论文标题
使用SGR A*阴影图像测试黑洞赤道反射对称性
Testing black hole equatorial reflection symmetry using Sgr A* shadow images
论文作者
论文摘要
最近发布的M87星系中超级黑洞和我们自己的星系的图像使探测黑洞的空位并测试一般相对性（GR）。违反黑洞空位的赤道反射对称性显然是GR以外的物理学的吸烟枪。在本文中，我们使用sgr a*黑洞图像的环大小上的边界对违反黑洞反射对称性的约束进行约束，这与$ \ sim10 \％$内的GR中预测的临界曲线半径是一致的。我们考虑了一个类似Kerr的指标，其中违反反射对称性是由单个参数参数化的，而无需更改黑洞的多物。由于与杀伤量相关的隐藏对称性存在，即使时空是反射不对称的，临界曲线始终是垂直对称的。我们发现，临界曲线的大小对违反反射对称性的数量敏感，并使用SGR A*图像将第一个约束放在模型的参数空间上。
The recently released images of the supermassive black holes in the M87 galaxy and the galaxy of our own make probing black hole spacetimes and testing general relativity (GR) possible. The violation of equatorial reflection symmetry of black hole spacetimes is clearly a smoking gun of physics beyond GR. In this paper, we place constraints on the violation of black hole reflection symmetry using the bounds on the ring size of the Sgr A* black hole images, which are consistent with the critical curve radius predicted in GR within $\sim10\%$. Adopting a theory-agnostic framework, we consider a Kerr-like metric in which the violation of reflection symmetry is parametrized by a single parameter, without altering the multipoles of the black hole. The critical curves are always vertically symmetric due to the existence of hidden symmetry associated with the Killing tensor, even though the spacetime is reflection asymmetric. We find that the size of critical curves is sensitive to the amount of reflection symmetry being violated, and place the first constraints on the parameter space of the model using the Sgr A* images.
