Refraction of waves in excitable media
نویسندگان
چکیده
Waves in chemically excitable systems can refract when impinging on an interface between regions of different reaction kinetics and/or diffusion constants. Here we study this process using the thin reaction-zone limit wherein the dynamics of the system can be reduced to the tracking of the boundaries between quiescent and excited regions. We show how to derive an integrodifferential equation for the refraction of a single pulse and we subsequently solve this equation numerically. Our results predict that there can be an oscillatory recovery to the asymptotic ~far from the interface! pulse; this could be checked by experiments on the Belousov-Zhabotinskii reaction. @S1063-651X~98!09309-X#
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