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arXiv 1111.3540math.AP
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Allen-Cahn方程和FitzHugh-Nagumo系统的形式渐近展开式在一般初值下的有效性

On the validity of formal asymptotic expansions in Allen-Cahn equation and FitzHugh-Nagumo system with generic initial data

Matthieu Alfaro, Hiroshi Matano

摘要:

形式渐近展开长期以来被用于研究奇摄动Allen-Cahn型方程和反应扩散方程组,特别是FitzHugh-Nagumo方程组.尽管他们的成功的作用,它一直在很大程度上不清楚是否真的这样的扩展代表的解决方案,而一般的初始数据的实际概况。结合我们的结果和已知的Allen-Cahn方程永恒解的性质,我们证明了形式展开式主项对于一类大的解的有效性.

英文摘要:

Formal asymptotic expansions have long been used to study the singularly perturbed Allen-Cahn type equations and reaction-diffusion systems, including in particular the FitzHugh-Nagumo system. Despite their successful role, it has been largely unclear whether or not such expansions really represent the actual profile of solutions with rather general initial data. By combining our earlier result and known properties of eternal solutions of the Allen-Cahn equation, we prove validity of the principal term of the formal expansions for a large class of solutions.

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