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arXiv 2106.07784math.DS
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具有惯性的Kuramoto模型混合的稳定性和分支

Stability and bifurcation of mixing in the Kuramoto model with inertia

Hayato Chiba, Georgi S. Medvedev

摘要:

本文分析了图的收敛序列上耦合二阶阻尼振子的仓本模型。该模型中的振子具有随机的固有频率,并通过非线性耦合相互作用。耦合系统的连通性由一个图指定,该图也可以是随机的。在热力学极限下,系统的行为由Vlasov方程捕获,Vlasov方程是相空间中振子的概率分布的双曲偏微分方程。我们研究的稳定性的混合,一个稳定的状态解决方案的弗拉索夫方程,对应于均匀分布的相位。具体来说,我们确定了一个临界值的耦合强度,在该系统经历了干草叉分叉。它对应于混合稳定性的丧失,标志着同步的开始。对于经典的仓本模型,虚轴上连续谱的存在是稳定性分析的主要困难。为了克服这个问题,我们使用的方法从广义谱理论开发的原始仓本模型。分析结果与数值计算的Kuramoto模型的Erdens-Rényi和小世界图的分歧图说明。二阶仓本模型的应用包括电力网络、耦合摆和各种生物网络。本文的分析提供了一个数学描述的发病同步在这些系统。

英文摘要:

The Kuramoto model of coupled second order damped oscillators on convergent sequences of graphs is analyzed in this work. The oscillators in this model have random intrinsic frequencies and interact with each other via nonlinear coupling. The connectivity of the coupled system is assigned by a graph which may be random as well. In the thermodynamic limit the behavior of the system is captured by the Vlasov equation, a hyperbolic partial differential equation for the probability distribution of the oscillators in the phase space. We study stability of mixing, a steady state solution of the Vlasov equation, corresponding to the uniform distribution of phases. Specifically, we identify a critical value of the strength of coupling, at which the system undergoes a pitchfork bifurcation. It corresponds to the loss of stability of mixing and marks the onset of synchronization. As for the classical Kuramoto model, the presence of the continuous spectrum on the imaginary axis poses the main difficulty for the stability analysis. To overcome this problem, we use the methods from the generalized spectral theory developed for the original Kuramoto model. The analytical results are illustrated with numerical bifurcation diagrams computed for the Kuramoto model on Erdős--Rényi and small-world graphs. Applications of the second-order Kuramoto model include power networks, coupled pendula, and various biological networks. The analysis in this paper provides a mathematical description of the onset of synchronization in these systems.

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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