title: Regular wave propagation out of noise in chemical active media.
abstract: A pacemaker, regularly emitting chemical waves, is created out of noise when an excitable photosensitive Belousov-Zhabotinsky medium, strictly unable to autonomously initiate autowaves, is forced with a spatiotemporal patterned random illumination. These experimental observations are also reproduced numerically by using a set of reaction-diffusion equations for an activator-inhibitor model, and further analytically interpreted in terms of genuine coupling effects arising from parametric fluctuations. Within the same framework we also address situations of noise-sustained propagation in subexcitable media.
authors.affiliation: Departament de Química Física, Universitat de Barcelona, Avenida Diagonal 647, 08028 Barcelona, Spain. s.alonso@qf.ub.es
authors.forename: S
authors.initials: S
authors.lastname: Alonso
authors.forename: I
authors.initials: I
authors.lastname: Sendiña-Nadal
authors.forename: V
authors.initials: V
authors.lastname: Pérez-Muñuzuri
authors.forename: J M
authors.initials: JM
authors.lastname: Sancho
authors.forename: F
authors.initials: F
authors.lastname: Sagués