Fig. 1.
Growth of the instability in the supercritical (Left) and subcritical cases (Right). The three lines correspond to three successive times. A small perturbation around ρ0 (red line) growth toward harmonic or anharmonic patterns in the supercritical or subcritical case, respectively. (Left) Supercritical case (α = κ = 0.01, λ = 0.02, ρ0 = 15, ; times: 102, 103, 104). (Right) Subcritical case (α = κ = 0.005, λ = 0.02, ρ0 = 11,
; times: 3.102, 3.103, 105).