In 1919, the observation during a solar eclipse of the deflection of light rays from stars near the Sun decreed the validity of Einstein’s general relativity. One hundred years later, the image of the black hole M87* by the Event Horizon Telescope collaboration proved the existence of these fascinating objects on the one hand, and on the other, the validity of general relativistic magnetohydrodynamics (GRMHD) in the strong gravity regime. Numerical simulations have been used to model the accreting plasma around the black hole, whose emission is at the base of the synthetic images compared with data. Here, we briefly discuss the methods and the initialization employed for these simulations, and we briefly report the results of GRMHD axisymmetric simulations where a dynamo mechanism operates inside the disk, enhancing the magnetic field from its initial seed values up to those needed to explain the observed plasma emission.

中文翻译：

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测试广义相对论的一百年：从爱丁顿的日食到广义相对论的MHD

1919年，在日食期间观察到太阳附近恒星发出的光线偏转，这降低了爱因斯坦广义相对论的有效性。一百年后，Event Horizo​​n Telescope合作拍摄的黑洞M87 *图像一方面证明了这些引人入胜的物体的存在，另一方面证明了在强引力条件下广义相对论磁流体动力学（GRMHD）的有效性。数值模拟已被用来模拟黑洞周围积聚的血浆，与数据相比，其发射是合成图像的基础。在这里，我们简要讨论了用于这些仿真的方法和初始化，并简要报告了GRMHD轴对称仿真的结果，其中，发电机机制在磁盘内部运行，