论文标题
较暗，更亮的麸皮：在强耦合磁化等离子体中抑制和增强光子产生
Darker and brighter branes: Suppression and enhancement of photon production in a strongly coupled magnetized plasma
论文作者
论文摘要
我们通过强烈的外部磁场的强耦合等离子体扩展了对光子发射的全息分析。我们先前表明，在特定模型中，血浆产生的任何光子都必须处于其唯一的极化状态与反应平面平行。在本文中，我们考虑了一种放宽以前强加的约束的结构，从而允许平面或平面偏振的光子发射。这构成了我们以前的研究的完成，因为这两个极化状态的完全反应方程将涉及面内的方程式与我们之前探索的方程式相同。鉴于上述，有关计算的详细信息和一部分的详细信息以及我们此处介绍的发射光子差异率的数值结果与上一封信中省略的差异完全相对应。我们的主要结果之一是，通过引入强度为$ b _ {\ vartheta} $值的非变化磁场来增加光子的产生，在此上面，其效果被逆转，并且所述生产变得低于$ b = 0 $ case。特征强度$ b _ {\ vartheta} $取决于传播方向，并且随着光子动量与磁场对齐，趋于零。此外，我们还表明磁场具有增加椭圆流的值的作用，从而为在碰撞实验中测得的过量提供了可能的解释。全息模型是使用有效的五维作用来构建的，该动作除恒定磁场外还包括标量场。
We extend our holographic analysis of the emission of photons by a strongly coupled plasma subject to a very intense external magnetic field. We previously showed that in a particular model, any photon produced by the plasma had to be in its only polarization state parallel to the reaction plane. In this paper we consider a construction that relaxes a formerly imposed constraint, permitting the emission of photons with either out-plane or in-plane polarization. This constitutes a completion of our former study because the fully back-reacted equations decouple for these two polarization states in such a manner that those involving the in-plane are identical to the ones we explored previously. In view of the above, part of the details concerning the calculations and of the numerical results for the differential rate of emitted photons that we present here correspond exactly to those omitted in our preceding letter. One of our main results is that the production of photons is increased by the introduction of a non-vanishing magnetic field with an intensity up to a value $B_{\vartheta}$, above which the effect is reversed and said production becomes lower than the $B=0$ case. The characteristic intensity $B_{\vartheta}$ depends on the propagation direction and tends to zero as the photon momentum becomes aligned with the magnetic field. Additionally, we also show that the magnetic field has the effect of increasing the value of the elliptic flow, providing a possible explanation for the excess measured in collision experiments. The holographic model is constructed using an effective five-dimensional action that includes a scalar field in addition to the constant magnetic field.
