Hopf dances near the tips of Busse balloons. (English) Zbl 1252.35032
This paper deals with stationary periodic patterns related with reaction-diffusion systems, in one spatial dimension, of the form
\[
\left\{\begin{aligned} \epsilon^2U_t&=U_{xx}-\epsilon^2\mu U+U^{\alpha_1}V^{\beta_1},\\ V_t&=\epsilon^2V_{xx}-V+U^{\alpha_2}V^{\beta_2}, \end{aligned}\right.\tag{1}
\]
with \(0<\epsilon\ll1\), \(\mu>0\), \(\alpha_2<0\), \(\beta_1>1\), \(\beta_2>1\), \(d=(\alpha_1-1)(\beta_2-1)-\alpha_2\beta_1>0\), known as the generalized Gierer-Meinhardt model.The associated Busse balloon is the region, in the wave number-parameter space, for which stable periodic patterns exist. The Hopf dance, near the tip of the Busse balloon is, first, graphically presented in the case of the Gray-Scott model (Sections 2–3). The results are generalized to system (1) in Sections 4–5. In the last section, possible extensions to larger classes of systems are discussed.
Reviewer: Denise Huet (Nancy)
MSC:
35B25 | Singular perturbations in context of PDEs |
35K57 | Reaction-diffusion equations |
37L15 | Stability problems for infinite-dimensional dissipative dynamical systems |
34L16 | Numerical approximation of eigenvalues and of other parts of the spectrum of ordinary differential operators |
35B36 | Pattern formations in context of PDEs |
35K45 | Initial value problems for second-order parabolic systems |
35K58 | Semilinear parabolic equations |