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arXiv 1111.3581nlin.AOmath-phmath.MPq-bio.NC
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耦合振子群体中随机固有频率的相干稳定性和影响

Coherence stability and effect of random natural frequencies in populations of coupled oscillators

Giambattista Giacomin, Eric Luçon, Christophe Poquet

摘要:

我们考虑(噪声)仓本模型,这是一个人口的N个振荡器,或旋转,平均场相互作用。每个振子都有自己随机选择的固有频率(淬火无序),并由布朗运动搅动。在极限N去infty这个模型是准确地描述了一个(确定性)福克-普朗克方程。我们研究了这个方程,在弱无序极限下得到了定量的精确结果。我们表明,在一般情况下,即使当固有频率为零的意思是振荡器同步(足够的强相互作用)围绕一个共同的旋转相位,其频率急剧估计。我们还建立了这些解决方案的稳定性(事实上,极限环)。这些结果是通过确定相关的非无序模型的定态解的稳定双曲流形和利用适当扰动下的双曲结构的鲁棒性得到的。当无序分布是对称的速度消失,有一个参数家庭的固定解决方案:在这种情况下,我们提供更精确的稳定性估计。我们使用的方法适用于仓本模型之外,我们在这里开发的情况下,主动转子模型,即在没有相互作用和噪声的情况下,每个转子的动力学不仅仅是旋转。

英文摘要:

We consider the (noisy) Kuramoto model, that is a population of N oscillators, or rotators, with mean-field interaction. Each oscillator has its own randomly chosen natural frequency (quenched disorder) and it is stirred by Brownian motion. In the limit N goes to infty this model is accurately described by a (deterministic) Fokker-Planck equation. We study this equation and obtain quantitatively sharp results in the limit of weak disorder. We show that, in general, even when the natural frequencies have zero mean the oscillators synchronize (for sufficiently strong interaction) around a common rotating phase, whose frequency is sharply estimated. We also establish the stability properties of these solutions (in fact, limit cycles). These results are obtained by identifying the stable hyperbolic manifold of stationary solutions of an associated non disordered model and by exploiting the robustness of hyperbolic structures under suitable perturbations. When the disorder distribution is symmetric the speed vanishes and there is a one parameter family of stationary solutions : in this case we provide more precise stability estimates. The methods we use apply beyond the Kuramoto model and we develop here the case of active rotator models, that is the case in which the dynamics of each rotator in absence of interaction and noise is not simply a rotation.

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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