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arXiv 2005.05355gr-qcastro-ph.CO
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二次引力理论中慢旋转光源引起的光弯曲

Light bending by a slowly rotating source in quadratic theories of gravity

Luca Buoninfante, Breno L. Giacchini

摘要:

本文在二次引力理论的背景下研究了慢旋转光源引起的光弯曲,其中Einstein-Hilbert作用量被曲率张量中的二次项所扩展。偏转角的计算采用基于高斯-邦纳定理的方法,并在弱透镜的近似下工作;此外,我们假设源和观察者在无限远的距离。所提出的形式是非常一般的,适用于任何弱引力场和慢转动极限下的时空度规。给出了几种定域和非定域理论的偏转角的显式表达式,并讨论了一些唯象意义。

英文摘要:

In this paper we study the light bending caused by a slowly rotating source in the context of quadratic theories of gravity, in which the Einstein--Hilbert action is extended by additional terms quadratic in the curvature tensors. The deflection angle is computed employing the method based on the Gauss--Bonnet theorem and working in the approximation of a weak lens; also, we assume that the source and observer are at an infinite distance. The formalism presented is very general and applies to any spacetime metric in the limit of weak gravitational field and slow rotation. We find the explicit formula for the deflection angle for several local and nonlocal theories, and also discuss some phenomenological implications.

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