaloric functions for the parabolic $p$-Laplace equation in the fast diffusion case

Ratan Kr. Giri, Juha Kinnunen, Kristian Moring

摘要:

研究抛物型$p$ -Laplace方程的一类广义上解,即所谓的$p$ -超热函数.这类函数被定义为在稠密集上有限且满足抛物比较原理的下连续函数。对于$p\geq 2$,它们的性质相对较好理解,但对于快速扩散情况$1<p<2$知之甚少。每一个有界的$p$ -超热函数都属于自然索伯列夫空间,并且在整个$1<p<\infty$范围内都是抛物型$p$ -拉普拉斯方程的弱上解.我们的主要结果表明,无界$p$ -超热函数分为两个相互排斥的类尖锐的局部可积性估计的功能和它的弱梯度在超临界情况下$\frac{2n}{n+1}<p<2$。Barenblatt解和无限点源解表明这两种情况都发生了。巴伦布拉特解决方案不存在于亚临界情况下$1<p\leq \frac{2n}{n+1}$和理论尚未得到很好的理解。

英文摘要:

We study a generalized class of supersolutions, so-called $p$-supercaloric functions, to the parabolic $p$-Laplace equation. This class of functions is defined as lower semicontinuous functions that are finite in a dense set and satisfy the parabolic comparison principle. Their properties are relatively well understood for $p\geq 2$, but little is known in the fast diffusion case $1<p<2$. Every bounded $p$-supercaloric function belongs to the natural Sobolev space and is a weak supersolution to the parabolic $p$-Laplace equation for the entire range $1<p<\infty$. Our main result shows that unbounded $p$-supercaloric functions are divided into two mutually exclusive classes with sharp local integrability estimates for the function and its weak gradient in the supercritical case $\frac{2n}{n+1}<p<2$. The Barenblatt solution and the infinite point source solution show that both alternatives occur. Barenblatt solutions do not exist in the subcritical case $1<p\leq \frac{2n}{n+1}$ and the theory is not yet well understood.

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