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arXiv 1004.1735math.AP
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初始数据具有慢指数衰减时Fisher-KPP方程的锐界面极限

Sharp interface limit of the Fisher-KPP equation when initial data have slow exponential decay

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$\ep \to 0$。我们考虑具有紧支集的初始数据加上{ \it慢指数衰减}的扰动。我们证明了锐界面极限以恒定的速度移动,这极大地依赖于初始数据的尾部。通过对界面的产生和运动的精细分析,给出了过渡层厚度的新估计。

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 perturbations with {\it slow exponential decay}. We prove that the sharp interface limit moves by a constant speed, which dramatically depends on the tails of the initial data. By performing a fine analysis of both the generation and motion of interface, we provide a new estimate of the thickness of the transition layers.

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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