Open AccessBulk viscosity of mixed nucleon–hyperon–quark matter in neutron stars
Author(s) -
Pan NaNa,
Zheng XiaoPing,
Li JiaRong
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10759.x
Subject(s) - physics , hyperon , neutron star , volume viscosity , baryon , particle physics , stars , quark , nuclear physics , nucleon , strange matter , viscosity , astrophysics , thermodynamics
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 +Γ Λ + 2Γ Σ −. 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.