Numerical study of the oscillatory convergence to the attractor at the edge of chaos

Abstract

This paper compares three different types of “onset of chaos” in the logistic and generalized logistic map: the Feigenbaum attractor at the end of the period doubling bifurcations; the tangent bifurcation at the border of the period three window; the transition to chaos in the generalized logistic with inflection 1/2 (x n+1 =1-μx n 1/2 ), in which the main bifurcation cascade, as well as the bifurcations generated by the periodic windows in the chaotic region, collapse in a single point. The occupation number and the Tsallis entropy are studied. The different regimes of convergence to the attractor, starting from two kinds of far-from-equilibrium initial conditions, are distinguished by the presence or absence of log-log oscillations, by different power-law scalings and by a gap in the saturation levels. We show that the escort distribution implicit in the Tsallis entropy may tune the log-log oscillations or the crossover times. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 200605.10.-a Computational methods in statistical physics and nonlinear dynamics, 05.45.-a Nonlinear dynamics and nonlinear dynamical systems, 05.45.Pq Numerical simulations of chaotic systems ,