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arXiv 0907.0456nlin.PS
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Turing-Hopf分岔附近的强迫模式

Forced patterns near a Turing-Hopf bifurcation

C. M. Topaz, Anne J. Catlla

摘要:

我们研究了图灵-霍普夫分岔点附近空间扩展模式的时间周期强迫。一个基于正则形式的分析产生了几个预测,包括(i)弱强迫附近的固有的霍普夫频率增强或抑制图灵振幅的量,规模平方与强迫强度,和(ii)最强的效果是从霍普夫频率失谐的强迫。为了将我们的结果应用到具体的模型中,我们对一般的两组分反应扩散系统进行了扰动分析,揭示了强迫是抑制还是增强了空间模式。对于抑制的情况,我们的结果解释了以前的CDIMA化学反应实验的特点。然而,我们也发现了增强的情况下,这还没有在实验中观察到的例子。数值模拟验证了预测的强迫参数的依赖性。

英文摘要:

We study time-periodic forcing of spatially-extended patterns near a Turing-Hopf bifurcation point. A symmetry-based normal form analysis yields several predictions, including that (i) weak forcing near the intrinsic Hopf frequency enhances or suppresses the Turing amplitude by an amount that scales quadratically with the forcing strength, and (ii) the strongest effect is seen for forcing that is detuned from the Hopf frequency. To apply our results to specific models, we perform a perturbation analysis on general two-component reaction-diffusion systems, which reveals whether the forcing suppresses or enhances the spatial pattern. For the suppressing case, our results explain features of previous experiments on the CDIMA chemical reaction. However, we also find examples of the enhancing case, which has not yet been observed in experiment. Numerical simulations verify the predicted dependence on the forcing parameters.

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