Ultra-quantum turbulence in a quenched homogeneous Bose gas

TL;DR

This study uses numerical simulations to analyze the decay and characteristics of turbulence in a quenched homogeneous Bose gas, revealing properties similar to ultra-quantum turbulence rather than classical turbulence.

Contribution

It provides the first detailed numerical analysis of turbulence in a Bose gas following a thermal quench, highlighting its unique ultra-quantum turbulence properties.

Findings

Lacks Kolmogorov scaling and coherent structures

Exhibits properties similar to ultra-quantum turbulence

Shows turbulence behavior akin to superfluid helium under certain conditions

Abstract

Using the classical field method, we study numerically the characteristics and decay of the turbulent tangle of superfluid vortices which is created in the evolution of a Bose gas from highly nonequilibrium initial conditions. By analysing the vortex line density, the energy spectrum and the velocity correlation function, we determine that the turbulence resulting from this effective thermal quench lacks the coherent structures and the Kolmogorov scaling; these properties are typical of both ordinary classical fluids and of superfluid helium when driven by grids or propellers. Instead, thermal quench turbulence has properties akin to a random flow, more similar to another turbulent regime called ultra-quantum turbulence which has been observed in superfluid helium.