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arXiv 1603.04494math.AP
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由快速扩散线引导的波前传播:大扩散和大时间渐近性

Front propagation directed by a line of fast diffusion: large diffusion and large time asymptotics

Laurent Dietrich, Jean-Michel Roquejoffre

摘要:

所研究的系统是一个水平带中的反应扩散方程,通过Robin型交换条件在其上边界耦合到扩散方程。这类模型是由H.别雷斯蒂茨基湖Rossi和第二作者为了模拟由快速扩散线引导的生物入侵。他们证明,特别是,入侵的速度提高了一个快速扩散的线,传播速度渐近正比于平方根的快速扩散系数。这些结果可以减少,在逻辑的情况下,明确的代数计算。本文的目的是证明,同样的现象,具有不同类型的非线性,这排除了明确的计算。我们发现了一个新的过渡现象,我们详细解释。

英文摘要:

The system under study is a reaction-diffusion equation in a horizontal strip, coupled to a diffusion equation on its upper boundary via an exchange condition of the Robin type. This class of models was introduced by H. Berestycki, L. Rossi and the second author in order to model biological invasions directed by lines of fast diffusion. They proved, in particular, that the speed of invasion was enhanced by a fast diffusion on the line, the spreading velocity being asymptotically proportional to the square root of the fast diffusion coefficient. These results could be reduced, in the logistic case, to explicit algebraic computations. The goal of this paper is to prove that the same phenomenon holds, with a different type of nonlinearity, which precludes explicit computations. We discover a new transition phenomenon, that we explain in detail.

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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