A superfluid perspective on neutron star dynamics
A superfluid perspective on neutron star dynamics
As mature neutron stars are cold (on the relevant temperature scale), one has to carefully consider the state of matter in their interior. The outer kilometre or so is expected to freeze to form an elastic crust of increasingly neutron-rich nuclei, coexisting with a superfluid neutron component, while the star’s fluid core contains a mixed superfluid/superconductor. The dynamics of the star depend heavily on the parameters associated with the different phases. The presence of superfluidity brings new degrees of freedom—in essence we are dealing with a complex multi-fluid system—and additional features: bulk rotation is supported by a dense array of quantised vortices, which introduce dissipation via mutual friction, and the motion of the superfluid is affected by the so-called entrainment effect. This brief survey provides an introduction to—along with a commentary on our current understanding of—these dynamical aspects, paying particular attention to the role of entrainment, and outlines the impact of superfluidity on neutron-star seismology
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Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
15 January 2021
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Abstract
As mature neutron stars are cold (on the relevant temperature scale), one has to carefully consider the state of matter in their interior. The outer kilometre or so is expected to freeze to form an elastic crust of increasingly neutron-rich nuclei, coexisting with a superfluid neutron component, while the star’s fluid core contains a mixed superfluid/superconductor. The dynamics of the star depend heavily on the parameters associated with the different phases. The presence of superfluidity brings new degrees of freedom—in essence we are dealing with a complex multi-fluid system—and additional features: bulk rotation is supported by a dense array of quantised vortices, which introduce dissipation via mutual friction, and the motion of the superfluid is affected by the so-called entrainment effect. This brief survey provides an introduction to—along with a commentary on our current understanding of—these dynamical aspects, paying particular attention to the role of entrainment, and outlines the impact of superfluidity on neutron-star seismology
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2103.10218
- Accepted Manuscript
Text
A_Superfluid_Perspective_on_Neutron_Star_Dynamics
- Version of Record
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Accepted/In Press date: 12 January 2021
Published date: 15 January 2021
Identifiers
Local EPrints ID: 456546
URI: http://eprints.soton.ac.uk/id/eprint/456546
ISSN: 2218-1997
PURE UUID: 63f1ce1b-d800-4329-9096-057fa5c54616
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Date deposited: 04 May 2022 17:25
Last modified: 17 Mar 2024 02:47
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