螺旋波的轨道运动
Orbital movement of spiral waves
摘要：
活跃介质中的螺旋波对小扰动的反应是粒子状物体。在这里，我们应用渐近理论的相互作用的螺旋波与局部的不均匀性，这导致了一个新的预测：漂移的螺旋旋转中心沿圆形轨道周围的不均匀性。静止轨道具有交替的稳定性和固定的半径，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取决于不均匀性的强度。直接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。
英文摘要：
Spiral waves in active media react to small perturbations as particle-like objects. Here we apply the asymptotic theory to the interaction of spiral waves with a localized inhomogeneity, which leads to a novel prediction: drift of the spiral rotation centre along circular orbits around the inhomogeneity. The stationary orbits have alternating stability and fixed radii, 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 simulations confirm the validity and robustness of the theoretical predictions and show that these unexpected effects should be observable in experiment.
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