The Dynamics of Vortex Pinning in the Neutron Star Crust

Details The Dynamics of Vortex Pinning in the Neutron Star Crust The Dynamics of Vortex Pinning in the Neutron Star Crust

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008esnm.conf..404l&link_type=abstract

EXOTIC STATES OF NUCLEAR MATTER. Proceedings of the International Symposium EXOCT07. Held 11-15 June 2007 in Catania University,

Physics

Neutron Stars, Pulsars, Dense Matter, Rotating Stars

Scientific paper

The energetically-preferred rotational state of the inner-crust superfluid (SF) involves pinning of the neutron vortices to the lattice through a vortex-nucleus interaction. The question of whether or not vortices actually reach this state is crucial toward understanding the rotational modes of a neutron star (NS). I describe the physics of relaxation of unpinned vortices to the pinned state and show that vortices can pin only if the differential velocity between the SF and the solid is very low, ≲ 10 cm s-1. I argue that the pinned state is possibly dynamically inaccessible in a typical NS. I conclude with discussion of the implications for understanding NS spin jumps and long-period precession (nutation).

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