Transport aspects in anomalous diffusion: Lévy walks
- 1 October 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 40 (7), 3964-3973
- https://doi.org/10.1103/physreva.40.3964
Abstract
In this paper we present a combined analytical and numerical study of transport properties of Lévy walks. Here, within the framework of continuous-time random walks (CTRW’s) with coupled memories, we focus on the probability (t) of being at the initial site at time t and on S(t), the mean number of distinct sites visited in time t. We use the connection between (t) and S(t), which are related via their Laplace transform, and we reanalyze our previous findings for 〈(t)〉, the mean-squared displacement. Furthermore, S(t) shows, as a function of the memory parameters, a very interesting, nonuniversal, nonmonotonic behavior, which we corroborate by numerical simulations in one dimension. We compare the findings with those for decoupled CTRW’s on regular lattices and on fractals.
Keywords
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