We examine the temperature dependence of the shear viscosity η to electrical conductivity σ ratio, as well as the specific shear viscosity and the scaled electrical conductivity in QCD with light and strange quarks. Our calculations are performed in kinetic theory under the relaxation time approximation combined with the quasiparticle model. We compute all transport parameters using the isotropic and transport cross sections and compare our results to a class of quasiparticle models for the QGP with N_f = 2 + 1. The results depending on different schemes are examined. The ratio (η∕s)∕(σ∕T) quantifies the relation between the relaxation times of gluons and quarks and specifies their comparative role in the evolution of the QGP. We find an excellent agreement with the (η∕s)∕(σ∕T) ratio deduced from the dynamical quasiparticle model in which the quasiparticles are characterized not only by their effective masses but also by finite widths.

我们研究了轻度和奇异夸克在QCD中剪切粘度η与电导率σ比的温度依赖性，以及比剪切粘度和标度电导率。我们的计算是根据动力学理论在松弛时间近似下结合准粒子模型进行的。我们计算使用各向同性和运输横截面的所有传输参数和我们的比较结果一类准粒子模型，用于与QGP ñ _˚F = 2个+ 1，这取决于不同的方案，结果被检查。比值（η ∕ s）∕（σ ∕ T）量化胶子和夸克弛豫时间之间的关系，并指定它们在QGP演化中的比较作用。我们发现与（η ∕ s）∕（σ ∕ T）之比非常吻合，该比是从动态准粒子模型推导的，其中准粒子不仅以有效质量为特征，还以有限宽度为特征。