论文标题
带有多个光子球的黑洞的重力镜头
Gravitational Lensing by Black Holes with Multiple Photon Spheres
论文作者
论文摘要
我们研究了通过毛茸茸的黑洞对光的重力镜头，在某个参数方面，在事件范围之外可以拥有两个不同尺寸的光子球。特别是，我们专注于点状光源的高阶图像和由光子球附近的强力透镜产生的发光天体。两个光子球通常是点状光源的高阶图像的数量。当一个毛茸茸的黑洞被天体球照亮时，两个光子球会在黑洞图像中产生两个临界曲线，而较小的临界曲线与阴影边缘一致。除了阴影边缘外的天体球体的一组高阶图像外，分别在较大的临界曲线内部和外部观察到另外两组高阶图像。
We study gravitational lensing of light by hairy black holes, which, in a certain parameter regime, can possess two photon spheres of different size outside the event horizon. In particular, we focus on higher-order images of a point-like light source and a luminous celestial sphere produced by strong gravitational lensing near photon spheres. Two photon spheres usually triple the number of high-order images of a point-like light source. When a hairy black hole is illuminated by a celestial sphere, two photon spheres would give rise to two critical curves in the black hole image, and the smaller critical curve coincides with the shadow edge. In addition to a set of higher-order images of the celestial sphere outside the shadow edge, two more sets of higher-order images are observed inside and outside the larger critical curve, respectively.
