DYNAMIC FRONT TRANSITIONS AND SPIRAL-VORTEX NUCLEATION
Christian Elphick 1,
Aric Hagberg 2,
and Ehud Meron 3
1 Department of Physics, Universidad Técnica Federico
Santa Maria, Valparaiso, Casilla 110-V, Chile
2 Center for Nonlinear Studies, Theortical Division,
Los Alamos National Laboratory, Los Alamos, NM 87545
3 Department of Mathematics and ACMS, University of Arizona, Tucson, AZ 85721
Physical Review E 51(4) April 1995
This is a study of front dynamics in reaction diffusion systems near
Nonequilibrium Ising-Bloch bifurcations. We find that the
relation between front velocity and perturbative factors, such as
external fields and curvature, is typically multivalued. This unusual
form allows small perturbations to induce dynamic transitions
between counter-propagating fronts and nucleate spiral vortices.
We use these findings to propose explanations for two experimental
observations: Spiral breakup driven by convection, and spot splitting.
PACS numbers: 05.45.+b,82.20.Mj
The entire document (with figures)
Aric Hagberg <aric@lanl.gov>
Last modified: Wed Dec 17 11:17:40 MST 1997