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arXiv 1804.00643gr-qchep-th
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利用高斯-邦纳定理研究旋转规则黑洞对光的偏转

Deflection of light by rotating regular black holes using the Gauss-Bonnet theorem

Kimet Jusufi, Ali Övgün, Joel Saavedra, P. A. González, Yerko Vásquez

摘要:

在本文中,我们研究了旋转的规则黑洞几何中的弱引力透镜,如Ayon-Beato-García(ABG),Barnut和Hayward黑洞。利用高斯-邦纳定理(GBT)计算了光的偏转角,并证明了光的偏转角可以看作是一种局部拓扑效应,其中偏转角可以通过考虑光线外的一个域应用于黑洞的光学几何来计算.然后,我们也证明了这些黑洞的偏转角通过测地线形式来验证我们的结果,并探讨与克尔解决方案的差异。这些黑洞除了总质量和旋转参数外,还有不同的参数,如电荷、磁荷和偏差参数。值得注意的是,我们发现光的偏转具有来自这些参数的校正项,这些校正项推广了克尔偏转角。

英文摘要:

In this paper, we study the weak gravitational lensing in the spacetime of rotating regular black hole geometries such as Ayon-Beato-García (ABG), Bardeen, and Hayward black holes. We calculate the deflection angle of light using the Gauss-Bonnet theorem (GBT) and show that the deflection of light can be viewed as a partially topological effect in which the deflection angle can be calculated by considering a domain outside of the light ray applied to the black hole optical geometries. Then, we demonstrate also the deflection angle via the geodesics formalism for these black holes to verify our results and explore the differences with the Kerr solution. These black holes have in addition to the total mass and rotation parameter, different parameters as electric charge, magnetic charge, and deviation parameter. Newsworthy, we find that the deflection of light has correction terms coming from these parameters which generalizes the Kerr deflection angle.

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