Bulk viscosity of Mixed nucleon-hyperon-quark Matter in Neutron stars

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 ${\Gamma }_n=K_s{\Gamma }_s+{\Gamma }_{\Lambda }+2{\Gamma }_{{\Sigma }^{-}}$. The conversion rate, $K_s$ in our scenario is a complicated function of baryon number density. We also consider 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 .

This paper contains 17 pages,8 figures and 1 table and is accepted by Monthly Notices of the Royal Astronomical Society

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Cited by in corpus (9)

• Bulk viscosity of superfluid hyperon stars
• Bulk viscosity in kaon condensed matter
• Hyperon bulk viscosity in the presence of antikaon condensate
• Hyperon bulk viscosity in strong magnetic fields
• Radiative viscosity of neutron stars
• Phase transitions and latent heat in magnetized matter
• Thermal Evolution of Strange Stars
• Signal of quark deconfinement in thermal evolution neutron stars with deconfinement heating
• Cooling of Hybrid Stars with Spin Down Compression