Spiral breakup due to mechanical deformation in excitable media.
To address the problem of how cardiac muscle contraction affects the dynamics of rotating spiral waves, spiral breakup induced by mechanical deformation in excitable media is studied in two partial-differential-equation models. It is shown that spirals begin to break up at omega=0.5 omega(0) when we increase the amplitude of the mechanical deformation gradually. Our numerical results point to a new mechanism of transition from spirals to spatiotemporal chaos, in which the anisotropic time-dependent diffusion coefficient is essential.
Zhang
Hong
H
Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, China. hzhang@zimp.zju.edu.cn
Ruan
Xiao-Sheng
XS
Hu
Bambi
B
Ouyang
Qi
Q