title: Discretized diffusion processes
abstract: We study the properties of the "rigid Laplacian" operator; that is we consider solutions of the Laplacian equation in the presence of fixed truncation errors. The dynamics of convergence to the correct analytical solution displays the presence of a metastable set of numerical solutions, whose presence can be related to granularity. We provide some scaling analysis in order to determine the value of the exponents characterizing the process. We believe that this prototype model is also suitable to provide an explanation of the widespread presence of power law in a social and economic system where information and decision diffuse, with errors and delay from agent to agent.
authors: INFM Sezione di ROMA1 Dipartimento Fisica, Universita di Roma "La Sapienza," Piazzale Aldo Moro 2, 00185 Roma, Italy.
authors: S
authors: Ciliberti
authors: G
authors: Caldarelli
authors: De Los Rios P
authors: L
authors: Pietronero
authors: YC
authors: Zhang