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Cylindrically symmetric travelling fronts in a periodic reaction-diffusion equation with bistable nonlinearity. (English) Zbl 1439.35278

Summary: This paper is concerned with the existence, non-existence and qualitative properties of cylindrically symmetric travelling fronts for time-periodic reaction-diffusion equations with bistable nonlinearity in \(\mathbb R^ m\) with \(m \geq 2\). It should be mentioned that the existence and stability of two-dimensional time-periodic V-shaped travelling fronts and three-dimensional time-periodic pyramidal travelling fronts have been studied previously. In this paper we consider two cases: the first is that the wave speed of a one-dimensional travelling front is positive and the second is that the one-dimensional wave speed is zero. For both cases we establish the existence, non-existence and qualitative properties of cylindrically symmetric travelling fronts. In particular, for the first case we furthermore show the asymptotic behaviours of level sets of the cylindrically symmetric travelling fronts.

MSC:

35K57 Reaction-diffusion equations
35C07 Traveling wave solutions
35B10 Periodic solutions to PDEs
35B08 Entire solutions to PDEs
92D25 Population dynamics (general)
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