Origin and evolution of the multiply quantized vortex instability

We show that the dynamical instability of quantum vortices with more than a single unit circulation results from superradiant bound state inside vortex core. then reveal striking behavior system in nonlinear regime. Counter to expectation should produce well-separated vortices, evolves into corotating singularities orbiting within few healing lengths each other, undergoing modulations separation. During these modulations, kinetic energy is traded back and forth between sound waves vortical degrees freedom.