Orbital Motion of Spiral Waves in Excitable Media
Orbital Motion of Spiral Waves in Excitable Media
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DOI：
10.1103/physrevlett.104.058302
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发表时间：
2010-02-05
影响因子：
8.6
通讯作者：
Biktasheva, I. V.
中科院分区：
文献类型：
--
作者：
Biktashev, V. N.;Barkley, D.;Biktasheva, I. V.
活跃介质中的螺旋波对微小扰动的反应就像粒子一样。在这里，我们应用渐近理论的相互作用的螺旋波的局部不均匀性，这导致了一个新的预测：漂移的螺旋旋转中心沿着圆形轨道周围的不均匀性。静止轨道具有固定的半径和交替的稳定性，这取决于体相介质的性质和不均匀性的类型，而沿轨道的漂移速度沿着取决于不均匀性的强度。直接数值模拟证实了理论预测的有效性和鲁棒性，并表明这些意想不到的效果应该在实验中观察到。
Spiral waves in active media react to small perturbations as particlelike objects. Here we apply asymptotic theory to the interaction of spiral waves with a localized inhomogeneity, which leads to a novel prediction: drift of the spiral rotation center along circular orbits around the inhomogeneity. The stationary orbits have fixed radii and alternating stability, determined by the properties of the bulk medium and the type of inhomogeneity, while the drift speed along an orbit depends on the strength of the inhomogeneity. Direct numerical simulations confirm the validity and robustness of the theoretical predictions and show that these unexpected effects should be observable in experiment.