Statistics – Computation
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l.113c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L113-L116.
Statistics
Computation
7
Computational Astrophysics, Flux Pinning, Neutron Stars, Random Processes, Stellar Interiors, Vortices, Angular Momentum, Impurities, Quantum Mechanics
Scientific paper
Pulsar glitches are commonly attributed to the transfer of angular momentum from the superfluid to the solid crust. The change in angular momentum of the neutron superfluid is determined by the motion of its vortex lines. In the star's inner crust, we assume vortices are pinned by density fluctuations of defects (vacancies in the nuclear lattice or impurities) and move by the process of vortex creep. The vortex line, subjected to a random potential, has many metastable states for which a barrier energy and a pinning force are estimated. Scaling properties of vortex creep including both quantum and classical unpinning processes are obtained, namely the vortex creep velocity and the crossover temperature.
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