2008/12/30 by Chatterjee, Debarati, Bandyopadhyay, Debades
#Astrophysics (astro-ph) #FOS: Physical sciences
paper · doi:10.48550/arxiv.0812.5021
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.