Bulk viscosity of strange quark matter at first-order perturbative QCD approximation

Taking the thermodynamics potential for cold dense QCD in perturbation theory to the first order in coupling constant account, we calculate the bulk viscosity of strange quark matter(SQM), and find that the result is approximately 10(2) times than that of the ideal quark gas. In comparison with quasi-particle description model, we have the same result in order of magnitude. It is useful to improve the theory prediction that to apply the result to the calculation of the rotation speed limit, which is favorable for the explanation of the observation.