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arXiv 1008.0249math.DS
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关于infinite dimensional Kuramoto模型分支结构的Kuramoto猜想的证明

A proof of the Kuramoto conjecture for a bifurcation structure of the infinite dimensional Kuramoto model

Hayato Chiba

摘要:

仓本模型是用于描述被定义为耦合相位振荡器的同步现象的常微分方程的系统。研究了无穷维Kuramoto模型的分支结构。对于定义了Kuramoto模型线性部分的非自伴线性算子,借助于一个操纵的Hilbert空间,发展了广义函数广义函数空间上的谱理论,以避免在虚轴上出现连续谱.虽然线性算子在Hilbert空间上具有无界连续谱,但在广义函数广义函数空间上,它允许由可数个本征函数组成的谱分解.利用谱分解计算线性算子生成的半群,证明系统定态的线性稳定性。中心流形理论也在广义函数空间上得到了发展。证明了广义函数广义函数空间上存在有限维的中心流形,而Hilbert空间上的中心流形由于其虚轴上的连续谱而具有无限维.将所得结果应用于Kuramoto模型的稳定性和分歧理论,得到了Kuramoto绘制的分岔图。如果振荡器之间的耦合强度$K$小于某个阈值$K_c$,则去同步状态被证明是渐近稳定的,并且如果$K$超过$K_c$,则对应于同步的非平凡解从去同步状态分叉。

英文摘要:

The Kuramoto model is a system of ordinary differential equations for describing synchronization phenomena defined as a coupled phase oscillators. In this paper, a bifurcation structure of the infinite dimensional Kuramoto model is investigated. For a certain non-selfadjoint linear operator, which defines a linear part of the Kuramoto model, the spectral theory on a space of generalized functions is developed with the aid of a rigged Hilbert space to avoid a continuous spectrum on the imaginary axis. Although the linear operator has an unbounded continuous spectrum on a Hilbert space, it is shown that it admits a spectral decomposition consisting of a countable number of eigenfunctions on a space of generalized functions. The semigroup generated by the linear operator is calculated by using the spectral decomposition to prove the linear stability of a steady state of the system. The center manifold theory is also developed on a space of generalized functions. It is proved that there exists a finite dimensional center manifold on a space of generalized functions, while a center manifold on a Hilbert space is of infinite dimensional because of the continuous spectrum on the imaginary axis. The results are applied to the stability and bifurcation theory of the Kuramoto model to obtain a bifurcation diagram conjectured by Kuramoto. If the coupling strength $K$ between oscillators is smaller than some threshold $K_c$, the de-synchronous state proves to be asymptotically stable, and if $K$ exceeds $K_c$, a nontrivial solution, which corresponds to the synchronization, bifurcates from the de-synchronous state.

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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