A linear stability analysis of a superfluid vortex ring with toroidal normal-fluid flow concludes the ring is destabilized, but the approximate growth rate (Eq. 8) does not follow from the dispersion relation (Eq. 7).
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Instability of a Vortex Ring due to Toroidal Normal Fluid Flow in Superfluid 4He
A linear stability analysis of a superfluid vortex ring with toroidal normal-fluid flow concludes the ring is destabilized, but the approximate growth rate (Eq. 8) does not follow from the dispersion relation (Eq. 7).