LINEAR RESPONSE OF TWO-DIMENSIONAL AREA-PRESERVING MAPS
This work was supported by the Swiss National Science Foundation.
The linear response of a completely chaotic map to a particularly chosen constant perturbation has been calculated analytically. In the infinite-time limit, it is compared with the full nonlinear response. All physically relevant observables relax to the asymptotic value, some of them after a single time step; one of the explicitly calculated observables shows exponential relaxation with a relaxation time related to the Lyapunov exponent of the unperturbed map.