论文标题
DHOST黑洞的强烈镜头
Strong lensing by DHOST black holes
论文作者
论文摘要
强场极限中光的偏转是对重力理论的重要测试。但是，允许进行分析计算的度量的解决方案并不总是可用。我们实施了混合分析数字近似，以确定静态，球面对称性的挠曲中的偏转角。我们将其应用于称为退化高阶标量理论的理论类别中的一组数值黑洞解决方案。将我们的结果与更耗时的完整数值整合进行比较，我们发现我们可以准确地描述在距光子球体任意距离传递的光线的偏转角，并结合两个分析 - 划分近似值。此外，我们发现了一系列参数，其中DHOST黑洞预测了强大的镜头效应，其大小与事件范围望远镜报道的M87中超质量黑洞的不确定性相当，这表明强透镜是在这些模型上放置约束的可行替代方案。
The deflection of light in the strong field limit is an important test for alternative theories of gravity. However, solutions for the metric that allow for analytic computations are not always available. We implement a hybrid analytic-numerical approximation to determine the deflection angle in static, spherically symmetrics pacetimes. We apply this to a set of numerical black hole solutions within the class of theories known as Degenerate Higher Order Scalar-tensor Theories. Comparing our results to a more time consuming full numerical integration, we find that we can accurately describe the deflection angle for light rays passing at arbitrary distances from the photon sphere with a combination of two analytic-numerical approximations. Furthermore, we find a range of parameters where our DHOST black holes predict strong lensing effects whose size is comparable with the uncertainty in the properties of the supermassive black hole in M87 reported by the Event Horizon Telescope, showing that strong lensing is a viable alternative to put constraints on these models.
