Electromagnetic Response in an Expanding Quark–Gluon Plasma
Electromagnetic Response in an Expanding Quark–Gluon Plasma
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DOI：
10.3390/particles5040034
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发表时间：
2022-10
期刊：
影响因子：
1.4
通讯作者：
I. Shovkovy
中科院分区：
文献类型：
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作者：
I. Shovkovy
传统的欧姆定律的有效性进行了测试的背景下，快速发展的夸克胶子等离子体中产生的重离子碰撞。在这里，我们讨论的电磁响应，使用动力学理论中的解析解。如前所述，在非膨胀等离子体中打开电场后，随时间变化的电流由J（t）=（1−e−t/τ0）σ 0 E给出，其中τ0是输运弛豫时间，σ0是稳态电导率。这种不完全的电磁响应降低了夸克-胶子等离子体中磁通捕获的效率，并且可能阻止手征磁效应的观察。在这里，我们将研究扩展到快速膨胀等离子体的情况。我们发现，降低温度和增加输运弛豫时间对电磁响应有相反的影响。而前者抑制的时间依赖性电导率，后者增强它。
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 J(t)=(1−e−t/τ0)σ0E, where τ0 is the transport relaxation time and σ0 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.