Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-24
Phys.Rev. D74 (2006) 023003
Astronomy and Astrophysics
Astrophysics
25 pages, 10 figures; two new figures added and results and discussion section revised; final version to appear in PRD
Scientific paper
10.1103/PhysRevD.74.023003
We investigate the effect of hyperon matter including hyperon-hyperon interaction on bulk viscosity. Equations of state are constructed within the framework of a relativistic field theoretical model where baryon-baryon interaction is mediated by the exchange of scalar and vector mesons. Hyperon-hyperon interaction is also taken into account by the exchange of two strange mesons. This interaction results in a smaller maximum mass neutron star compared with the case without the interaction. The coefficient of bulk viscosity due to the non-leptonic weak process is determined by these equations of state. The interacting hyperon matter reduces the bulk viscosity coefficient in a neutron star interior compared with the no interaction case. The r-mode instability is more effectively suppressed in hyperon-hyperon interaction case than that without the interaction.
Bandyopadhyay Debades
Chatterjee Debarati
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