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arXiv 0810.4161cond-mat.stat-mech
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自催化反应中的增强随机振荡

Enhanced stochastic oscillations in autocatalytic reactions

Thierry Dauxois, Francesca Di Patti, Duccio Fanelli, Alan McKane

摘要:

我们研究了一个简化的$k$耦合自催化反应,以前介绍的Togashi和Kaneko的计划。随机波动的作用是阐明通过使用的van Kampen系统的大小扩展和结果相比,直接随机模拟。定期的时间振荡预测发生的各种化学成分的浓度,与增强的振幅导致的共振,这是由系统的固有颗粒感。确定相关的功率谱,并根据化学成分的数量$k$具有不同的形式。我们对$k=4$和$k=8$这两种情况进行了详细的比较。在这两种情况下的功率谱的理论和数值结果之间的协议是好的。在$k=8$系统中,得到的光谱特别令人感兴趣,因为它有两个峰,系统尺寸扩展仍然能够准确地再现。

英文摘要:

We study a simplified scheme of $k$ coupled autocatalytic reactions, previously introduced by Togashi and Kaneko. The role of stochastic fluctuations is elucidated through the use of the van Kampen system-size expansion and the results compared with direct stochastic simulations. Regular temporal oscillations are predicted to occur for the concentration of the various chemical constituents, with an enhanced amplitude resulting from a resonance which is induced by the intrinsic graininess of the system. The associated power spectra are determined and have a different form depending on the number of chemical constituents, $k$. We make detailed comparisons in the two cases $k=4$ and $k=8$. Agreement between the theoretical and numerical results for the power spectrum are good in both cases. The resulting spectrum is especially interesting in the $k=8$ system, since it has two peaks, which the system-size expansion is still able to reproduce accurately.

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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