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arXiv 2201.12190math.DS
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对称时滞微分方程的特征矩阵函数

Characteristic matrix functions for delay differential equations with symmetry

Babette de Wolff

摘要:

特征矩阵函数捕获矩阵值函数中有界线性算子的谱信息。本文考虑一类具有离散时滞的时滞微分方程,并假设该方程关于紧对称群是等变的。在此假设下,延迟微分方程可以有离散波解,即具有离散时空对称群的周期解。我们表明,如果一个离散波的解决方案有一个合理的时间延迟相关的周期,那么我们可以确定其稳定性使用的特征矩阵函数。证明依赖于等变Floquet理论和Kaashoek和Verduyn Lunel关于紧算子类的特征矩阵函数的结果。我们讨论了我们的结果的背景下,延迟反馈稳定的周期轨道的应用。

英文摘要:

A characteristic matrix function captures the spectral information of a bounded linear operator in a matrix-valued function. In this article, we consider a delay differential equation with one discrete time delay and assume this equation is equivariant with respect to a compact symmetry group. Under this assumption, the delay differential equation can have discrete wave solutions, i.e. periodic solutions that have a discrete group of spatio-temporal symmetries. We show that if a discrete wave solution has a period that is rationally related to the time delay, then we can determine its stability using a characteristic matrix function. The proof relies on equivariant Floquet theory and results by Kaashoek and Verduyn Lunel on characteristic matrix functions for classes of compact operators. We discuss applications of our result in the context of delayed feedback stabilization of periodic orbits.

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