Figure 1

Upper panels: Snapshots of stages of the spontaneous creation of a vortex with a single pivot and S = 1 in the 2D setting, by the application of torque (5), with strength p = 80 and width W = 10, at t = 10, 50 and 250.

Here, |u(x,y)| is displayed, instead of local density |u(x,y)|², for better visibility of the peripheral area. Middle panel: The history of the formation of the orbiting vortex is shown by plotting the intensity-level plot corresponding to |u(x,y)|² = 3. Lower panel: The corresponding evolution of the norm. The drop of the norm at the initial stage is caused by elimination of the emitted radiation by the absorber.