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Abstract: A new mechanism of thermalization involving a direct energy cascade isobtained in the truncated Gross-Pitaevskii dynamics. A long transient withpartial thermalization at small-scales is observed before the system reachesequilibrium. Vortices are found to disappear as a prelude to finalthermalization. A bottleneck that produces spontaneous effectiveself-truncation and delays thermalization is characterized when largedispersive effects are present at the truncation wavenumber. Order of magnitudeestimates indicate that self-truncation takes place in turbulent Bose-Einsteincondensates. This effect should also be present in classical hydrodynamics andmodels of turbulence.



Author: Giorgio Krstulovic, Marc Brachet

Source: https://arxiv.org/







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