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Two mechanisms of spiral-pair-source creation in excitable media |
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| Authors: | Y Biton I Aviram |
| Institution: | a Physics Department Ben-Gurion University, Beer-Sheva 84105, Israel b Guest, Physics Department Ben-Gurion University, Beer-Sheva 84105, Israel c Physics Department Sami Shamoon College of Engineering, Beer-Sheva, Israel |
| Abstract: | Two new modes of generating spiral pairs in an excitable medium have been found. They depend on a geometrical structure (GS) inside the medium. This may be formed e.g. as a result of scars or fibrosis in the heart tissue, or artificially built in a chemical reaction substrate. Both sources involve a GS composed of a circular “convergent lens” bounded by two opaque “walls”. One mode can be induced by a single wave and behaves as a “flip-flop” type of a limit cycle. The other mode is generated by a train of plane waves impinging on the GS, and is created at the focus of the converging wave-fragments. |
| Keywords: | 87 19 Hh 87 19 Ug 87 10 -e 87 15 A- 52 35 Mw |
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