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Alfven's Theorem and a Neutron Star Core
Hannes Alfven (1943) wrote: “In view of the infinite conductivity,
every motion(perpendicular to the field) of the liquid in relation to the lines of force is forbidden because it would give infinite eddy currents. Thus the matter of the liquid is fastened to the lines of force, constituting a series of strings.” In other words, the field lines move as though they are frozen into the plasma. In the superfluid, superconducting core of a neutron star this would seem to lead to a contradiction. The superfluid is rotating as an array of quantum vortices. It is believed that the core is a Type II superconductor and so is permeated by a large number of tiny quantum flux tubes. These flux tubes are believed to be pinned to the crust and cannot pass through the core of a vortex, so I don’t understand how they can be rotating with the vortices. What have I missed? |
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