Effect of noise on critical behaviorof different universality classes at the chaos threshold |

In studies of transitions to chaos in the context of physical systems a question of effect of an inevitable noise is of principal significance as the noise destroys subtle details of fractal structures in state space and in parameter space, formation of which is just the essence of the transition.

The idea of application of the renormalization group nethod for analysis of the effect of noise at the chaos threshold was suggested first in two articles published in the same issue of Physical Review Letters in 1981. (J.P.Crutchfield, M.Nauenberg, and J.Rudnik, and B.Shraiman, C.E.Wayne, and P.C.Martin). Both of them relate to the problem of the period doubling transition to chaos in discrete-time models (iterative maps). The authors introduced a new universal constant, which indicates how many times less should one select the noise intensity to observe one more level of the fractal-like structure associated with the period-doubling transition at the onset of chaos. Afterwards analogous approaches were elaborated by many authors for some other types of behavior at the onset of chaos or strange nonchaotic attractor.

The present section of our web-site contains results of the
renormalization group analysis and illustrations of scaling properties
associated with effect of noise for several types of criticality.
It has been prepared in a course of work supported by joint project of DFG
and RFBR

- Effect of noise on the Feigenbaum transition
- Effect of noise on the golden-mean quasiperiodicity at the chaos threshold
- Effect of noise on the period-tripling
- Effect of noise on the torus doubling terminal criticality

of theoretical nonlinear

dynamics

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