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arXiv 1312.5705nlin.PS
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带截断的反应扩散方程速度的移动:推进前沿和双稳态前沿

Shift in the speed of reaction diffusion equation with a cut-off: pushed and bistable fronts

M. C. Depassier, R. D. Benguria

摘要:

研究了小截断条件下反应扩散方程的推进前沿和双稳态前沿速度的变化。我们给出了任意反应项f(u)的速度变化的显式公式。在没有截止的情况下,速度转换对截止参数的依赖性是前速度和轮廓的函数。为了确定速度偏移,我们求解前缘附近的前轮廓u(z)的前阶近似,并使用速度的变分原理。我们将一般公式应用于Nagumo方程,并恢复了最近通过几何分析得到的结果。给出的公式是普遍有效的,我们也将它们应用到一类反应项,这在其他地方没有考虑过。

英文摘要:

We study the change in the speed of pushed and bistable fronts of the reaction diffusion equation in the presence of a small cut-off. We give explicit formulas for the shift in the speed for arbitrary reaction terms f(u). The dependence of the speed shift on the cut-off parameter is a function of the front speed and profile in the absence of the cut-off. In order to determine the speed shift we solve the leading order approximation to the front profile u(z) in the neighborhood of the leading edge and use a variational principle for the speed. We apply the general formula to the Nagumo equation and recover the results which have been obtained recently by geometric analysis. The formulas given are of general validity and we also apply them to a class of reaction terms which have not been considered elsewhere.

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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