Strong field gravitational lensing in stringy black hole
Strong field gravitational lensing in stringy black hole
复制标题
弦状黑洞中的强场引力透镜
DOI：
10.1007/s10509-015-2350-3
复制
发表时间：
2015
影响因子：
1.9
通讯作者：
Duan Peng-Fei
中科院分区：
文献类型：
--
作者：
Geng Jin-Ling;Zhang Yu;Li En-Kun;Duan Peng-Fei
本文采用强场极限方法研究了弦黑洞的强引力透镜效应。将银河系中心的超大质量天体建模为弦状黑洞，估计了强场极限系数和观测值的数值。此外，通过对观测值的测量，可以得到强场极限系数，以重建弦黑洞中强场引力透镜的偏转角的完全膨胀。将我们的结果与史瓦西黑洞的结果进行比较，很容易发现在参数α的影响下，弦黑洞的所有值都偏离史瓦西时空的值，这为我们区分弦黑洞和史瓦西黑洞提供了另一种方法。在我们的模型中，随着参数α的增大，角度位置θ∞增大，相对量级减小。
In this paper, we studied the strong gravitational lensing due to the stringy black hole using the strong field limit approach. Modeling the supermassive object at the galactic center as stringy black hole, the numerical values of the strong field limit coefficients and the observables were estimated. Moreover, by measuring the observables, one can get the strong field limit coefficients to reconstruct the full expansion of the deflection angle for the strong field gravitational lensing in stringy black hole. Comparing our results with that of Schwarzschild black hole, it is easy to find that all the values in stringy black hole diverge from those of Schwarzschild spacetime under the influence of the parameterα, which gives us an alternative way to distinguish the stringy black hole from the Schwarzschild black hole. In our model, with the parameterαincreasing, the angular positionθ∞increases and the relative magnitudesdecreases.