Kurkela Aleksi, Zhu Yan
Physics Department, Theory Unit, CERN, CH-1211 Genève 23, Switzerland.
Faculty of Science and Technology, University of Stavanger, 4036 Stavanger, Norway.
Phys Rev Lett. 2015 Oct 30;115(18):182301. doi: 10.1103/PhysRevLett.115.182301. Epub 2015 Oct 27.
We numerically solve the (2+1)-dimensional effective kinetic theory of weak coupling QCD under longitudinal expansion, relevant for early stages of heavy-ion collisions. We find agreement with viscous hydrodynamics and classical Yang-Mills simulations in the regimes where they are applicable. By choosing initial conditions that are motivated by a color-glass-condensate framework, we find that for Q_{s}=2 GeV and α_{s}=0.3 the system is approximately described by viscous hydrodynamics well before τ≲1.0 fm/c.
我们对弱耦合量子色动力学在纵向膨胀下的（2 + 1）维有效动力学理论进行了数值求解，这与重离子碰撞的早期阶段相关。我们发现在粘性流体动力学和经典杨 - 米尔斯模拟适用的区域内，二者结果相符。通过选择由色玻璃凝聚框架激发的初始条件，我们发现对于(Q_{s}=2)吉电子伏特和(\alpha_{s}=0.3)，在(\tau \lesssim 1.0)飞米/ 厘秒之前，该系统就可以很好地用粘性流体动力学来近似描述。
