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arXiv 0910.2222math.AP
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Fisher-KPP方程的锐界面极限

Sharp interface limit of the Fisher-KPP equation

Matthieu Alfaro, Arnaud Ducrot

摘要:

本文研究了Fisher方程$\partial_t u=\ep Δu + \ep ^{-1}u(1-u)$在全空间上的奇异极限$\ep \to 0$。我们考虑初始数据与紧支持加上,可能的话,扰动非常小的$\Vert x \Vert \to \infty$。通过证明界面性质的产生和运动,我们证明了尖锐的界面极限以恒定的速度移动,这是一些相关的一维行波的最小速度。我们得到的过渡层的厚度的估计。我们还展示了初始数据“不那么小”在无穷远,不允许界面现象。

英文摘要:

We investigate the singular limit, as $\ep \to 0$, of the Fisher equation $\partial_t u=\ep Δu + \ep ^{-1}u(1-u)$ in the whole space. We consider initial data with compact support plus, possibly, perturbations very small as $\Vert x \Vert \to \infty$. By proving both generation and motion of interface properties, we show that the sharp interface limit moves by a constant speed, which is the minimal speed of some related one-dimensional travelling waves. We obtain an estimate of the thickness of the transition layers. We also exhibit initial data "not so small" at infinity which do not allow the interface phenomena.

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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