Noise-induced wave nucleations in an excitable chemical reaction.
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.
Beato
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Technische Universität Berlin, Institut für Theoretische Physik, Hardenbergstrasse 36, D-10623, Berlin, Germany. valentina@davinci.physik.tu-berlin.de
Sendiña-Nadal
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Gerdes
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Engel
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