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Researchers Find Sound Splits Kelvins, Boosting Their Numbers

Quantum ZeitgeistNovember 1, 20263 min read

Gross, Pitaevskii evolution typically predicts wider dispersal and reduced steepness in superfluid turbulence, but reversing the starting sound wave flips that expectation entirely. A π phase shift demonstrates dynamic appreciation of an unexpected conversion channel where one Kelvin wave splits into two via phonon emission. This reveals how seemingly disparate properties link to control vortex behaviour at low temperatures.

A vortex in superfluids sheds energy and redistributes momentum when a Kelvin wave, a ripple on a quantized vortex, decays into two smaller waves by emitting a phonon, effectively increasing the number of Kelvin waves while reducing overall energy. Rotational invariance links this process’s acoustic shear amplitude to the difference in energies between these parent and daughter waves; microscopic calculations confirm this relationship. Energy…

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