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arXiv 2012.07484math.DS
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fold-Hopf分岔产生的小振幅周期波的不稳定性

Instability of small-amplitude periodic waves from fold-Hopf bifurcation

Shuang Chen, Jinqiao Duan

AI总结:

本文研究反应-扩散方程耦合常微分方程系统中fold-Hopf分岔产生的小振幅周期波,利用平均理论证明其存在性,并通过相对有界扰动与不稳定谱分析证明其不稳定性。

摘要:

我们研究由一个反应-扩散方程与一个常微分方程耦合而成的系统中,从fold-Hopf平衡点产生的小振幅周期波的存在性与稳定性。该耦合系统涵盖FitzHugh-Nagumo系统、简化钙模型、消费者-资源模型以及其他实际应用中的模型。基于平均理论的最新结果,我们求解相关三维系统中的周期解,进而证明由fold-Hopf分岔产生的周期波的存在性。[J. Tsai、W. Zhang、V. Kirk和J. Sneyd,SIAM J. Appl. Dyn. Syst. 11 (2012),1149--1199]中的数值计算曾表明,简化钙模型中由fold-Hopf分岔产生的周期波在谱意义上不稳定,但当时并未给出证明。通过利用相对有界扰动分析周期波附近的线性化,我们借助对fold-Hopf平衡点附近线性化的不稳定谱进行扰动,证明了小振幅周期波的不稳定性。作为应用,我们证明了在外加电流作用下的FitzHugh-Nagumo系统中,由fold-Hopf分岔产生的小振幅周期波的存在性与稳定性。

英文摘要:

We study the existence and stability of small-amplitude periodic waves emerging from fold-Hopf equilibria in a system of one reaction-diffusion equation coupled with one ordinary differential equation. This coupled system includes the FitzHugh-Nagumo system, caricature calcium models, consumer-resource models and other models in the real-world applications. Based on the recent results on the averaging theory, we solve periodic solutions in related three-dimensional systems and then prove the existence of periodic waves arising from fold-Hopf bifurcations. Numerical computation in [J. Tsai, W. Zhang, V. Kirk, and J. Sneyd, SIAM J. Appl. Dyn. Syst. 11 (2012), 1149--1199] once suggested that the periodic waves from fold-Hopf bifurcations in a caricature calcium model are spectrally unstable, yet without a proof. After analyzing the linearization about periodic waves by the relatively bounded perturbation, we prove the instability of small-amplitude periodic waves through a perturbation of the unstable spectra for the linearizations about the fold-Hopf equilibria. As an application, we prove the existence and stability of small-amplitude periodic waves from fold-Hopf bifurcations in the FitzHugh-Nagumo system with an applied current.

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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