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Published on: September 5, 2018
Kelvin-wave cascade and decay of superfluid turbulence
Evgeny Kozik1, Boris Svistunov
1Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Abstract:
Kelvin waves (kelvons), the distortion waves on vortex lines, play a key part in the relaxation of superfluid turbulence at low temperatures. We present a weak-turbulence theory of kelvons. We show that nontrivial kinetics arises only beyond the local-induction approximation and is governed by three-kelvon collisions; a corresponding kinetic equation is derived. We prove the existence of Kolmogorov cascade and find its spectrum. The qualitative analysis is corroborated by numeric study of the kinetic equation. The application of the results to the theory of superfluid turbulence is discussed.
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