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Extended Lagrangian approach for the defocusing Non-Linear Schrödinger equation

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Figure

Figure 1: Different shapes of the variables ρ and u for the ‘grey’ soliton solution, for different values of the parameters b 1 and b 3 at t = 0
Figure 3: Asymptotic profile of invariant r 2 for Whitham’s system. In the DSW region τ 2 < τ < τ 1 , r 2 (dashed line) varies while the other r i are constants.
Figure 4: The dispersion relation (42) (continous line) and (41) for the extended Lagrangian (dashed lines) for for β = 10 −4 and different values of λ.
Figure 5: Numerical profiles of ρ (left) and u (right) for the grey soliton at t = 0 (dot-dashed line) and at t = 2T (continuous line)
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