Bulk viscosity of mixed nucleon–hyperon–quark matter in neutron stars |
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| Authors: | Na-Na Pan Xiao-Ping Zheng Jia-Rong Li |
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| Institution: | Institute of Astrophysics, Huazhong Normal University, Wuhan 430079, China;Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China |
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| Abstract: | We calculate the coefficient of bulk viscosity by considering the non-leptonic weak interactions in the cores of hybrid stars with both hyperons and quarks. We first determine the dependence of the production rate of neutrons on the reaction rate of quarks in the non-leptonic processes, that is, Γ n = K s Γ s +ΓΛ+ 2ΓΣ? . The conversion rate, K s , in our scenario is a complicated function of baryon number density. We also consider the medium effect of quark matter on bulk viscosity. Using these results, we estimate the limiting rotation of the hybrid stars, which may suppress the r-mode instability more effectively. Hybrid stars should be the candidates for the extremely rapid rotators. |
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| Keywords: | dense matter gravitation stars: neutron stars: oscillations stars: rotation |
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