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arXiv 2004.05252math.DSmath.CA
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Kuramoto模型的渐近锁相动力学和临界耦合强度

Asymptotic phase-locking dynamics and critical coupling strength for the Kuramoto model

Seung-Yeal Ha, Sang Woo Ryoo

摘要:

我们研究了仓本模型的渐近聚簇(锁相)动力学。为了分析仓本流中涌现的渐近模式,我们引入了从部分锁相到完全锁相的急剧转变的路径临界耦合强度,并给出了路径临界耦合强度的非平凡上界.数值模拟表明,多和单集群可以出现在仓本流取决于耦合强度的相对大小相比,自然频率的大小渐近。然而,这种锁相动力学的仓本流的理论和严格的分析仍然缺乏一个完整的理解,虽然有一些最近的进展完全同步的仓本模型在一个足够大的耦合强度制度。在本文中,我们提出了充分的框架部分锁相的多数系综和完全锁相的初始相位配置,耦合强度和自然频率。作为我们的分析的副产品,我们获得了非平凡的上界的路径临界耦合强度的自然频率的直径,初始仓本序参数和系统的大小$N$。我们还证明了序参量小于$N^{-\frac{1}{2}}$的锁相态是线性不稳定的。

英文摘要:

We study the asymptotic clustering (phase-locking) dynamics for the Kuramoto model. For the analysis of emergent asymptotic patterns in the Kuramoto flow, we introduce the pathwise critical coupling strength which yields a sharp transition from partial phase-locking to complete phase-locking, and provide nontrivial upper bounds for the pathwise critical coupling strength. Numerical simulations suggest that multi- and mono-clusters can emerge asymptotically in the Kuramoto flow depending on the relative magnitude of the coupling strength compared to the sizes of natural frequencies. However, theoretical and rigorous analysis for such phase-locking dynamics of the Kuramoto flow still lacks a complete understanding, although there were some recent progress on the complete synchronization of the Kuramoto model in a sufficiently large coupling strength regime. In this paper, we present sufficient frameworks for partial phase-locking of a majority ensemble and the complete phase-locking in terms of the initial phase configuration, coupling strength and natural frequencies. As a by-product of our analysis, we obtain nontrivial upper bounds for the pathwise critical coupling strength in terms of the diameter of natural frequencies, initial Kuramoto order parameter and the system size $N$. We also show that phase-locked states whose order parameters are less than $N^{-\frac{1}{2}}$ are linearly unstable.

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