论文标题
相对论电阻式磁动力扩张的高能重型离子碰撞中电荷依赖性各向异性流动
Charge-dependent anisotropic flow in high-energy heavy-ion collisions from relativistic resistive magneto-hydrodynamic expansion
论文作者
论文摘要
我们使用相对论的电阻式磁力流动力学（RRMHD）研究了高能重型离子碰撞中电荷依赖性各向异性流动。我们将光学GLAUBER模型视为夸克 - 杜伦等离子体（QGP）的初始模型，以及在两个碰撞核中带有带电粒子的源项作为初始电磁场的麦克斯韦方程的解。在$ \ sqrt {s _ {\ mathrm {nn}}} = 200 $ gev中，在Au-au和Cu-au碰撞中使用这些初始条件进行了RRMHD仿真。我们已经根据RRMHD根据电荷分布计算了两个碰撞中的有向流量$ΔV_1$和椭圆流$ΔV_2$的电荷贡献。我们的结果表明，$ΔV_1$和$ΔV_2$与介质的电导率（$σ$）大致成正比。在$σ= 0.023〜 \ mathrm {fm}^{ - 1} $ case中，我们的$ΔV_1$的结果与Au-Au碰撞中的Star数据一致。此外，在Cu-Au碰撞中，$ΔV_1$在$η= 0 $时具有非零值。我们得出的结论是，电荷依赖性各向异性流是在高能重型离子实验中提取QGP培养基的电导率的良好探针。
We have investigated the charge-dependent anisotropic flow in high-energy heavy-ion collisions, using relativistic resistive magneto-hydrodynamics (RRMHD). We consider the optical Glauber model as an initial model of the quark-gluon plasma (QGP) and the solution of the Maxwell equations with source term of the charged particles in two colliding nuclei as initial electromagnetic fields. The RRMHD simulation is performed with these initial conditions in Au-Au and Cu-Au collisions at $\sqrt{s_{\mathrm{NN}}} = 200$ GeV. We have calculated the charge-odd contribution to the directed flow $Δv_1$ and elliptic flow $Δv_2$ in both collisions based on electric charge distributions as a consequence of RRMHD. Our results show that the $Δv_1$ and $Δv_2$ are approximately proportional to the electrical conductivity ($σ$) of the medium. In the $σ=0.023~\mathrm{fm}^{-1}$ case, our result of $Δv_1$ is consistent with STAR data in Au-Au collisions. Furthermore, in Cu-Au collisions, $Δv_1$ has a non-zero value at $η= 0$. We conclude that the charge-dependent anisotropic flow is a good probe to extract the electrical conductivity of the QGP medium in high-energy heavy-ion experiments.
