Vortex dynamics in a model of superflow: The role of acoustic excitations
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100 (Israel)
- Department of Physics, Bar-Ilan University, Ramat Gan 52900 (Israel)
In this paper we present numerical simulations for the dynamics of a vortex pair described by the two-dimensional nonlinear Schroedinger equation. The simulations reveal significant nonvanishing fluctuations around the classical velocities of vortices in an ideal incompressible fluid due to excitation of the acoustic (or sound) field. The reason for the fluctuations is the potentiality of the superflow, which introduces significant compressibility to the superfluid. We discuss some implications of this observation, especially on existing discrepancies between theories of superfluid turbulence. We indicate a possible mechanism for the spontaneous nucleation of a small vortex ring in the three-dimensional nonlinear Schroedinger equation.
- OSTI ID:
- 115847
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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