Hyperon bulk viscosity in the presence of antikaon condensate

Abstract

We investigate the hyperon bulk viscosity due to the non-leptonic process $n+p\rightleftharpoons p+\Lambda$ in $K^{-}$ condensed matter and its effect on the r-mode instability in neutron stars. We find that the hyperon bulk viscosity coefficient in the presence of antikaon condensate is suppressed compared with the case without the condensate. The suppressed hyperon bulk viscosity in the superconducting phase is still an efficient mechanism to damp the r-mode instability in neutron stars.

AASTeX; 21 pages including 5 figures; change in the title and replaced by the revised version

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• Massive $\Delta$-resonance admixed hypernuclear stars with anti-kaon condensations
• Nuclear symmetry energy and the r-mode instability of neutron stars
• Leptonic contribution to the bulk viscosity of nuclear matter
• Hyperon bulk viscosity in strong magnetic fields
• Magnetic field generated by r-modes in accreting quark stars
• Bulk viscosity and r-modes of neutron stars
• Shear viscosity in antikaon condensed matter