强透镜与非最小耦合电磁场
Strong Lensing and Nonminimally Coupled Electromagnetism
摘要：
研究了引力与电磁场非最小耦合情形下史瓦西黑洞在大偏转角下的透镜效应。我们表明，光子遵循一个有效的几何形状，它显示了一个有效的光子球。对于源、透镜和观察者对准的情况，从而形成相对论性爱因斯坦环，计算了第一和第二环之间的角间距$δθ$与相关耦合参数的依赖关系。我们认为，这样的分离，这可能是测量的望远镜，将在不久的将来运作，可能会设置一个上限和下限的耦合参数。
英文摘要：
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.
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