A bifurcating system subject to multiplicative noise can exhibit on–off intermittency close to the instability threshold. For a canonical system, we discuss the dependence of this intermittency on the Power Spectrum Density (PSD) of the noise. Our study is based on the calculation of the Probability Density Function (PDF) of the unstable variable. We derive analytical results for some particular types of noises and interpret them in the framework of on-off intermittency. Besides, we perform a cumulant expansion (N. G. van Kampen, 24, 171 (1976).) for a random noise with arbitrary power spectrum density and we show that the intermittent regime is controlled by the ratio between the departure from the threshold and the value of the PSD of the noise at zero frequency. Our results are in agreement with numerical simulations performed with two types of random perturbations: colored Gaussian noise and deterministic fluctuations of a chaotic variable. Extensions of this study to another, more complex, system are presented and the underlying mechanisms are discussed.
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PACS Number: 05.40.-a, 05.45.-a, 91.25.-r
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Aumaître, S., Mallick, K. & Pétrélis, F. Effects of the Low Frequencies of Noise on On–Off Intermittency. J Stat Phys 123, 909–927 (2006). https://doi.org/10.1007/s10955-006-9116-9
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DOI: https://doi.org/10.1007/s10955-006-9116-9