Phase-rotors in an active medium
نویسنده
چکیده
Vortices of unusual form (rotating straight lines), phase-rotors, are found to occur in an active medium. Transitions between phase-rotors and Archimedian spiral waves are studied. The role of the dispersion relation in vortex development is discussed. Rotating nonlinear waves in active media have been attracting attention of the researchers during several decades. Such waves are found to occur in numerous physical, biological and chemical systems. The well documented examples are heart muscle and the BelousovZhabotinsky (BZ) reaction. Despite di erent physical nature, these systems have similar properties of active media (see, for example, ref.[1], where there is a comparison of dimensionless parameters of the heart tissue and the BZ reaction). Ever since vortices in the form of rotating Archimedian spirals were observed in the Belousov-Zhabotinsky reaction [2, 3, 4], these have been regarded as the only type of vortices
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