测量黑洞光子环的形状
Measuring the shape of a black hole photon ring
摘要：
广义相对论预言，黑洞附近的引力透镜将在图像上产生狭窄的“光子环”。基于Johnson，Lupsasca等人最近的工作，专注于圆环，我计算了任意形状和强度的窄特征的长基线干涉签名。对于每个基线角，形状信息包含在作为基线长度的函数的复可见度的振荡频率中。这些结果提高了测量光子环详细形状并与广义相对论的精确预测进行比较的可能性。
英文摘要：
General relativity predicts that gravitational lensing near black holes will produce narrow "photon rings" on images. Building on recent work of Johnson, Lupsasca et al. focusing on circular rings, I calculate the long-baseline interferometric signature of a narrow feature of arbitrary shape and intensity. The shape information is contained in the oscillation frequencies of the complex visibility as a function of baseline length, for each baseline angle. These results raise the possibility of measuring the detailed shape of a photon ring and comparing to the precise predictions of general relativity.
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