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arXiv 0902.2750math.AP
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快速p-Laplacian方程的局部光滑效应、正性和Harnack不等式

Local smoothing effects, positivity, and Harnack inequalities for the fast p-Laplacian equation

M. Bonforte, R. G. Iagar, J. L. Vazquez

摘要:

利用$1<p<2$研究了快速$p$ -Laplacian方程$\partial_t u=Δ_{p}u$局部弱解的定性和定量性质.我们的主要结果是在$\RR^n\times [0,T]$域上的局部定义解的定量正性和有界性估计。我们结合这些下限和上限在不同形式的内在Harnack不等式,这是新的非常快的扩散范围内,即当$1<p \le 2n/(n+1)$。有界性结果也可以推广到极限情况$p=1$,而正性估计不能。证明了任意$1<p<2$大解的存在性和精确的渐近估计,并指出了它们的主要性质.我们还证明了一个新的局部能量不等式的梯度的适当的范数的解决方案。因此,我们证明了有界局部弱解确实是局部强解,更准确地说是$\partial_t u\in L^2_{\rm loc}$。

英文摘要:

We study qualitative and quantitative properties of local weak solutions of the fast $p$-Laplacian equation, $\partial_t u=Δ_{p}u$, with $1<p<2$. Our main results are quantitative positivity and boundedness estimates for locally defined solutions in domains of $\RR^n\times [0,T]$. We combine these lower and upper bounds in different forms of intrinsic Harnack inequalities, which are new in the very fast diffusion range, that is when $1<p \le 2n/(n+1)$. The boundedness results may be also extended to the limit case $p=1$, while the positivity estimates cannot. We prove the existence as well as sharp asymptotic estimates for the so-called large solutions for any $1<p<2$, and point out their main properties. We also prove a new local energy inequality for suitable norms of the gradients of the solutions. As a consequence, we prove that bounded local weak solutions are indeed local strong solutions, more precisely $\partial_t u\in L^2_{\rm loc}$.

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