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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonlinear stochastic systems
DY 30.1: Talk
Friday, February 29, 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).