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arXiv 2104.00330math.DSmath.AP
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一类基于记忆的扩散系统中记忆时滞引起的空间非齐次Hopf分支

The spatially inhomogeneous Hopf bifurcation induced by memory delay in a memory-based diffusion system

Yongli Song, Yahong Peng, Tonghua Zhang

摘要:

基于记忆的扩散系统在实际中有着广泛的应用。从这样的系统中观察到Hopf分岔。为了满足计算这类系统Hopf分支规范形的需要,我们提出了一种新的有效算法,其中记忆延迟被视为扰动参数。为了说明算法的有效性,我们考虑了一个具有记忆扩散和Holling Ⅱ型功能反应的扩散捕食系统。通过采用这种新开发的程序,我们调查的方向和稳定性的延迟诱导模式-1和模式-2的Hopf分岔。数值模拟证实了我们的理论发现,即存在具有模式1和模式2空间模式的稳定的空间非齐次周期解,以及从不稳定的模式2空间非齐次周期解到稳定的模式1空间非齐次周期解的过渡.

英文摘要:

The memory-based diffusion systems have wide applications in practice. Hopf bifurcations are observed from such systems. To meet the demand for computing the normal forms of the Hopf bifurcations of such systems, we develop an effective new algorithm where the memory delay is treated as the perturbation parameter. To illustrate the effectiveness of the algorithm, we consider a diffusive predator-prey system with memory-based diffusion and Holling type-II functional response. By employing this newly developed procedure, we investigate the direction and stability of the delay-induced mode-1 and mode-2 Hopf bifurcations. Numerical simulations confirm our theoretical findings, that is the existence of stable spatially inhomogeneous periodic solutions with mode-1 and mode-2 spatial patterns, and the transition from the unstable mode-2 spatially inhomogeneous periodic solution to the stable mode-1 spatially inhomogeneous periodic solution.

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