Eur. Phys. J. B 58, 323-329 (2007)
https://doi.org/10.1140/epjb/e2007-00228-x

Pulse trains propagating through excitable media subjected to external noise

¹ Technische Universität Berlin, Institut für Theoretische Physik, Hardenbergstr. 36, 10623, Berlin, Germany
² Università “La Sapienza” di Roma, P.le Aldo Moro 2, 00185 Roma, Italy
³ Humboldt-Universität zu Berlin, Institut für Physik, Invalidenstr. 110, 10115 Berlin, Germany

Corresponding author: ^a valentina.beato@roma1.infn.it

Received: 9 January 2007
Revised: 17 July 2007
Published online: 8 September 2007

Abstract

We study the propagation of periodic pulse trains in excitable media exposed to external spatio-temporal noise using the light-sensitive Belousov-Zhabotinsky reaction with the underlying Oregonator model as representative example. In the weak noise approximation we find noise-induced transitions in the dispersion relation of pulse trains. We discuss noise-enhanced propagation of pulse trains within a certain wave-length range caused by external noise of moderate strength.