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arXiv 1107.4501nlin.AOmath-phmath.MP
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耦合有噪相位振子Kuramoto模型的全局吸引子和渐近动力学

Global attractor and asymptotic dynamics in the Kuramoto model for coupled noisy phase oscillators

Giambattista Giacomin, Khashayar Pakdaman, Xavier Pellegrin

摘要:

我们研究了白噪声作用下耦合相位振子的仓本模型的大N极限动力学。我们引入了阴影惯性流形的概念,我们证明了它们的存在性,这个模型,支持的事实,即长期动力学的这个模型是有限维的。在此之后,我们证明了该模型的全局吸引子采取两种形式之一。当耦合强度低于临界值时,全局吸引子是一个对应于非相干态的平衡点。相反,当耦合强度超过这个临界值时,全局吸引子是一个由径向轨迹组成的二维盘,该径向轨迹将鞍形平衡(非相干态)连接到局部稳定平衡(部分同步态)的不变闭合曲线。我们的分析取决于,一方面,尖锐的存在性和唯一性的结果和它们的后果的存在性的全球吸引子,另一方面,在非相干和同步平衡附近的动力学的研究。我们特别证明了每个同步平衡的非线性稳定性,和正常的双曲性等平衡的集合。我们在数学和数值上探讨了全局吸引子的几个性质,特别是我们讨论了噪声强度降低到零时吸引子的极限。

英文摘要:

We study the dynamics of the large N limit of the Kuramoto model of coupled phase oscillators, subject to white noise. We introduce the notion of shadow inertial manifold and we prove their existence for this model, supporting the fact that the long term dynamics of this model is finite dimensional. Following this, we prove that the global attractor of this model takes one of two forms. When coupling strength is below a critical value, the global attractor is a single equilibrium point corresponding to an incoherent state. Conversely, when coupling strength is beyond this critical value, the global attractor is a two-dimensional disk composed of radial trajectories connecting a saddle equilibrium (the incoherent state) to an invariant closed curve of locally stable equilibria (partially synchronized state). Our analysis hinges, on the one hand, upon sharp existence and uniqueness results and their consequence for the existence of a global attractor, and, on the other hand, on the study of the dynamics in the vicinity of the incoherent and synchronized equilibria. We prove in particular non-linear stability of each synchronized equilibrium, and normal hyperbolicity of the set of such equilibria. We explore mathematically and numerically several properties of the global attractor, in particular we discuss the limit of this attractor as noise intensity decreases to zero.

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