Knots and links often occur in physical systems, idoi:10.1038/NPHYS3679KauffmanUnivLouisUnivH.UnivIrvineUnivWilliamUnivT.UnivM.UnivKlecknerUnivDustinUnivNature PhysicsDustin Kleckner, Louis Kauffman, and William Irvine, How superfluid vortex knots untie, Nature Physics 12 (2015)....
To understand how this untying works, we simulate the behavior of 1,458 superfluid vortex knots of varying complexity and scale in the Gross-Pitaevskii equation. Without exception, we find that the knots untie efficiently and completely, and do so within a predictable time range. We also ...