Quantum vortex reconnections

Zuccher, S., Caliari, M., Baggaley, A.W. and Barenghi, C.F. (2012) Quantum vortex reconnections. Physics of Fluids, 24(12), p. 125108. (doi: 10.1063/1.4772198)

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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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Baggaley, Dr Andrew
Authors: Zuccher, S., Caliari, M., Baggaley, A.W., and Barenghi, C.F.
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Physics of Fluids
Publisher:American Institute of Physics
Published Online:27 December 2012

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