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DY: Fachverband Dynamik und Statistische Physik

DY 30: Nonlinear stochastic systems

DY 30.6: Vortrag

Freitag, 29. Februar 2008, 11:30–11:45, MA 001

Noise-induced Nucleation in Spatially Extended Excitable Media — •Felix Müller — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin

We investigate the spontaneous noise-induced nucleation of dissipative structures. For this purpose we use the stochastic FitzHugh-Nagumo model in the excitable regime with diffusive coupling in one and two dimensions. The appearance of these structures like moving waves, stable wave segments or rotating spirals is well known from a wide range of complex systems. Famous examples are the Belousov-Zhabotinsky reaction or the intracellular calcium dynamics.

We explore the dependency of the mean nucleation time on the main features of the system as excitability, noise strength, and time scale separation and compare it with the scaling known from the analytical results in the limit of the local dynamics.