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Lookup NU author(s): Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi
We study reconnections of quantum vortices by numerically solving the governing Gross-Pitaevskii equation. We find that the minimum distance between vortices scales differently with time before and after the vortex reconnection. We also compute vortex reconnections using the Biot-Savart law for vortex filaments of infinitesimal thickness, and find that, in this model, reconnections are time symmetric. We argue that the likely cause of the difference between the Gross-Pitaevskii model and the Biot-Savart model is the intense rarefaction wave which is radiated away from a Gross-Pitaeveskii reconnection. Finally we compare our results to experimental observations in superfluid helium and discuss the different length scales probed by the two models and by experiments. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772198]
Author(s): Zuccher S, Caliari M, Baggaley AW, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physics of Fluids
Year: 2012
Volume: 24
Issue: 12
Print publication date: 27/12/2012
Date deposited: 09/04/2014
ISSN (print): 1070-6631
ISSN (electronic): 1089-7666
Publisher: American Institute of Physics
URL: http://dx.doi.org/10.1063/1.4772198
DOI: 10.1063/1.4772198
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