论文标题
Quark-Gluon等离子体的有效剪切和散装粘度：QCD与重型离子数据
Effective shear and bulk viscosities of the quark-gluon plasma: QCD versus heavy-ion data
论文作者
论文摘要
近年来，从重型离子数据的全球比较与流体动力学模拟的结果中，从全球比较重型离子数据中，从夸克 - 葡萄糖等离子体的熵比中提取依赖温度依赖的剪切（$η/s $）和散装（$ζ/s $）粘度的巨大努力。然而，可以说是粘度最敏感的探针的各向异性流，仅对{\ it有效的\/}粘度比熵比敏感，这是通过在温度上取得加权平均值而获得的，并概括了剪切和大块的贡献。 We estimate this effective viscosity using existing first-principles calculations, which give $0.17<(η/s)_{\rm eff}<0.21$, and $(ζ/s)_{\rm eff}<0.08$, implying that the damping of anisotropic flow at the LHC is mostly due to shear viscosity.从全球数据分析中提取的值与这些理论预测兼容。
In recent years, there has been a significant effort to extract the temperature-dependent shear ($η/s$) and bulk ($ζ/s$) viscosity over entropy ratios of the quark-gluon plasma from a global comparison of heavy-ion data with results of hydrodynamic simulations. However, anisotropic flow, which is arguably the most sensitive probe of viscosity, is only sensitive to an {\it effective\/} viscosity over entropy ratio, which is obtained by taking a weighted average over the temperature, and summing the contributions of shear and bulk. We estimate this effective viscosity using existing first-principles calculations, which give $0.17<(η/s)_{\rm eff}<0.21$, and $(ζ/s)_{\rm eff}<0.08$, implying that the damping of anisotropic flow at the LHC is mostly due to shear viscosity. The values extracted from global data analyses are compatible with these theory predictions.
