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arXiv 1911.03217cond-mat.stat-mechnlin.AO
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具有双峰频率分布的耦合振子噪声系统的Phase diagram

Phase diagram of noisy systems of coupled oscillators with a bimodal frequency distribution

Alessandro Campa

摘要:

本文研究了噪声环境下全局耦合振子大系统的性质。当振子的固有频率的分布是双峰的并且其在复平面中的解析延拓在下半平面中仅具有少数极点时,由用于单粒子分布函数的Fokker-Planck方程控制的系统的动力学可以被简化为描述适当定义的序参量的动力学的常微分方程系统,其中的第一个与通常的同步序参量有关。我们得到的振荡器系统的完整的相位图,显示了一个非常丰富的行为,其特征在于由同步状态,具有周期性状态的区域,和其他具有双稳定性的区域,与滞后的存在相关。后一种现象通过对整个耦合振子系统的数值模拟得到了证实。我们比较我们的结果与先前获得的无噪声系统,我们表明,增加噪声的相图的变化定性,倾向于简单的图,发现系统的单峰频率分布。

英文摘要:

We study the properties of large systems of globally coupled oscillators in the presence of noise. When the distribution of the natural frequencies of the oscillators is bimodal and its analytical continuation in the complex plane has only few poles in the lower half plane, the dynamics of the system, governed by a Fokker-Planck equation for the single particle distribution function, can be reduced to a system of ordinary differential equations describing the dynamics of suitably defined order parameters, the first ones of which are related to the usual synchronization order parameter. We obtain the full phase diagram of the oscillator system, that shows a very rich behaviour, with regions characterized by synchronized states, regions with periodic states, and others with bi-stability, associated to the presence of hysteresis. The latter phenomenon is confirmed by numerical simulations ot the full system of coupled oscillators. We compare our results with those previously obtained for noiseless systems, and we show that for increasing noise the phase diagram changes qualitatively, tending to the simple diagram that is found for systems with unimodal frequency distributions.

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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