论文标题
膨胀的夸克 - 杜伦等离子体中的电磁反应
Electromagnetic response in an expanding quark-gluon plasma
论文作者
论文摘要
常规欧姆定律的有效性是在重型离子碰撞中产生的迅速发展的夸克 - 格鲁隆等离子体的背景下进行了测试。在这里，我们使用动力学理论中的分析解决方案讨论电磁反应。如前所述，在不介入的血浆中打开电场后，时间相关电流由$ \ mathbf {j}（j}（t）=（1-e^{ - t/t/τ_0}）σ_{0} {0} \ mathbf {e} $ $τ_0$是$τ_0$ sestentim $τ_0$ sestentiment $τ_0是$τ_0n is $τ____________________电导率。这种不完整的电磁响应可降低夸克 - 胶原等离子体中磁通量捕获的效率，并可能阻止观察到手性磁效应。在这里，我们将研究扩展到快速扩展的血浆。我们发现，温度降低和运输松弛时间的增加对电磁反应有相反的影响。前者抑制了时间依赖的电导率，而后者则增强了电导率。
The validity of conventional Ohm's law is tested in the context of a rapidly evolving quark-gluon plasma produced in heavy-ion collisions. Here we discuss the electromagnetic response using an analytical solution in kinetic theory. As conjectured previously, after switching on an electric field in a nonexpanding plasma, the time-dependent current is given by $\mathbf{J}(t)=(1-e^{-t/τ_0}) σ_{0} \mathbf{E}$, where $τ_0$ is the transport relaxation time and $σ_{0}$ is the steady-state electrical conductivity. Such an incomplete electromagnetic response reduces the efficiency of the magnetic flux trapping in the quark-gluon plasma and may prevent the observation of the chiral magnetic effect. Here we extend the study to the case of a rapidly expanding plasma. We find that the decreasing temperature and the increasing transport relaxation time have opposite effects on the electromagnetic response. While the former suppresses the time-dependent conductivity, the latter enhances it.
