Sparse and dense spiral waves in heterogeneous excitable media

作者：Li Fang Dong^*; Zhan Guo Bai; Ya Feng He

来源：Acta Physica Sinica, 2012, 61(12): 120509.

• spiral waves
• localized inhomogeneity
• excitable media
• dynamics behaviors

Dynamic behaviors of sparse and dense spirals are investigated numerically based on a Barkley model in heterogeneous excitable media. It is found that the rotating frequency of sparse spiral wave decreases rapidly with b increasing and then tends to saturation, which is different from that of dense spiral wave. The period and wavelength of dense spiral wave increase with the increase of parameter E or the size R of localized inhomogeneity, which depends more sensitively on the size R than those of sparse sprial wave. The change of the speed of dense spiral wave tip with R is opposite to that of the sparse spiral wave tip. In addition, inhomogeneous effect gives rise to a defect point in arm of each of the two spiral waves when E or b increases above a critical value.

• 出版日期2012-6
• 单位河北大学