来自银河系中心恒星运动的对度量-仿射引力黑洞的约束

由度规-仿射蜂巢模型产生的黑洞：基于$M87^*$和$Sgr A^*$阴影及银河微类星体准周期振荡的约束

Constrain from shadows of $M87^*$ and $Sgr A^*$ and quasiperiodic oscillations of galactic microquasars on a black hole arising from metric-affine bumblebee model

本研究利用M87*和Sgr A*的阴影观测及微类星体高频准周期振荡，约束度规-仿射蜂巢模型中自由洛伦兹破缺参数，并分析粒子运动与拱线频率。

Black holes and the supermassive compact object at the Galactic center: multi-arts of thought and nature

This is an invited commentary on the Nobel Prize in Physics 2020 which was awarded to Roger Penrose "for the discovery that black hole formation is a robust prediction of the general theory of relativity," and Reinhard Genzel and Andrea Ghez "for the discovery of a supermassive compact object at the center of our galaxy."

Towards an observational test of black hole versus naked singularity at the galactic center

While the event horizon of a black hole could cast a shadow that was observed recently, a central singularity without horizon could also give rise to such a feature. This leaves us with a question on the nature of the supermassive black holes at the galactic centers, and if they admit an event horizon necessarily. We point out that observations of motion of stars around the galactic center should give a clear idea of the nature of this central supermassive object. We examine and discuss here recent developments that indicate intriguing behavior of the star motions that could possibly distingui…

Constraining the nature of the Galactic center black hole Sgr A* with present and future observations

The Galactic center is an ideal laboratory to study strong-field general relativistic phenomena, as the supermassive black hole Sgr A* has the biggest angular Schwarzschild radius among all black holes. This article presents three different ways of using the immediate surroundings of Sgr A* as a probe in order to either constrain its spin, or even test the very nature of this compact object.