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Superfluid hyperon bulk viscosity and the r-mode instability of rotating neutron stars

Superfluid hyperon bulk viscosity and the r-mode instability of rotating neutron stars
Superfluid hyperon bulk viscosity and the r-mode instability of rotating neutron stars
In order to establish whether the unstable r modes in a rotating neutron star provide a detectable source of gravitational waves, we need to understand the details of the many dissipative processes that tend to counteract the instability. It has been established that the bulk viscosity due to exotic particles, like hyperons, may be particularly important in this respect. However, the effects of hyperon superfluidity have so far not been fully accounted for. While the associated suppression of the reaction rates that give rise to the bulk viscosity has been estimated, superfluid aspects of the fluid dynamics have not been considered. In this paper we determine the r-mode instability window for a neutron star with a ?? hyperon core, using the appropriate multifluid formalism including, for the first time, the effect of the ‘superfluid’ bulk viscosity coefficients. We demonstrate that, even though the extra terms may increase the bulk viscosity damping somewhat, their presence does not affect the qualitative features of the r-mode instability window.

dense matter, gravitational waves, stars, neutron, oscillations
0035-8711
1897-1915
Haskell, B.
a3c09067-6932-45cc-902d-3b7117ec848d
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Haskell, B.
a3c09067-6932-45cc-902d-3b7117ec848d
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304

Haskell, B. and Andersson, N. (2010) Superfluid hyperon bulk viscosity and the r-mode instability of rotating neutron stars. Monthly Notices of the Royal Astronomical Society, 408 (3), 1897-1915. (doi:10.1111/j.1365-2966.2010.17255.x).

Record type: Article

Abstract

In order to establish whether the unstable r modes in a rotating neutron star provide a detectable source of gravitational waves, we need to understand the details of the many dissipative processes that tend to counteract the instability. It has been established that the bulk viscosity due to exotic particles, like hyperons, may be particularly important in this respect. However, the effects of hyperon superfluidity have so far not been fully accounted for. While the associated suppression of the reaction rates that give rise to the bulk viscosity has been estimated, superfluid aspects of the fluid dynamics have not been considered. In this paper we determine the r-mode instability window for a neutron star with a ?? hyperon core, using the appropriate multifluid formalism including, for the first time, the effect of the ‘superfluid’ bulk viscosity coefficients. We demonstrate that, even though the extra terms may increase the bulk viscosity damping somewhat, their presence does not affect the qualitative features of the r-mode instability window.

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More information

Published date: November 2010
Keywords: dense matter, gravitational waves, stars, neutron, oscillations

Identifiers

Local EPrints ID: 181235
URI: http://eprints.soton.ac.uk/id/eprint/181235
ISSN: 0035-8711
PURE UUID: 4c1cd742-2bf6-4256-b58c-6950781f01c8
ORCID for N. Andersson: ORCID iD orcid.org/0000-0001-8550-3843

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Date deposited: 13 Apr 2011 13:50
Last modified: 09 Jan 2022 02:57

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Contributors

Author: B. Haskell
Author: N. Andersson ORCID iD

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