论文标题
来自晶格的纯胶合QCD的粘度
Viscosity of pure-glue QCD from the lattice
论文作者
论文摘要
我们计算SU中的剪切粘度和散装粘度（3）晶格上的尺度理论，价格为$ 1.5 \，T_C $。粘度是通过重建的光谱函数从重构的光谱函数中提取的，我们从欧几里得时代的依赖性依赖性依赖性的依赖性依赖性。我们通过应用梯度流和阻塞方法获得了相关器前所未有的精度。将相关器推送到连续体，然后将其流动为零。为了提取粘性，我们将理论上启发的模型拟合到晶格数据，并使用Backus Gilbert方法对拟合结果进行了检查。剪切和散装粘度的最终估计值为$η/s = 0.15-0.48 $和$ζ/s = 0.017-0.059 $。
We calculate shear viscosity and bulk viscosity in SU(3) gauge theory on the lattice at $1.5 \,T_c$. The viscosities are extracted via a Kubo formula from the reconstructed spectral function which we determine from the Euclidean-time dependence of the corresponding channel of the energy-momentum tensor correlators. We obtain unprecedented precision for the correlators by applying gradient flow and blocking methods. The correlators are extrapolated to the continuum and then to zero flow time. To extract the viscosities we fit theoretically inspired models to the lattice data and crosscheck the fit results using the Backus Gilbert method. The final estimates for shear and bulk viscosity are $η/s = 0.15-0.48$ and $ζ/s = 0.017-0.059$.
