Photon spheres and spherical accretion image of a hairy black hole

Photon spheres and spherical accretion image of a hairy black hole
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毛状黑洞的光子球和球形吸积图像

DOI:
10.1103/physrevd.104.024003
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发表时间:
2021-04
期刊:
影响因子:
5
通讯作者:
Yang Haitang
Yang Haitang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gan Qingyu;Wang Peng;Wu Houwen;Yang Haitang

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在本文中,我们首先考虑一类带电的,球形的和渐近平坦的毛状黑洞在Einstein-Maxwell标量理论与非最小耦合的标量场和电磁场的零测地线。值得注意的是,我们发现,有两个不稳定的圆形轨道的光子在一定的参数制度,对应于两个不稳定的光子球的大小不同的事件视界外。为了说明光子球的光学外观,我们考虑一个简单的球形模型的光学薄吸积的毛黑洞,并获得吸积图像的一个遥远的观察者看到。在单光子球的情况下,只有一个明亮的环出现在图像中,并确定为黑洞阴影的边缘。而在双光子球的情况下,图像中可能有两个半径不同的同心亮环,较小的一个作为阴影的边界,其半径在临界电荷处变为零。
In this paper, we first consider null geodesics of a class of charged, spherical and asymptotically flat hairy black holes in an Einstein-Maxwell-scalar theory with a non-minimal coupling for the scalar and electromagnetic fields. Remarkably, we show that there are two unstable circular orbits for a photon in a certain parameter regime, corresponding to two unstable photon spheres of different sizes outside the event horizon. To illustrate the optical appearance of photon spheres, we then consider a simple spherical model of optically thin accretion on the hairy black hole, and obtain the accretion image seen by a distant observer. In the single photon sphere case, only one bright ring appears in the image, and is identified as the edge of the black hole shadow. Whereas in the case with two photon spheres, there can be two concentric bright rings of different radii in the image, and the smaller one serves as the boundary of the shadow, whose radius goes to zero at the critical charge.
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