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• W1963484286 abstract "A superpersistent chaotic transient is characterized by the following scaling law for its average lifetime: $ensuremath{tau}ensuremath{sim}mathrm{exp}[C{(pensuremath{-}{p}_{c})}^{ensuremath{-}ensuremath{alpha}}]$, where $C>0$ and $ensuremath{alpha}>0$ are constants, $pensuremath{geqslant}{p}_{c}$ is a bifurcation parameter, and ${p}_{c}$ is its critical value. As $p$ approaches ${p}_{c}$ from above, the exponent in the exponential dependence diverges, leading to an extremely long transient lifetime. Historically the possibility of such transient raised the question of whether asymptotic attractors are relevant to turbulence. Here we investigate the phenomenon of noise-induced superpersistent chaotic transients. In particular, we construct a prototype model based on random maps to illustrate this phenomenon. We then approximate the model by stochastic differential equations and derive the scaling laws for the transient lifetime versus the noise amplitude $ensuremath{epsilon}$ for both the subcritical $(p<{p}_{c})$ and the supercritical $(p>{p}_{c})$ cases. Our results are the following. In the subcritical case where a chaotic attractor exists in the absence of noise, noise-induced transients can be more persistent in the following sense of double-exponential and algebraic scaling: $ensuremath{tau}ensuremath{sim}mathrm{exp}[{K}_{0}phantom{rule{0.2em}{0ex}}mathrm{exp}({K}_{1}{ensuremath{epsilon}}^{ensuremath{-}ensuremath{gamma}})]$ for small noise amplitude $ensuremath{epsilon}$, where ${K}_{0}>0$, ${K}_{1}>0$, and $ensuremath{gamma}>0$ are constants. The longevity of the transient lifetime in this case is striking. For the supercritical case where there is already a superpersistent chaotic transient, noise can significantly reduce the transient lifetime. These results add to the understanding of the interplay between random and deterministic chaotic dynamics with surprising physical implications." @default.
• W1963484286 created "2016-06-24" @default.
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• W1963484286 date "2005-04-15" @default.
• W1963484286 modified "2023-10-18" @default.
• W1963484286 title "Scaling laws for noise-induced superpersistent chaotic transients" @default.
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• W1963484286 doi "https://doi.org/10.1103/physreve.71.046208" @default.
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