Vortex splitting in subcritical nonlinear Schrödinger equations

Natalia G. Berloff

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10 Citations (Scopus)

Abstract

Vortices and axisymmetric vortex rings are considered in the framework of the subcritical nonlinear Schrödinger equations. The higher order nonlinearity present in such systems models many-body interactions in superfluid systems and allows one to study the effects of negative pressure on vortex dynamics. We find the critical pressure for which the straight-line vortex becomes unstable to radial expansion of the core. The energy of the straight-line vortices and energy, impulse and velocity of vortex rings are calculated. The effect of a varying pressure on the vortex core is studied. It is shown that under the action of the periodically varying pressure field a vortex ring may split into many vortex rings and the conditions for which this happens are elucidated. These processes are also relevant to experiments in Bose-Einstein condensates where the strength and the sign of two-body interactions can be changed via Feshbach resonance.

Original languageEnglish
Article number051403
JournalFluid Dynamics Research
Volume41
Issue number5
DOIs
Publication statusPublished - 2009
Externally publishedYes

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