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DY: Fachverband Dynamik und Statistische Physik

DY 7: Reaction-Diffusion-Systems

DY 7.1: Vortrag

Montag, 26. März 2012, 16:45–17:00, MA 144

Influence of boundaries on the intrinsic dynamics of excitation waves — •Jan Frederik Totz¹, Oliver Steinbock², and Harald Engel¹ — ¹Institut für Theoretische Physik, TU Berlin, Hardenbergstr. 36, EW 7-1, D-10623 — ²Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL-32306-4390

Three-dimensional excitation waves are thought to play a fundamental role in serious cardiac diseases such as tachycardia and fibrillation. We employ the well-studied Belousov-Zhabotinsky-Reaction as a chemical model system to investigate the altered dynamics of scrollrings close to boundaries, using an experimental setup as described in [1]. We observed four different scenarios of the scrollring evolution dependent upon the distance to the nearest zero-flux boundary: Annihilation at the boundary, weakly & strongly boundary-affected scrollring contraction rates and even vanishingly small contraction. The experimental findings are in good agreement with previous numerical results [2].

[1] Z. A. Jiménez, B. Marts, O. Steinbock, Phys. Rev. Lett. 102, 244101 (2009)

[2] M. Bray, J.P. Wikswo, Phys. Rev. Lett. 90, 23 (2003)