Emission of a sound pulse following a vortex reconnection in a quantum fluid. The white line marks the reconnected vortex, the blue and red areas show density fluctuations.

From the article:

Irreversible Dynamics of Vortex Reconnections in Quantum Fluids
Alberto Villois, Davide Proment, and Giorgio Krstulovic
Phys. Rev. Lett. 125, 164501 (2020)

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