title: Noise-induced wave nucleations in an excitable chemical reaction.
abstract: We study both experimentally and numerically the temporal coherence of noise-induced wave nucleations in excitable media subjected to external fluctuations with finite correlation time. The experiments are performed with the light-sensitive variant of the Belousov-Zhabotinsky (BZ) reaction forced by an exponentially correlated dichotomous fluctuating illumination. We find that there exists an optimal correlation time for which nucleations coherence reaches a maximum. The same behavior is obtained in numerical simulations with a stochastic Oregonator model, modified to describe the light-sensitive BZ reaction.
authors.affiliation: Technische Universität Berlin, Institut für Theoretische Physik, Hardenbergstrasse 36, D-10623, Berlin, Germany. valentina@davinci.physik.tu-berlin.de
authors.forename: V
authors.initials: V
authors.lastname: Beato
authors.forename: I
authors.initials: I
authors.lastname: Sendiña-Nadal
authors.forename: I
authors.initials: I
authors.lastname: Gerdes
authors.forename: H
authors.initials: H
authors.lastname: Engel