title: Relaxation of isolated quantum systems beyond chaos.
abstract: In classical statistical mechanics there is a clear correlation between relaxation to equilibrium and chaos. In contrast, for isolated quantum systems this relation is--to say the least--fuzzy. In this work we try to unveil the intricate relation between the relaxation process and the transition from integrability to chaos. We study the approach to equilibrium in two different many-body quantum systems that can be parametrically tuned from regular to chaotic. We show that a universal relation between relaxation and delocalization of the initial state in the perturbed basis can be established regardless of the chaotic nature of system.
authors: Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR, CONICET), Universidad Nacional de Mar del Plata, Mar del Plata, Argentina and Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Argentina.
authors: Ignacio
authors: I
authors: García-Mata
authors: Departamento de Física "J. J. Giambiagi" and IFIBA, FCEyN, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina.
authors: Augusto J
authors: AJ
authors: Roncaglia
authors: Departamento de Física "J. J. Giambiagi" and IFIBA, FCEyN, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina.
authors: Diego A
authors: DA
authors: Wisniacki