Propagation failure of traveling waves in a discrete bistable medium

Details Propagation failure of traveling waves in a discrete bistable medium Propagation failure of traveling waves in a discrete bistable medium

1997-11-20

arxiv.org/abs/patt-sol/9711003v1

Nonlinear Sciences

Pattern Formation and Solitons

8 pages, 6 eps figures, to appear in Physica D

Scientific paper

10.1016/S0167-2789(97)00251-0

Propagation failure (pinning) of traveling waves is studied in a discrete scalar reaction-diffusion equation with a piecewise linear, bistable reaction function. The critical points of the pinning transition, and the wavefront profile at the onset of propagation are calculated exactly. The scaling of the wave speed near the transition, and the leading corrections to the front shape are also determined. We find that the speed vanishes logarithmically close to the critical point, thus the model belongs to a different universality class than the standard Nagumo model, defined with a smooth, polynomial reaction function.

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