Exotic bulk viscosity and its influence on neutron star r-modes |
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Authors: | Debarati Chatterjee Debades Bandyopadhyay |
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Institution: | (1) Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India |
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Abstract: | We investigate the effect of exotic matter in particular, hyperon matter on neutron star properties such as equation of state
(EoS), mass-radius relationship and bulk viscosity. Here we construct equations of state within the framework of a relativistic
field theoretical model. As hyperons are produced abundantly in dense matter, hyperon–hyperon interaction becomes important
and is included in this model. Hyperon–hyperon interaction gives rise to a softer EoS which results in a smaller maximum mass
neutron star compared with the case without the interaction. Next we compute the coefficient of bulk viscosity and the corresponding
damping time scale due to the non-leptonic weak process including Λ hyperons. Further, we investigate the role of the bulk
viscosity on gravitational radiation driven r-mode instability in a neutron star of given mass and temperature and find that
the instability is effectively suppressed.
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Keywords: | Neutron stars Dense matter r-mode oscillation |
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