title: Complex statistics and diffusion in nonlinear disordered particle chains.
abstract: We investigate dynamically and statistically diffusive motion in a Klein-Gordon particle chain in the presence of disorder. In particular, we examine a low energy (subdiffusive) and a higher energy (self-trapping) case and verify that subdiffusive spreading is always observed. We then carry out a statistical analysis of the motion, in both cases, in the sense of the Central Limit Theorem and present evidence of different chaos behaviors, for various groups of particles. Integrating the equations of motion for times as long as 10(9), our probability distribution functions always tend to Gaussians and show that the dynamics does not relax onto a quasi-periodic Kolmogorov-Arnold-Moser torus and that diffusion continues to spread chaotically for arbitrarily long times.
authors.affiliation: Institute for Complex Systems and Mathematical Biology (ICSMB), Department of Physics, University of Aberdeen, AB24 3UE Aberdeen, United Kingdom.
authors.forename: Ch G
authors.initials: ChG
authors.lastname: Antonopoulos
authors.affiliation: Center for Research and Applications of Nonlinear Systems (CRANS), Department of Mathematics, University of Patras, 26500 Patras, Greece.
authors.forename: T
authors.initials: T
authors.lastname: Bountis
authors.affiliation: Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch, Cape Town 7701, South Africa.
authors.forename: Ch
authors.initials: Ch
authors.lastname: Skokos
authors.affiliation: High Performance Computing Systems Lab (HPCS lab), Department of Computer and Informatics Engineering, Technological Educational Institute of Western Greece, 30300 Antirion, Greece.
authors.forename: L
authors.initials: L
authors.lastname: Drossos