Journal Article

Lagrangian perturbation theory for a superfluid immersed in an elastic neutron star crust

N. Andersson, B. Haskell and L. Samuelsson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 1, pages 118-132
Published in print September 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19015.x
Lagrangian perturbation theory for a superfluid immersed in an elastic neutron star crust

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The inner crust of mature neutron stars, where an elastic lattice of neutron-rich nuclei coexists with a neutron superfluid, impacts on a range of astrophysical phenomena. The presence of the superfluid is key to our understanding of pulsar glitches, and is expected to affect the thermal conductivity and hence the evolution of the surface temperature. The coupling between crust and superfluid must also be accounted for in studies of neutron star dynamics, discussions of global oscillations and associated instabilities. In this paper, we develop Lagrangian perturbation theory for this problem, paying attention to key issues like superfluid entrainment, potential vortex pinning, dissipative mutual friction and the star’s magnetic field. We also discuss the nature of the core–crust interface. The results provide a theoretical foundation for a range of interesting astrophysical applications.

Keywords: asteroseismology; dense matter; gravitational waves; hydrodynamics; stars: neutron

Journal Article.  8505 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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