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arXiv 0810.1537cond-mat.stat-mechcond-mat.dis-nn
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全局耦合双稳态系统中的有限尺寸涨落与随机共振

Finite size fluctuations and stochastic resonance in globally coupled bistable systems

David Cubero

摘要:

研究了由有限个全局耦合双稳态振子组成的系统在外力作用下的动力学行为,其全局变量定义为各振子变量的算术平均值.提出了几种基于随机方程族截断格式的波动累积量模型。这一层次是使用伊藤随机微积分推导出来的,其中的噪声项使用对大$N$有效的渐近近似来处理。此外,还考虑了基于有效势的简化单变量模型。这些模型的随机共振现象的框架进行了测试。反过来,他们被用来解释在这些有限的系统中最近观察到的非常大的增益简单。

英文摘要:

The dynamics of a system formed by a finite number $N$ of globally coupled bistable oscillators and driven by external forces is studied focusing on a global variable defined as the arithmetic mean of each oscillator variable. Several models based on truncation schemes of a hierarchy of stochastic equations for a set of fluctuating cumulant variables are presented. This hierarchy is derived using Itô stochastic calculus, and the noise terms in it are treated using an asymptotic approximation valid for large $N$. In addition, a simplified one-variable model based on an effective potential is also considered. These models are tested in the framework of the phenomenon of stochastic resonance. In turn, they are used to explain in simple terms the very large gains recently observed in these finite systems.

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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