破碎彩色玻璃冷凝液的椭圆流动和剪切粘度
Elliptic Flow and Shear Viscosity of the Shattered Color Glass Condensate
摘要：
在这次演讲中，我们报告了我们的结果，关于在相对论重离子碰撞中产生的夸克胶子等离子体的椭圆流的计算，通过求解相对论玻尔兹曼方程的部分子分布函数在一个固定的剪切粘度熵密度比$η/s$调整模拟火球的膨胀。我们强调饱和度的作用，在初始胶子光谱建模的彩色玻璃凝聚体的粉碎，导致初始分布是不平衡的。我们发现，即使热化过程是相当快的$τ_{therm} \approx 0.8 \,\rm fm/c$，饱和降低了建立椭圆流的效率。并且压力各向同性甚至更快$τ_{isotr} \approx 0.3 \,\rm fm/c$。初始非平衡的影响表现为非中心碰撞，并可以修改估计的粘度方面的假设充分热化在$p_T$ -空间。
英文摘要：
In this talk, we report on our results about the computation of the elliptic flow of the quark-gluon-plasma produced in relativistic heavy ion collisions, simulating the expansion of the fireball by solving the relativistic Boltzmann equation for the parton distribution function tuned at a fixed shear viscosity to entropy density ratio $η/s$. We emphasize the role of saturation in the initial gluon spectrum modelling the shattering of the color glass condensate, causing the initial distribution to be out of equilibrium. We find that the saturation reduces the efficiency in building-up the elliptic flow, even if the thermalization process is quite fast $τ_{therm} \approx 0.8 \,\rm fm/c$. and the pressure isotropization even faster $τ_{isotr} \approx 0.3 \,\rm fm/c$. The impact of the initial non-equilibrium manifests for non-central collisions and can modify the estimate of the viscosity respect to the assumption of full thermalization in $p_T$-space.
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