论文标题
Quark-Gluon等离子体的电导率：晶格QCD的视角
Electrical conductivity of the quark-gluon plasma: perspective from lattice QCD
论文作者
论文摘要
对晶格QCD确定的夸克 - 胶质等离子体的电导率的讨论。在提醒基本的定义和期望之后，回顾了各种光谱重建方法，包括使用Ansätze和Sum规则，最大熵和Backus-Gilbert方法以及Tikhonov正则化。到目前为止，给出了对晶格QCD结果的全面概述，包括比较不同晶格配方的。尽管晶格设置和光谱重建方法存在差异，但仍发现了获得的电导率的明显一致性。发现在调查的温度范围内，观察到QCD的温度依赖性很小，而对于动态夸克的QCD，在热交叉的附近降低了$σ/t $，与其在QGP中的值相比，观察到热交叉的$σ/T $。最后提出了几个公开问题。
A discussion on the electrical conductivity of the quark-gluon plasma as determined by lattice QCD is given. After a reminder of basic definitions and expectations, various methods for spectral reconstruction are reviewed, including the use of Ansätze and sum rules, the Maximum Entropy and Backus-Gilbert methods, and Tikhonov regularisation. A comprehensive overview of lattice QCD results obtained so far is given, including a comparison of the different lattice formulations. A noticeable consistency for the conductivities obtained is seen, in spite of the differences in the lattice setups and spectral reconstruction methods. It is found that in the case of quenched QCD little temperature dependence of $σ/T$ is seen in the temperature range investigated, while for QCD with dynamical quarks a reduction of $σ/T$ in the vicinity of the thermal crossover is observed, compared to its value in the QGP. Several open questions are posed at the end.
