Reconnection of superfluid vortex bundles

TL;DR

This paper demonstrates that superfluid vortex bundles are structurally stable and can reconnect while preserving their identity, with Kelvin waves generated during reconnection, shedding light on superfluid turbulence dynamics.

Contribution

It introduces a combined approach using the vortex filament model and Gross Pitaevskii equation to study vortex bundle reconnections in superfluid helium II, highlighting their robustness and dynamics.

Findings

Vortex bundles in helium II are structurally robust.

Reconnection maintains vortex bundle identity.

Kelvin waves of large amplitude are generated during reconnection.

Abstract

Using the vortex filament model and the Gross Pitaevskii nonlinear Schroedinger equation, we show that bundles of quantised vortex lines in helium II are structurally robust and can reconnect with each other maintaining their identity. We discuss vortex stretching in superfluid turbulence and show that, during the bundle reconnection process, Kelvin waves of large amplitude are generated, in agreement with the finding that helicity is produced by nearly singular vortex interactions in classical Euler flows.