Subleading harmonic flows in hydrodynamic simulations of heavy ion collisions
Subleading harmonic flows in hydrodynamic simulations of heavy ion collisions
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DOI：
10.1103/physrevc.91.044902
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发表时间：
2015-01
影响因子：
3.1
通讯作者：
A. Mazeliauskas;D. Teaney
中科院分区：
文献类型：
--
作者：
A. Mazeliauskas;D. Teaney
本文对大型强子对撞机（LHC）中Pb+Pb碰撞的逐事件流体动力学模拟进行了主成分分析（PCA）。主成分分析程序确定了对两粒子相关函数的两个主要贡献，它们共同捕获了99.9%的方差平方。我们发现次超前流动（流体力学中流动分解破裂的最大来源）主要是对三阶偏心径向激励的响应。我们在2+1D粘性流体力学中系统地研究了这些径向激励下的流体动力学响应。最后，我们利用初始几何的两种傅里叶模式构建了一个很好的几何预测器来预测先导流和次先导流的取向角和大小。
We perform a principal component analysis (PCA) of $v_3(p_T)$ in event-by-event hydrodynamic simulations of Pb+Pb collisions at the Large Hadron Collider (LHC). The PCA procedure identifies two dominant contributions to the two-particle correlation function, which together capture 99.9\% of the squared variance. We find that the subleading flow (which is the largest source of flow factorization breaking in hydrodynamics) is predominantly a response to the radial excitations of a third-order eccentricity. We present a systematic study of the hydrodynamic response to these radial excitations in 2+1D viscous hydrodynamics. Finally, we construct a good geometrical predictor for the orientation angle and magnitude of the leading and subleading flows using two Fourier modes of the initial geometry.