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arXiv 0709.2082math.AP
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具梯度吸收的非线性抛物型方程的局部非扩散渐近模式

Localized non-diffusive asymptotic patterns for nonlinear parabolic equations with gradient absorption

Philippe Laurençot, Juan Luis Vázquez

摘要:

本文研究了具有非线性扩散和梯度吸收的发展方程$\partial_t u - Δ_p u + |\nabla u|^q=0$的解$u$的大时间行为。我们考虑的问题提出了$x\in {\mathbb R}^N $和$t>0$与非负的和compressive支持的初始数据。我们取对应于慢$p$扩散的指数$p>2$和超线性范围$1<q<p-1$中的指数$q$。在这个范围内的哈密顿-雅可比项$ |\nabla u|^q$的影响是决定性的,并引起本地化的现象。大的时间行为描述在一个合适的自相似的解决方案,解决了汉密尔顿-雅可比方程。相应的空间模式的形状是相当圆锥形,而不是钟形或抛物线。

英文摘要:

We study the large-time behaviour of the solutions $u$ of the evolution equation involving nonlinear diffusion and gradient absorption $\partial_t u - Δ_p u + |\nabla u|^q=0$. We consider the problem posed for $x\in {\mathbb R}^N $ and $t>0$ with non-negative and compactly supported initial data. We take the exponent $p>2$ which corresponds to slow $p$-Laplacian diffusion, and the exponent $q$ in the superlinear range $1<q<p-1$. In this range the influence of the Hamilton-Jacobi term $ |\nabla u|^q$ is determinant, and gives rise to the phenomenon of localization. The large time behaviour is described in terms of a suitable self-similar solution that solves a Hamilton-Jacobi equation. The shape of the corresponding spatial pattern is rather conical instead of bell-shaped or parabolic.

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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