title: Nonequilibrium ribbon model of twisted scroll waves.
abstract: We formulate a reduced model to analyze the motion of the core of a twisted scroll wave. The model is first shown to provide a simple description of the onset and nonlinear evolution of the helical state appearing in the sproing bifurcation of scroll waves. It then serves to examine the experimentally studied case of a medium with spatially varying excitability. The model shows the role of sproing in this more complex setting and highlights the differences between the convective and absolute sproing instabilities.
authors.affiliation: Departament de Física Aplicada, Universitat Politècnica de Catalunya, Doctor Marañón 44, E-08028 Barcelona, Spain.
authors.forename: Blas
authors.initials: B
authors.lastname: Echebarria
authors.forename: Vincent
authors.initials: V
authors.lastname: Hakim
authors.forename: Hervé
authors.initials: H
authors.lastname: Henry
mesh_terms: D004247:DNA / Q000737:chemistry; D008962:Models, Theoretical; D014693:Ventricular Fibrillation
chemical_list: D004247:DNA