用Boltzmann-麦克斯韦方程组研究重离子碰撞中与电荷有关的定向流
Charge-dependent directed flows in heavy-ion collisions by Boltzmann-Maxwell equations
摘要：
通过自洽求解耦合的Boltzmann-麦克斯韦方程组，计算了在$\sqrt{s_{NN}}=200$ GeV的Au+Au碰撞中π介子和质子的定向流$v_{1}$和电荷相关定向流$Δv_{1}$.数值结果表明，在正的中快度区，π介子和质子的$v_{1}$都是负的，并且具有相似的行为和大小。相反，我们在$Δv_{1}$中发现了π介子和质子的完全不同的行为。不同之处在于质子的$Δv_{1}$主要来自介质的压力梯度，而π介子的$Δv_{1}$主要来自电磁场。我们的结果表明，电场的作用将略微超过磁场的作用，并导致π介子的$Δv_{1}$的小的负斜率
英文摘要：
We have calculated the directed flow $v_{1}$ and charge-dependent directed flow $Δv_{1}$ for pions and protons in Au+Au collisions at $\sqrt{s_{NN}}=200$GeV by solving the coupled Boltzmann-Maxwell equations self-consistently. Our numerical results show that $v_{1}$ for pions and protons are all negative in the positive mid rapidity region and have similar behavior and magnitude. In contrast we find a quite different behavior in $Δv_{1}$ for pions and protons. The difference lies in that $Δv_{1}$ for protons mainly comes from pressure gradients of the medium, while the dominant contribution to $Δv_{1}$ for pions is from electromagnetic fields. Our results indicate that the effect of the electric field will slightly exceed that of the magnetic and lead to a small negative slope of $Δv_{1}$ for pions
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。
