Fig. 5: Retracting piston experiment.
Rarefaction wave pair produced by an increasing input jump in frequency with ±Δf0 = 5.4 GHz, and power: (a) P0 = 165 mW (u0 = −0.63); (b) P0 = 35 mW (u0 = −1.37). c, d Simulations based on the NLSE. The dashed vertical lines stand for edge hydrodynamic velocities calculated from Eq. 7. The horizontal green line stands for ρiP0, with ρi from Eq. 4. The blue curves stand for the input super-Gaussian pulse profile on which we superimpose the stepwise chirp jump (see Methods for details).
