论文标题
测试使用SGR A*的EHT结果旋转常规指标*
Testing Rotating Regular Metrics with EHT Results of Sgr A*
论文作者
论文摘要
事件范围望远镜（EHT）观察揭示了超质量黑洞Sgr a*的第一张图像*显示直径的阴影$θ_{sh} = 48.7 \ pm 7 \，μ$，如Schwarzschild Black Black Shadow diamemets $δ= = -0.08^{+0.09} _ { - 0.09}〜\ text {（vlti）}， - 0.04^{+0.09} _ { - 0.10}〜\ text {（keck）} $。 SGR A*阴影大小在Kerr预测的$ 〜10 \％$之内，为我们提供了另一个研究强场重力性质的工具。我们使用sgr a*阴影可观察到的限制了四个独立且动机良好的指标，参数与Kerr时空不同，旋转的常规平台以及相应的无抗原空位。我们对旋转常规黑洞的偏差参数$ g $提出了限制。阴影角直径$θ_{sh} $在$1σ$区域内，在参数$ a $和$ g $上限制。我们的分析与$θ_{sh} $和$δ$上的EHT边界结论，得出结论，三个旋转的常规黑洞，即Bardeen Hayward和Simpson-Visser黑洞，以及相应的无抗Horizon Spacetimes与SGR A*的EHT结果一致。因此，这三个旋转的常规空间和Kerr黑洞在某些参数空间中是不可见的，并且不能排除前者是天体物理黑洞的强大候选者的可能性。
The Event Horizon Telescope (EHT) observation unveiled the first image of supermassive black hole Sgr A* showing a shadow of diameter $θ_{sh}= 48.7 \pm 7\,μ$as with fractional deviation from the Schwarzschild black hole shadow diameter $δ= -0.08^{+0.09}_{-0.09}~\text{(VLTI)},-0.04^{+0.09}_{-0.10}~\text{(Keck)}$. The Sgr A* shadow size is within $~10\%$ of the Kerr predictions, providing us with another tool to investigate the nature of strong-field gravity. We use the Sgr A* shadow observables to constrain metrics of four independent and well-motivated, parametrically different from Kerr spacetime, rotating regular spacetimes, and the corresponding no-horizon spacetimes. We present constraints on the deviation parameter $g$ of rotating regular black holes. The shadow angular diameter $θ_{sh}$ within $1 σ$ region, places bounds on the parameters $a$ and $g$. Together with EHT bounds on $θ_{sh}$ and $δ$ of Sgr A*, our analysis concludes that the three rotating regular black holes, viz., Bardeen Hayward, and Simpson-Visser black holes, and corresponding no-horizon spacetimes agree with the EHT results of Sgr A*. Thus, these three rotating regular spacetimes and Kerr black holes are indiscernible in some parameter space, and one can not rule out the possibility of the former being strong candidates for astrophysical black holes.
