论文标题
剪切传输远离均衡通过全息图
Shear transport far from equilibrium via holography
论文作者
论文摘要
在重型离子碰撞中，夸克 - 胶状等离子体的产生远非平衡。当前，通过量子染色体动力学（QCD）计算无法访问该制度。我们计算全息模型中远离平衡的剪切传输和熵，定义了剪切粘度与熵密度的时间相关比率，$η/s $。在大型强子对撞机的现实情况下，发现与其接近平衡值的大偏差最高为60％，即$ 1/4π$。我们预测$η/s $的远程平衡时间依赖性极大地影响了QCD血浆的演变，并影响了重离子碰撞数据中QCD特性从流量中提取的。
In heavy-ion collisions, the quark-gluon plasma is produced far from equilibrium. This regime is currently inaccessible by quantum chromodynamics (QCD) computations. We calculate shear transport and entropy far from equilibrium in a holographic model, defining a time-dependent ratio of shear viscosity to entropy density, $η/s$. Large deviations of up to 60% from its near-equilibrium value, $1/4π$, are found for realistic situations at the Large Hadron Collider. We predict the far-from-equilibrium time-dependence of $η/s$ to substantially affect the evolution of the QCD plasma and to impact the extraction of QCD properties from flow coefficients in heavy-ion collision data.
