arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.1091hep-phnucl-th
收藏

发散型2+1耗散流体力学在重离子碰撞中的应用

Divergence-type 2+1 dissipative hydrodynamics applied to heavy-ion collisions

J. Peralta-Ramos, E. Calzetta

摘要:

本文应用发散型理论(DTT)耗散流体力学方法研究了$\sqrt{s_{NN}}=$ 200 GeV Au+Au相对论重离子碰撞中火球的2+1时空演化. DTT是精确的流体动力学理论,不依赖于速度梯度展开,因此超越了二阶理论。我们数值求解Glauber初始条件的DTT的运动方程,并将结果与基于共形不变量(BRSS)和数据的二阶理论的结果进行比较。我们发现,在DTT中,带电强子最小偏置椭圆流在较低的$p_T$处达到最大值,并且DTT允许$η/s$的值略大于BRSS。我们的研究结果表明,粘性流体动力学形式主义之间的差异是一个重要的不确定性来源的精确提取$η/s$从实验。

英文摘要:

We apply divergence-type theory (DTT) dissipative hydrodynamics to study the 2+1 space-time evolution of the fireball created in Au+Au relativistic heavy-ion collisions at $\sqrt{s_{NN}}=$200 GeV. DTTs are exact hydrodynamic theories that do no rely on velocity gradient expansions and therefore go beyond second-order theories. We numerically solve the equations of motion of the DTT for Glauber initial conditions and compare the results with those of second-order theory based on conformal invariants (BRSS) and with data. We find that the charged-hadron minumum-bias elliptic flow reaches its maximum value at lower $p_T$ in the DTT, and that the DTT allows for a value of $η/s$ slightly larger than that of the BRSS. Our results show that the differences between viscous hydrodynamic formalisms are a significant source of uncertainty in the precise extraction of $η/s$ from experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑