Kelvin waves, mutual friction, and fluctuations in the Gross-Pitaevskii model

Abstract

In this work we first briefly review some of the mutual friction effects on vortex lines and rings that were obtained in the context of the truncated Gross-Pitaevskii equation in references Krstulovic \& Brachet [Phys.~Rev.~E \textbf{83}(6), 066311 and Phys.~Rev.~B \textbf{83}132506 (2011)], with particular attention to the anomalous slowdown of rings produced by thermally excited Kelvin waves. We then study the effect of mutual friction on the relaxation and fluctuations of Kelvin waves on straight vortex lines by comparing the results of full $3D$ direct simulations of the truncated Gross-Pitaevskii equation with a simple stochastic Local-Induction-Approximation model with mutual friction and thermal noise included. This new model allows us to determine the mutual friction coefficient $\alpha$ and ${\alpha }^{\prime }$ for the truncated Gross-Pitaevskii equation.

References in corpus (8)

• Finite Temperature Models of Bose-Einstein Condensation
• Dissipative dynamics of superfluid vortices at non-zero temperatures
• Anomalous translational velocity of vortex ring with finite-amplitude Kelvin waves
• Friction-enhanced lifetime of bundled quantum vortices
• Critical velocity for vortex nucleation and roton emission in a generalized model for superfluids
• Kolmogorov and Kelvin wave cascades in a generalized model for quantum turbulence
• Stochastic Gross-Pitaevsky Equation for BEC via Coarse-Grained Effective Action
• Stochastic motion of finite-size immiscible impurities in a dilute quantum fluid at finite temperature

Cited by in corpus (1)

• Quantum vortex driven Kelvin wave in the thermal background of superfluid helium