REFRACTION OF ACTIVE WAVES IN REACTION-DIFFUSION MEDIA

The refraction of active waves is analyzed for a stable-metastable rea ction-diffusion system consisting of two regions with different diffus ion coefficients. The equations governing the evolution of wavefronts are derived by means of an asymptotic perturbation method for boundary layers. These equations describe non-stationary refraction near the s teady state regime. It is shown that the dynamics of wavefronts separa tes into that in the region near the boundary and that far from the bo undary.