title: Density wave propagation of a wave train in a closed excitable medium.
abstract: A wave train in an excitable reaction-diffusion medium shows a variety of spatiotemporal patterns as a result of interactions between the individual waves. In this paper, we report a novel spatiotemporal pattern in a wave train in a closed excitable medium. We carried out experiments using a photosensitive Belousov-Zhabotinsky reaction with Ru(bpy)(3)(2+) as a catalyst and a numerical calculation using the FitzHugh-Nagumo equation. A wave train was locally distributed as an initial condition and the number of waves was systematically varied. In both the experiment and numerical calculation, density wave propagation was formed in a wave train during relaxation with a large number of waves. Our results suggest that density wave propagation originates from inhibitory interaction between the waves.
authors.affiliation: Graduate School of Advanced Mathematical Sciences, Meiji University, 1-1-1 Higashimita, Tamaku, Kawasaki 214-8571, Japan. suematsu@meiji.ac.jp
authors.forename: Nobuhiko J
authors.initials: NJ
authors.lastname: Suematsu
authors.forename: Taisuke
authors.initials: T
authors.lastname: Sato
authors.forename: Ikuko N
authors.initials: IN
authors.lastname: Motoike
authors.forename: Kenji
authors.initials: K
authors.lastname: Kashima
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakata