Stabilizing Spiral and Spatiotemporal Chaos in External Centric Field

In this paper, a scheme of spatial perturbation is introduced into a class of excitable media, which are describedby two-dimensional partial-differential equation models. Inertial acentric force (or centripetal force), which is generated by circumgyrating the whole system vs. a right axis, is used todisturb the system. The whole system becomes homogeneous as soonas the spatial perturbation is imposed on even when the noise is in consideration. The principle of this scheme is confirmed based on the theory of Hopf bifurcation and numerical simulation.