Bulk viscosity of strange matter and r-modes in neutron stars

We discuss bulk viscosity due to non-leptonic processes involving hyperons and Bose-Einstein condensate of negatively charged kaons in neutron stars. It is noted that the hyperon bulk viscosity coefficient is a few order of magnitude larger than that of the case with the condensate. Further it is found that the hyperon bulk viscosity is suppressed in a superconducting phase. The hyperon bulk viscosity efficiently damps the r-mode instability in neutron stars irrespective of whether a superconducting phase is present or not in neutron star interior.

Source: arXiv:0812.5021v1 - http://arxiv.org/abs/0812.5021v1 PDF: https://arxiv.org/pdf/0812.5021v1 Original Link: http://arxiv.org/abs/0812.5021v1