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arXiv 0812.3205nlin.AO
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对“随机极限环振子的相位约化”一文的评论

Comment on "Phase Reduction of Stochastic Limit Cycle Oscillators"

Hiroya Nakao, Jun-nosuke Teramae, G. Bard Ermentrout

摘要:

这是对Yoshimura和Arai [Phys. Rev. Lett. 101,154101(2008)],其中作者声称,在以前的研究中使用的传统相位随机微分方程没有给出适当的近似,并提出了一个修改的相位方程。在这里,我们指出,这两个相位方程是有效的,这取决于情况。我们认为,振幅弛豫时间和噪声相关时间的相对大小决定了这两个方程是适当的白噪声限制。传统的相位方程也是一个适当的近似噪声极限环具有足够快的振幅松弛,这可以用作进一步分析的起点。

英文摘要:

This is a comment on a recent paper by Yoshimura and Arai [Phys. Rev. Lett. 101, 154101 (2008)] on phase reduction of noisy limit-cycle oscillators, in which the authors claimed that the conventional phase stochastic differential equation used in previous studies does not give a proper approximation and proposed a modified phase equation. Here we point out that both phase equations are valid depending on the situation. We argue that the relative size of amplitude relaxation time and noise correlation time determines which of the two equations is appropriate in the white-noise limit. The conventional phase equation is also a proper approximation to noisy limit cycles with sufficiently fast amplitude relaxation, which can be used as a starting point for further analysis.

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