论文标题
通过拟合SGR A*的热点数据来测试重力理论*
Testing alternative theories of gravity by fitting the hot-spot data of Sgr A*
论文作者
论文摘要
我们正在为银河中心的Sgr A*源绕的电气中性热点的动力学拟合，以标准Kerr Black Hole（BH）的各种修改为代表，与重力仪器在2018年7月22日，重力仪器观察到的三个耀斑。电动力学或反映暗物质（DM）的影响，或者在所谓的参数化肮脏的kerr空间中。我们区分具有不同轨道频率与标准Kerr BH的空间，并使用热点数据测试各种BH空位。我们表明，热点的轨道频率和位置轨道绕所考虑的BHS，适合耀斑轨道的观察到的位置和周期，并对所考虑的BH间距的参数以及此类经过修改的空间背后的重力或其他理论的参数产生相关约束。
We are fitting dynamics of electrically neutral hot-spot orbiting around Sgr A* source in Galactic center, represented by various modifications of the standard Kerr black hole (BH), to the three flares observed by the GRAVITY instrument on May 27, July 22, July 28, 2018. We consider stationary, axisymmetric and asymptotically flat spacetimes describing charged BHs in general relativity (GR) combined with non-linear electrodynamics, or reflecting influence of dark matter (DM), or in so called parameterized dirty Kerr spacetimes. We distinguish the spacetimes having different orbital frequencies from the standard Kerr BH, and test various BH spacetimes using the hot-spot data. We show that the orbital frequencies and positions of the hot-spots orbiting the considered BHs, fit the observed positions and periods of the flare orbits and give relevant constrains on the parameters of the considered BH spacetimes and the gravity or other theories behind such modified spacetimes.
