Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 49: Pattern Formation (joint session DY/BP)
DY 49.11: Vortrag
Donnerstag, 10. März 2016, 12:30–12:45, H46
Improvement of unpinning and termination of spiral waves by reducing excitability — •Jiraporn Luengviriya1, Malee Sutthiopad2, Metinee Phantu2, Porramain Porjai2, Jarin Kanchanawarin2, Stefan C. Müller3, and Chaiya Luengviriya2 — 1Department of Industrial Physics and Medical Instrumentation, King Mongkut's University of Technology North Bangkok, Thailand — 2Department of Physics, Kasetsart University, 50 Phaholyothin Road, Jatujak, Bangkok 10900, Thailand — 3Institute of Experimental Physics, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany
Spiral waves are common found in excitable systems. Such waves may drift and eventually annihilate at the boundary. However, they can be stabilized when pinned to obstacles. Spiral waves of electrical excitations in cardiac systems connect to some arrhythmias so that they should be eliminated. We present an investigation of the release of pinned spiral waves from unexcitable obstacles and the termination of free spiral waves at the boundary in a reaction-diffusion system. An advective field is applied as the external forcing. For a given obstacle size, the critical value of advection to release as well as that to terminate the spiral waves decrease when the excitability of the system is reduced. Therefore, this study shows that decreasing the excitability can facilitate elimination of spiral waves, either in the presence of obstacles or not.