论文标题
黑洞光子环的形状：强场一般相对性的精确测试
The Shape of the Black Hole Photon Ring: A Precise Test of Strong-Field General Relativity
论文作者
论文摘要
我们基于黑洞光子环的通用干涉标志，提出了强场一般相对性（GR）的新测试。光子环是狭窄的环形特征，由GR预测，但尚未观察到，它出现在黑洞附近的源图像上。它是由于在事件范围的几个Schwarzschild Radii中的极端弯曲引起的，并提供了Kerr几何形状不稳定的绑定光子轨道的直接探针。我们表明，可观察到的光子环的精确形状对天文源谱非常不敏感，因此可以用作GR的严格测试。我们预测，针对M87*的量身定制的空间干扰素实验可以测试源的KERR性质至次级水平。
We propose a new test of strong-field general relativity (GR) based on the universal interferometric signature of the black hole photon ring. The photon ring is a narrow ring-shaped feature, predicted by GR but not yet observed, that appears on images of sources near a black hole. It is caused by extreme bending of light within a few Schwarzschild radii of the event horizon and provides a direct probe of the unstable bound photon orbits of the Kerr geometry. We show that the precise shape of the observable photon ring is remarkably insensitive to the astronomical source profile and can therefore be used as a stringent test of GR. We forecast that a tailored space-based interferometry experiment targeting M87* could test the Kerr nature of the source to the sub-sub-percent level.
