title: Formation and collision of traveling bands in interacting deformable self-propelled particles.
abstract: We study the collective dynamics of interacting deformable self-propelled particles whose migration velocity increases with increasing local density. In two-dimensional numerical simulations of this system, the local density dependence on migration velocity leads to traveling bands similar to those previously reported for Vicsek-type models. We show that a pair of straight bands moving in opposite directions survives a head-on collision. Although traveling bands also appear in systems of constant migration velocity subjected to random noise, they are found to be unstable in a head-on collision.
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan and Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan.
authors.forename: Sadato
authors.initials: S
authors.lastname: Yamanaka
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan and Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan and Soft Matter Center, Ochanomizu University, Tokyo 112-0012, Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Ohta