arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10700math.DS
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Infinite-Dimensional发展方程的慢流形

Slow Manifolds for Infinite-Dimensional Evolution Equations

Felix Hummel, Christian Kuehn

摘要:

我们将经典的有限维Fenichel理论在两个方向上推广到无限维。在弱假设下,我们证明了一个无限维的快慢系统的解决方案,以及相应的慢流近似。在此之后,我们构造了一个双参数家庭的慢流形$S_{ε,ζ}$的线性部分的慢方程的限制性假设。第二个参数$ζ$不出现在有限维的设置,并描述了一个快速衰减的部分和它的补充缓慢的变量空间的一定分裂。有限维设置作为特殊情况包含,其中$S_{ε,ζ}$不依赖于$ζ$。最后,我们将我们的新技术应用到三个例子的快-慢系统的偏微分方程。

英文摘要:

We extend classical finite-dimensional Fenichel theory in two directions to infinite dimensions. Under comparably weak assumptions we show that the solution of an infinite-dimensional fast-slow system is approximated well by the corresponding slow flow. After that we construct a two-parameter family of slow manifolds $S_{ε,ζ}$ under more restrictive assumptions on the linear part of the slow equation. The second parameter $ζ$ does not appear in the finite-dimensional setting and describes a certain splitting of the slow variable space in a fast decaying part and its complement. The finite-dimensional setting is contained as a special case in which $S_{ε,ζ}$ does not depend on $ζ$. Finally, we apply our new techniques to three examples of fast-slow systems of partial differential equations.

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