Jeudi 28 Avril
Résumé :
A new mechanism of thermalization involving a direct energy cascade is obtained
in the truncated Gross-Pitaevskii dynamics. A long transient with
partial thermalization at small-scales is observed before the system reaches
equilibrium. Vortices are found to disappear as a prelude to final thermalization.
A bottleneck that produces spontaneous effective self-truncation and
delays thermalization is characterized when large dispersive effects are present
at the truncation wavenumber. Order of magnitude estimates indicate that
self-truncation takes place in turbulent Bose-Einstein condensates. This effect
should also be present in classical hydrodynamics and models of turbulence.
RECRUTEMENT ACCES DIRECT
Le département de physique
Fête de la Science 2018 