Physics – Fluid Dynamics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..nef.b1006b&link_type=abstract
American Physical Society, New England Section Fall Meeting, in , abstract #B1.006
Physics
Fluid Dynamics
Scientific paper
Pulsars, which generally exhibit an increase in their period over time occasionally experience an increase in their period - followed by a slow increase back to the originally described increasing period. These sudden "glitches" appear to be independent of outside factors and are thus postulated to be due to the activity of the pulsar core -- more specifically, the superfluid neutron core. Several hypotheses exist of how the superfluid core triggers the glitches; the leading theory is that a peculiar aspect of superfluid dynamics -- the quantization of rotational velocities (so that curl velocity = 0) -- causes the increase in rotation. Superfluid vortices interact with the crust of the pulsar, and become "pinned" to the crystal lattice structure, allowing the core to rotate with the outer layers, despite the "friction free" motion of the core. When the vortices become unpinned -- possibly by tunnelling effects (called vortex creep) -- allowing the outer core to rotate independently of the core, causing the glitch.
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