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arXiv math/0212231math.APmath.DS
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一类双稳态系统波前的去稳定化

Destabilization of fronts in a class of bi-stable systems

Arjen Doelman David Iron Yasumasa Nishiura

摘要:

本文考虑了一类在实直线上具有两个分量的双稳态反应扩散方程。我们假设系统是奇摄动的,即扩散系数的比值(渐近)小。这类承认前的解决方案是渐近接近的(稳定)前解决方案的“平凡”标量双稳定极限系统$u_t = u_{xx} + u(1-u^2)$。然而,在系统中,这些前沿可以通过改变参数而变得不稳定。这种不稳定是由与线性化稳定性问题相关联的本质谱引起的,或者是由存在于本质谱附近的本征值引起的。我们使用Evans函数来研究各种分歧机制,并建立一个明确的连接之间的字符的不稳定和可能出现的鞍结分歧的异宿轨道的存在性问题。

英文摘要:

In this article, we consider a class of bi-stable reaction-diffusion equations in two components on the real line. We assume that the system is singularly perturbed, i.e. that the ratio of the diffusion coefficients is (asymptotically) small. This class admits front solutions that are asymptotically close to the (stable) front solution of the `trivial' scalar bi-stable limit system $u_t = u_{xx} + u(1-u^2)$. However, in the system these fronts can become unstable by varying parameters. This destabilization is either caused by the essential spectrum associated to the linearized stability problem, or by an eigenvalue that exists near the essential spectrum. We use the Evans function to study the various bifurcation mechanisms and establish an explicit connection between the character of the destabilization and the possible appearance of saddle-node bifurcations of heteroclinic orbits in the existence problem.

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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