Irreversible Dynamics of Vortex Reconnections in Quantum Fluids


We statistically study vortex reconnections in quantum fluids by evolving different realizations of vortex Hopf links using the Gross–Pitaevskii model. Despite the time reversibility of the model, we report clear evidence that the dynamics of the reconnection process is time irreversible, as reconnecting vortices tend to separate faster than they approach. Thanks to a matching theory devised concurrently by Proment and Krstulovic [Phys. Rev. Fluids 5, 104701 (2020)], we quantitatively relate the origin of this asymmetry to the generation of a sound pulse after the reconnection event. Our results have the prospect of being tested in several quantum fluid experiments and, theoretically, may shed new light on the energy transfer mechanisms in both classical and quantum turbulent fluids.

Phys. Rev. Lett. 125, 164501 (2020). Selected for the PRL’s Cover

The figure shows a density pulse emitted during a reconnection process. This work is complemented by an extensive theoretical study that can be found here.

For a movie showing the full evolution of the vortices go the News section or click here!