Journal article
Collective, glitch-like vortex motion in a neutron star with an annular pinning barrier
JR Lönnborn, A Melatos, B Haskell
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2019
Abstract
Neutron star glitches are commonly believed to occur, when angular momentum is transferred suddenly from the star's interior to the crust by the collective unpinning and repinning of large numbers of superfluid vortices. In general, the pinning potential associated with nuclei in the crustal lattice varies as a function of radius. We explore vortex dynamics under these conditions by solving the 3D Gross-Pitaevskii equation in a rotating, harmonic trap with an axisymmetric 'moat' of deeper pinning sites on an otherwise uniform, corotating pinning grid. The moat is designed to resemble crudely a radially dependent pinning profile in a neutron star crust, although the values of the pinning pote..
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Awarded by Australian Research Council
Funding Acknowledgements
We thank Dr Tapio Simula for authorizing the use of his GPE solver in this paper. The code operateswithin the real-space product, finite-element, discrete-variable spatial representation and employs an explicit, fourth-order, split-operator technique to propagate the solution in time. The research was supported by funding from the Australian Research Council's Discovery Program. BH acknowledges support from Polish National Science Centre (NCN) grant SONATA BIS 2015/18/E/ST9/00577.