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

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

2008-12-30

arxiv.org/abs/0812.5021v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figues; to be published in the proceedings of the 10th International Symposium on Nuclei in the Cosmos, 27 July - 1

Scientific paper

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.

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