title: On the coarsening dynamics of a granular lattice gas.
abstract: We investigated experimentally and theoretically the dynamics of a driven granular gas on a square lattice and discovered two characteristic regimes: Initially, given the dissipative nature of the collisions, particles move erratically through the system and start to gather on selected sites called traps. Later on, the formation of those traps leads to a strong decrease of the grain mobility and slows down dramatically the dynamics of the entire system. We realize detailed measurements linking a trap's stability to the global evolution of the system and propose a model reproducing the entire dynamics of the system. Our work emphasizes the complexity of coarsening dynamics of dilute granular systems.
authors.affiliation: GRASP, Physics Department B5a, University of Liège, B-4000, Liège, Belgium. eric.opsomer@ulg.ac.be.
authors.forename: E
authors.initials: E
authors.lastname: Opsomer
authors.affiliation: GRASP, Physics Department B5a, University of Liège, B-4000, Liège, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Noirhomme
authors.affiliation: GRASP, Physics Department B5a, University of Liège, B-4000, Liège, Belgium.
authors.forename: F
authors.initials: F
authors.lastname: Ludewig
authors.affiliation: GRASP, Physics Department B5a, University of Liège, B-4000, Liège, Belgium.
authors.forename: N
authors.initials: N
authors.lastname: Vandewalle
keywords: Flowing Matter: Granular Matter