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DY: Fachverband Dynamik und Statistische Physik

DY 30: Nonlinear stochastic systems

DY 30.1: Vortrag

Freitag, 29. Februar 2008, 10:15–10:30, MA 001

Increase of Coherence in Excitable Systems by Delayed Feedback — Tobias Prager¹, Hans-P. Lerch¹, •Lutz Schimansky-Geier¹, and Eckehard Schöll² — ¹Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin — ²Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin

The control of coherence and spectral properties of noise-induced oscillations by time-delayed feedback is studied in a FitzHugh-Nagumo system which serves as a paradigmatic model of excitable systems. A semianalytical approach based on a discrete model with waiting time densities is developed which allows one to predict quantitatively the increase of coherence measured by the correlation time, and the modulation of the main frequencies of the stochastic dynamics in dependence on the delay time. The analytical mean-field approximation is in good agreement with numerical results for the full nonlinear model.

Literature: Prager, T., Lerch, H. -P., Schimansky-Geier, L., and Schöll, E. "Increase of coherence in excitable systems by delayed feedback", J. Phys. A: Math. Theor. 40, 11045 (2007).