论文标题
动量依赖性流动波动是对初始几何学的流体动力响应
Momentum-dependent flow fluctuations as a hydrodynamic response to initial geometry
论文作者
论文摘要
我们提出了对各向异性流的主要成分分析（PCA）的重新定义，该分析使其更直接地与系统初始几何形状的波动联系起来。然后，使用最新的流体动力模拟，我们在流动波动与初始横向几何形状的累积扩展之间建立明确的联系。特别是，我们表明椭圆流的第二个主要成分是由高阶累积物产生的，因此探测了初始状态的较小长度尺度。有了这些信息，可以对重型离子碰撞的早期动力学的特性（包括小规模结构）以及夸克 - 格鲁隆等离子体的特性提出新的约束。
We propose a redefinition of the principal component analysis (PCA) of anisotropic flow that makes it more directly connected to fluctuations of the initial geometry of the system. Then, using state-of-the-art hydrodynamic simulations, we make an explicit connection between flow fluctuations and a cumulant expansion of the initial transverse geometry. In particular, we show that the second principal component of elliptic flow is generated by higher-order cumulants, and therefore probes smaller length scales of the initial state. With this information, it will be possible to put new constraints on properties of the early-time dynamics of a heavy-ion collision, including small-scale structure, as well as properties of the quark-gluon plasma.
