Min-Max formulae for the speeds of pulsating travelling fronts in periodic excitable media

Details Min-Max formulae for the speeds of pulsating travelling fronts in periodic excitable media Min-Max formulae for the speeds of pulsating travelling fronts in periodic excitable media

2009-09-05

arxiv.org/abs/0909.0986v1

Annali di Mathematica Pura ed Applicata, (2010), Volume 189, Issue 1, pp: 47-66

Mathematics

Analysis of PDEs

Scientific paper

This paper is concerned with some nonlinear propagation phenomena for reaction-advection-diffusion equations in a periodic framework. It deals with travelling wave solutions of the equation $$u_t =\nabla\cdot(A(z)\nabla u) +q(z)\cdot\nabla u+ f(z,u), t \in \mathbb{R}, z \in \Omega,$$ propagating with a speed $c.$ In the case of a "combustion" nonlinearity, the speed $c$ exists and it is unique, while the front $u$ is unique up to a translation in $t.$ We give a $\min-\max$ and a $\max-\min$ formula for this speed $c.$ On the other hand, in the case of a "ZFK" or a "KPP" nonlinearity, there exists a minimal speed of propagation $c^{*}.$ In this situation, we give a $\min-\max$ formula for $c^{*}.$ Finally, we apply this $\min-\max$ formula to prove a variational formula involving eigenvalue problems for the minimal speed $c^{*}$ in the "KPP" case.

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