标题： 屏蔽带电黑洞 显示英文标题

标题： Shielding a charged black hole

摘要： 我们描述了一种屏蔽机制，用于浸入涉及带电物质场背景中的带电黑洞，该机制仅来源于爱因斯坦-麦克斯韦场方程。 特别是，我们考虑了爱因斯坦团块的带电推广，即一个被有效流体模型包围的带电黑洞，该模型代表部分带电的尘埃云。 我们表明，由此产生的屏蔽机制是普遍的，并且在问题的不同参数化中也会出现。 在此过程中，我们提供了在无电荷的时空区域中的最一般电真空解，但在其他地方存在静态和球对称电荷分布的情况下。 同时，我们还引入了一个方便的参数化方法，在带电流体环境中的带电黑洞存在情况下，给出了爱因斯坦-麦克斯韦场方程的全局解。 我们还评论了爱因斯坦-麦克斯韦团块中的光子球、阴影半径和射线准正则模式的性质。 显示英文摘要

摘要： We describe a shielding mechanism for a charged black hole immersed in a background involving charged matter fields, solely arising from the Einstein-Maxwell field equations. In particular, we consider a charged generalization of the Einstein cluster, that is a charged black hole surrounded by an effective fluid model for a partially charged dust cloud. We show that the shielding mechanism, arising thereof, is generic and appears in a different parametrization of the problem as well. In this process, we provide the most general electrovacuum solution in a spacetime region devoid of charges, but in the presence of a static and spherically symmetric charge distribution elsewhere. Side by side, we also introduce a convenient parametrization, providing the global solution of the Einstein-Maxwell's field equations in the presence of a charged black hole within the environment of charged fluid. We also comment on the nature of the photon sphere, shadow radius and the eikonal quasi-normal modes in the Einstein-Maxwell cluster.