论文标题
在四维高斯黑洞中带有球形积聚的阴影和光子球
Shadows and photon spheres with spherical accretions in the four-dimensional Gauss-Bonnet black hole
论文作者
论文摘要
我们研究了具有静态和插入球形积聚的四维高斯黑洞的阴影和光子球。我们表明，在这两种情况下，阴影和光子球总是存在。阴影和光子球的半径独立于固定高斯骨网常数的积聚曲线，这意味着阴影是时空几何形状的签名，在这种情况下，阴影几乎不受积聚的影响。由于具有多普勒效应，因此发现插入积聚的阴影比静态增生的阴影更暗。我们还研究了高斯 - 骨网常数对阴影和光子球的效果，并发现高斯 - 骨网常数越大，阴影和光子球的半径越小。特别是，观察到的特定强度随着高斯 - 骨网常数的增加而增加。
We investigate the shadows and photon spheres of the four-dimensional Gauss-Bonnet black hole with the static and infalling spherical accretions. We show that for both cases, the shadow and photon sphere are always present. The radii of the shadow and photon sphere are independent of the profiles of accretion for a fixed Gauss-Bonnet constant, implying that the shadow is a signature of the spacetime geometry and it is hardly influenced by accretion in this case. Because of the Doppler effect, the shadow of the infalling accretion is found to be darker than that of the static one. We also investigate the effect of the Gauss-Bonnet constant on the shadow and photon sphere, and find that the larger the Gauss-Bonnet constant is, the smaller the radii of the shadow and photon sphere will be. In particular, the observed specific intensity increases with the increasing of the Gauss-Bonnet constant.
