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Irreversible Dynamics of Vortex Reconnections in Quantum Fluids.

Alberto Villois1, Davide Proment2, Giorgio Krstulovic3

  • 1Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom and School of Mathematics, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.

Physical Review Letters
|October 30, 2020
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Summary
This summary is machine-generated.

Vortex reconnections in quantum fluids show time-irreversible dynamics, separating faster than approaching. This asymmetry is linked to sound pulse generation, offering insights into turbulent energy transfer.

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Area of Science:

  • Quantum fluid dynamics
  • Turbulence theory
  • Vortex dynamics

Background:

  • Vortex reconnections are fundamental in fluid dynamics.
  • Understanding their dynamics is crucial for turbulence.
  • Quantum fluids offer a unique system to study these phenomena.

Purpose of the Study:

  • To investigate the statistical properties of vortex reconnections in quantum fluids.
  • To determine if vortex reconnection dynamics are time-reversible.
  • To identify the physical mechanisms driving any observed irreversibility.

Main Methods:

  • Statistical analysis of vortex reconnections.
  • Numerical simulations using the Gross-Pitaevskii model.
  • Evolution of various vortex Hopf link configurations.

Main Results:

  • Vortex reconnection dynamics were found to be time-irreversible.
  • Reconnecting vortices separate significantly faster than they approach.
  • This asymmetry was quantitatively linked to the generation of a sound pulse post-reconnection.

Conclusions:

  • The study provides evidence for time-irreversible vortex reconnection in quantum fluids.
  • Sound pulse generation is identified as a key factor in this asymmetry.
  • Findings may advance understanding of energy transfer in classical and quantum turbulence.