Superfluid hyperon bulk viscosity and the r-mode instability of rotating neutron stars
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)
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Description/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 Σ− 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.
| Item Type: | Article |
|---|---|
| ISSN: | 0035-8711 (print) 1365-8711 (electronic) |
| Uncontrolled Keywords: | dense matter, gravitational waves, stars, neutron, stars, oscillations |
| Subjects: | Q Science > QA Mathematics Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | University Structure - Pre August 2011 > School of Mathematics > Applied Mathematics |
| ePrint ID: | 181235 |
| URI: | http://eprints.soton.ac.uk/id/eprint/181235 |
| Deposited On: | 13 Apr 2011 14:50 |
| Last Modified: | 01 Jun 2011 11:27 |
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