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arXiv 1503.07704math.AP
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具有临界梯度吸收的拟线性扩散方程的大时间行为

Large time behavior for a quasilinear diffusion equation with critical gradient absorption

Razvan Gabriel Iagar, Philippe Laurençot

摘要:

研究了具有临界梯度吸收的非线性扩散方程$p\in(2,\infty)$的非负解的大时间行为。我们证明了在适当的对数时间和空间尺度下,$p$ -Laplacian方程的源型自相似解给出了紧支撑解的渐近轮廓.在这个过程中,我们还得到了紧支撑解的最优衰减率和支撑的最优扩张率,大大改进了以前的结果。

英文摘要:

We study the large time behavior of non-negative solutions to the nonlinear diffusion equation with critical gradient absorption $$\partial\_t u - Δ\_{p}u + |\nabla u|^{q\_*} = 0 \quad \hbox{in} (0,\infty)\times\mathbb{R}^N\ ,$$ for $p\in(2,\infty)$ and $q\_*:=p-N/(N+1)$. We show that the asymptotic profile of compactly supported solutions is given by a source-type self-similar solution of the $p$-Laplacian equation with suitable logarithmic time and space scales. In the process, we also get optimal decay rates for compactly supported solutions and optimal expansion rates for their supports that strongly improve previous results.

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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