Scaling properties of invariant densities of coupled Tchebyscheff maps

Details Scaling properties of invariant densities of coupled Tchebyscheff maps Scaling properties of invariant densities of coupled Tchebyscheff maps

2006-09-21

arxiv.org/abs/nlin/0609052v2

Dyn. Sys. 22(2) (2007) 219-248

Nonlinear Sciences

Chaotic Dynamics

31 pages, including 19 encapsulated PostScript figures

Scientific paper

10.1080/14689360601173385

We study 1-dimensional coupled map lattices consisting of diffusively coupled Tchebyscheff maps of N-th order. For small coupling constants a we determine the invariant 1-point and 2-point densities of these nonhyperbolic systems in a perturbative way. For arbitrarily small couplings a>0 the densities exhibit a selfsimilar cascade of patterns, which we analyse in detail. We prove that there are log-periodic oscillations of the density both in phase space as well as in parameter space. We show that expectations of arbitrary observables scale with \sqrt{a} in the low-coupling limit, contrasting the case of hyperbolic maps where one has scaling with a. Moreover we prove that there are log-periodic oscillations of period \log N^2 modulating the \sqrt{a}-dependence of the expectation value of any given observable.

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