Two-dimensional dissipative maps at chaos threshold: sensitivity to initial conditions and relaxation dynamics

Abstract

The sensitivity to initial conditions and relaxation dynamics of two-dimensional maps are analyzed at the edge of chaos, along the lines of nonextensive statistical mechanics. We verify the dual nature of the entropic index for the Henon map, one ( q sen <1) related to its sensitivity to initial condition properties, and the other, graining-dependent ( q rel ( W)>1), related to its relaxation dynamics towards its stationary state attractor. We also corroborate a scaling law between these two indices, previously found for z-logistic maps. Finally, we perform a preliminary analysis of a linearized version of the Henon map (the smoothed Lozi map). We find that the sensitivity properties of all these z-logistic, Henon and Lozi maps are the same, q sen =0.2445….