STATIC CHAOS IN SPIN-GLASSES - THE CASE OF QUENCHED DISORDER PERTURBATIONS

We study the chaotic nature of spin glasses against perturbations of t he realization of the quenched disorder. This type of perturbation mod ifies the energy landscape of the system without adding extensive ener gy. We exactly solve the mean-field case, which displays a very simila r chaos to that observed under magnetic field perturbations, and discu ss the possible extension of these results to the case of short-ranged models. It appears that dimension four plays the role of a specific c ritical dimension where mean-field theory is valid. We present numeric al simulation results which support our main conclusions.