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Quantum vortex reconnections

Lookup NU author(s): Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi

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Abstract

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]

Publication metadata

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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