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DY: Dynamik und Statistische Physik

DY 42: Synchronisation I

DY 42.5: Vortrag

Donnerstag, 27. März 2003, 12:00–12:15, G\"OR/226

Oscillatory Dispersion and Coexisting Stable Pulse Trains in an Excitable Medium — •Grigori Bordiougov and Harald Engel — Institute for Theoretical Physics, Sekr. PN 7-1, TU Berlin, Hardenbergstr. 36, D 10623 Berlin

For planar wave trains in excitable media we found a novel type of anomalous dispersion distinguished by bistable domains in the dependence of the propagation velocity on the wavelength. Within one medium alternative stable pulse trains can coexist having the same wavelength but different velocities. The phenomenon is related to oscillatory recovery of excitations which causes small amplitude oscillations in the refractory tail of pulses. Crucial for the bistability is that the pulses in the trains are locked into one oscillation maximum in the tail of the preceeding pulse in the train.