Vortex density waves and high-frequency second sound in superfluid turbulence hydrodynamics

TL;DR

This paper demonstrates that a hydrodynamical model of superfluid turbulence predicts vortex density waves and their impact on high-frequency second sound, revealing ondulatory vortex dynamics beyond diffusive behavior.

Contribution

It introduces the concept of vortex density waves affecting high-frequency second sound in superfluid turbulence, expanding understanding of vortex dynamics at different frequency regimes.

Findings

Vortex density waves exist at high frequencies in superfluid turbulence.

Ondulatory vortex behavior influences the propagation of second sound.

Vortex dynamics transition from diffusive to wave-like at high frequencies.

Abstract

In this paper we show that a recent hydrodynamical model of superfluid turbulence describes vortex density waves and their effects on the speed of high-frequency second sound. In this frequency regime, the vortex dynamics is not purely diffusive, as for low frequencies, but exhibits ondulatory features, whose influence on the second sound is here explored.