Threaded Rings that Swim in Excitable Media

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  • Antonio Cincotti, Durham University, Storbritannien
  • Fabian Marcus Benjamin M J Maucher
  • David Evans, Durham University, Storbritannien
  • Brette M. Chapin, Durham University, Storbritannien
  • Kate Horner, Durham University, Storbritannien
  • Elizabeth Bromley, Durham University, Storbritannien
  • Andrew Lobb, Durham University, Storbritannien
  • Jonathan W. Steed, Durham University, Storbritannien
  • Paul Sutcliffe, Durham University, Storbritannien
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.
TidsskriftPhysical Review Letters
StatusUdgivet - dec. 2019

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