论文标题
EHT对一般相对性的强场状态的测试
EHT tests of the strong-field regime of General Relativity
论文作者
论文摘要
跟进Psaltis等人最近的分析。 [物理。莱特牧师。 125，141104（2020）]，我们表明，观察到的M87 $^*$的阴影大小可用于明确，稳健地约束圆形光子轨道附近的黑洞几何形状。黑洞度量标准的牛顿后弱场扩张的限制更为微妙，可以获得和解释，因为它们依赖于将阴影尺寸的测量与合适的理论先验相结合。我们提供的例子表明，牛顿后尺寸尺寸测量结果的限制应经过极大的谨慎处理。我们还讨论了EHT阴影测量和黑洞重力准正常模式之间的相似性和互补性。
Following up on a recent analysis by Psaltis et al. [Phys. Rev. Lett. 125, 141104 (2020)], we show that the observed shadow size of M87$^*$ can be used to unambiguously and robustly constrain the black hole geometry in the vicinity of the circular photon orbit. Constraints on the post-Newtonian weak-field expansion of the black hole's metric are instead more subtle to obtain and interpret, as they rely on combining the shadow-size measurement with suitable theoretical priors. We provide examples showing that post-Newtonian constraints resulting from shadow-size measurements should be handled with extreme care. We also discuss the similarities and complementarity between the EHT shadow measurements and black-hole gravitational quasi-normal modes.
