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ID: 2768.0, MPI für Gravitationsphysik / Astrophysical Relativity
Effect of hyperon bulk viscosity on neutron-star r-modes
Authors:Lindblom, Lee; Owen, Benjamin J.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review D
Volume:65
Sequence Number of Article:063006
Review Status:not specified
Audience:Not Specified
Abstract / Description:Neutron stars are expected to contain a significant number of hyperons in addition to protons and neutrons in the highest density portions of their cores. Following the work of Jones, we calculate the coefficient of bulk viscosity due to nonleptonic weak interactions involving hyperons in neutron-star cores, including new relativistic and superfluid effects. We evaluate the influence of this new bulk viscosity on the gravitational radiation driven instability in the r-modes. We find that the instability is completely suppressed in stars with cores cooler than a few times 109 K, but that stars rotating more rapidly than 10?30% of maximum are unstable for temperatures around 1010 K. Since neutron-star cores are expected to cool to a few times 109 K within seconds (much shorter than the r-mode instability growth time) due to direct Urca processes, we conclude that the gravitational radiation instability will be suppressed in young neutron stars before it can significantly change the angular momentum of the star.
External Publication Status:published
Document Type:Article
Communicated by:Bernhard F. Schutz
Affiliations:MPI für Gravitationsphysik/Astrophysical Relativity
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