Two mechanisms of spiral-pair-source creation in excitable media

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...

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Bibliographic Details
Published in:Physics letters. A 2009-04, Vol.373 (20), p.1762-1767
Main Authors: Biton, Y., Rabinovitch, A., Aviram, I., Braunstein, D.
Format: Article
Language:English
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Summary: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.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2009.03.030