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arXiv 1904.03072math.AP
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反应扩散方程组平面波的锐弛豫率

Sharp relaxation rates for plane waves of reaction-diffusion systems

Fazel Hadadifard, Atanas G. Stefanov

摘要:

一维一般反应扩散系统的谱稳定行波是渐近稳定的,具有指数松弛率,这是众所周知的经典结果。在20世纪90年代的一系列工作中,作者考虑了这种系统的平面行波,并成功地证明了这种对象的渐近稳定性。有趣的是,他们所展示的弛豫率(估计)都是代数和维数相关的。有人论证说,当频谱间隙在$n\geq 2$维中闭合时,代数速率是最好的可能。在本文中,我们重新讨论这个问题。我们严格计算的急剧松弛率在$L^\infty$为基础的空间,无论是渐近相位和辐射条款。这些原来是确实是代数,但约两倍以上的最好的,在这些早期的作品,虽然这可以主要归因于使用Sobolev嵌入控制$L^\infty$规范的高秩序$L^2$基于索伯列夫空间规范的效率低下。最后,我们明确地构建了领先的顺序配置文件,无论是相位和辐射条款。我们的方法依赖于缩放变量的方法,它提供了尖锐的弛豫率在一类加权$L^2$空间以及。

英文摘要:

It is well-known and classical result that spectrally stable traveling waves of a general reaction-diffusion system in one spatial dimension are asymptotically stable with exponential relaxation rates. In a series of works in the 1990's, the authors have considered plane traveling waves for such systems and they have succeeded in showing asymptotic stability for such objects. Interestingly, the (estimates for the) relaxation rates that they have exhibited, are all algebraic and dimension dependent. It was heuristically argued that as the spectral gap closes in dimensions $n\geq 2$, algebraic rates are the best possible. In this paper, we revisit this issue. We rigorously calculate the sharp relaxation rates in $L^\infty$ based spaces, both for the asymptotic phase and the radiation terms. These turn out to be are indeed algebraic, but about twice better than the best ones obtained in these early works, although this can be mostly attributed to the inefficiencies of using Sobolev embeddings to control $L^\infty$ norms by high order $L^2$ based Sobolev space norms. Finally, we explicitly construct the leading order profiles, both for the phase and the radiation terms. Our approach relies on the method of scaling variables, which provides sharp relaxation rates in a class of weighted $L^2$ spaces as well.

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