论文标题
强烈的镜头和非微小耦合电磁作和
Strong Lensing and Nonminimally Coupled Electromagnetism
论文作者
论文摘要
检查了由Schwarzschild黑洞引起的大挠度角度的镜头，以期在引力和电磁之间存在非微小耦合。我们表明光子遵循有效的几何形状，该几何形状显示有效的光子球。对于源，镜头和观察者对齐的情况，形成相对论的爱因斯坦环，在第一和第二环之间与相关耦合参数之间的角度分离$Δθ$的依赖性。我们认为，这种分离可以通过在不久的将来可以操作的望远镜来衡量的，可能会为耦合参数设定上限和下限。
The lensing at large deflection angles caused by a Schwarzschild black hole for the case of a nonminimal coupling between gravitation and electromagnetism is examined. We show that photons follow an effective geometry, which displays an effective photon sphere. For the case in which the source, lens and observer are aligned, so that relativistic Einstein rings are formed, the dependence of the angular separation $δθ$ between the first and second ring with the relevant coupling parameter is calculated. We argue that such a separation, which may be measured by telescopes that will be operative in the near future, may set an upper and a lower limit for the coupling parameter.
