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  • Title: Threaded Rings that Swim in Excitable Media.
    Author: Cincotti A, Maucher F, Evans D, Chapin BM, Horner K, Bromley E, Lobb A, Steed JW, Sutcliffe P.
    Journal: Phys Rev Lett; 2019 Dec 20; 123(25):258102. PubMed ID: 31922769.
    Abstract:
    Cardiac tissue and the Belousov-Zhabotinsky reaction provide two notable examples of excitable media that support scroll waves, in which a filament core is the source of spiral waves of excitation. Here we consider a novel topological configuration in which a closed filament loop, known as a scroll ring, is threaded by a pair of counterrotating filaments that are perpendicular to the plane of the ring and end on the boundary of a thin medium. We simulate the dynamics of this threaded ring (thring) in the photosensitive Belousov-Zhabotinsky excitable medium, using the modified Oregonator reaction-diffusion equations. These computations reveal that the threading topology induces an exotic motion in which the thring swims in the plane of the ring. We propose a light templating protocol to create a thring in the photosensitive Belousov-Zhabotinsky medium and provide experimental confirmation that this protocol indeed yields a thring.
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