Kelvin-Wave Cascade and Decay of Superfluid Turbulence
Kelvin-Wave Cascade and Decay of Superfluid Turbulence
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 …