# The Fisher equation in the presence of an active boundary

#### The Fisher equation in the presence of an active boundary

- Event time: 11:30am
- Event date: 6th October 2010
- Speaker: Andre Costa (Formerly School of Physics & Astronomy, University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

The Fisher equation (or Fisher-Kolmogorov equation) is the prototypical equation for non-linear propagating wavefronts. As such it plays an important role in many biological, chemical and mechanical systems. Associated with the Fisher equation is a well-defined and easily calculated linear spreading velocity, i.e. the velocity by which a perturbation about the unstable state will propagate through the system. A driving force can be introduced into the system by adding an advection term to the equation. This advective term can be transformed away resulting only in a shift in the linear spreading velocity. However if introducing both advection and an active boundary, the advective velocity cannot simply be transformed away. As I will show, one has to take the stationary profile induced by the active boundary into account to fully understand the wave propagation.

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