Abstract
Tangles of a quantized vortex line of initial density and a variable amplitude of fluctuations of flow velocity at the largest length scale are generated in superfluid at , and their free decay is measured. If is small, the excess random component of the vortex line length first decays as until it becomes comparable with the structured component responsible for the classical velocity field, and the decay changes to . The latter regime always ultimately prevails, provided the classical description of holds. A quantitative model of coexisting cascades of quantum and classical energies describes all regimes of the decay.
- Received 20 November 2016
DOI:https://doi.org/10.1103/PhysRevLett.118.134501
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