Figure 3
From: Creation of vortices by torque in multidimensional media with inhomogeneous defocusing nonlinearity
(Color online) Snapshots of the evolution ending up with the formation of the 2D vortex state with three pivots.
The pivots which are closest to the center, the middle one and farthest from the center, perform the orbital motion with angular velocities ω = +0.17, −0.44 and −0.48, respectively. Note that, on the contrary to the Keplerian motion, the angular velocity increases with the radius. This is explained by the fact that the centripetal force is provided here not by attraction to the center, but rather by the repulsion from the outer region.
