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Effect of hyperon-hyperon interaction on bulk viscosity and r-mode instability in neutron stars

Debarati Chatterjee·Debades Bandyopadhyay
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Abstract

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.

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Debarati Chatterjee, Debades Bandyopadhyay. 2006-06-12. Effect of hyperon-hyperon interaction on bulk viscosity and r-mode instability in neutron stars. https://doi.org/10.1103/physrevd.74.023003

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