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Vortex Reconnection and Acoustic Emission by the Numerical Analysis of the Gross-Pitaevskii Equation

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Abstract

Reconnection of quantized vortices and concurrent acoustic emission are studied numerically by analyzing the Gross-Pitaevskii equation. Although vortex reconnection was studied earlier by Koplik and Levine, the present work first investigates in more detail how the singular vortex cores reconnect. Second, acoustic emission, i.e., the emission of the density waves of the condensate, is studied when two vortices annihilate or reconnect. The local drastic change of the condensate density is found to work as an acoustic source to emit the density waves. This phenomenon may be related to the vortex tangle decay observed at mK temperatures and the eddy viscosity which is thought to be an intrinsic dissipative mechanism in a vortex tangle.

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Authors and Affiliations

  1. Department of Physics, Osaka City University, Osaka, 558-8585, Japan

    Makoto Tsubota & Shin-ichiro Ogawa

  2. Department of Computer Aided Science, Kyusyu Institute of Technology, Sensui 1-1, Tobata-ku, Kitakyushu, 804-8550, Japan

    Yuji Hattori

Authors
  1. Makoto Tsubota
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  2. Shin-ichiro Ogawa
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  3. Yuji Hattori
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Tsubota, M., Ogawa, Si. & Hattori, Y. Vortex Reconnection and Acoustic Emission by the Numerical Analysis of the Gross-Pitaevskii Equation. Journal of Low Temperature Physics 121, 435–440 (2000). https://doi.org/10.1023/A:1017562016052

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  • DOI: https://doi.org/10.1023/A:1017562016052

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