Directed flow in relativistic resistive magneto-hydrodynamic expansion for symmetric and asymmetric collision systems
Directed flow in relativistic resistive magneto-hydrodynamic expansion for symmetric and asymmetric collision systems
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DOI：
10.1103/physrevc.107.014901
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发表时间：
2022-09
影响因子：
3.1
通讯作者：
K. Nakamura;T. Miyoshi;C. Nonaka;H. R. Takahashi
中科院分区：
文献类型：
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作者：
K. Nakamura;T. Miyoshi;C. Nonaka;H. R. Takahashi
基于相对论电阻磁流体力学框架，建立了高能重离子碰撞的动力学模型。使用我们新开发的（3+1）维相对论电阻磁流体动力学代码，我们研究磁流体动力学膨胀在对称和非对称碰撞系统作为第一个应用到高能重离子碰撞。作为电磁场的一个现实的初始条件，我们考虑了具有沿束轴方向运动的点带电粒子源项的麦克斯韦方程组的解，其中包括介质的有限常数电导率。我们计算了RHIC能区对称和非对称碰撞中的定向流。我们发现有限电导率对非对称碰撞系统中的定向流有显著的影响。我们证实，一定量的能量转移耗散与欧姆导电发生在非对称碰撞系统中，因为由两个不同的碰撞核产生的电场的不对称性。由于这种能量传递使介质的压力梯度变平，定向流的增长减少。
We construct a dynamical model for high-energy heavy-ion collision based on the relativistic resistive magneto-hydrodynamic framework. Using our newly developed (3+1)-dimensional relativistic resistive magneto-hydrodynamics code, we investigate magneto-hydrodynamic expansion in symmetric and asymmetric collision systems as a first application to high-energy heavy-ion collisions. As a realistic initial condition for electromagnetic fields, we consider the solutions of the Maxwell equations with the source term of point charged particles moving in the direction of the beam axis, including finite constant electrical conductivity of the medium. We evaluate the directed flow in the symmetric and asymmetric collisions at RHIC energy. We find a significant effect of finite electrical conductivity on the directed flow in the asymmetric collision system. We confirm that a certain amount of energy transfer by dissipation associated with Ohmic conduction occurs in the asymmetric collision system because of asymmetry of the electric field produced by two different colliding nuclei. Because this energy transfer makes the pressure gradient of the medium flatter, the growth of directed flow decreases.