论文标题
黑洞光子环的通用极化特征
Universal Polarimetric Signatures of the Black Hole Photon Ring
论文作者
论文摘要
黑洞图像呈现出增强亮度的环形区域。在没有传播效应的情况下，该“光子环”具有通用特征，这些特征完全受一般相对论的控制，并且独立于发射的细节。在这里，我们表明黑洞的极化图像也显示了通用性能。特别是，光子环表现出一种自相似的极化模式，该模式编码了黑洞旋转。我们探索了长干涉基准的光子环的相应通用极化特征，并提出了一种使用稀疏干涉阵列测量黑洞旋转的方法。这些签名可以通过将未来的事件地平线望远镜扩展到空间，从而实现M87中超质量黑洞的自旋测量，以及强场态度的一般相对性的精确测试。
Black hole images present an annular region of enhanced brightness. In the absence of propagation effects, this "photon ring" has universal features that are completely governed by general relativity and independent of the details of the emission. Here, we show that the polarimetric image of a black hole also displays universal properties. In particular, the photon ring exhibits a self-similar pattern of polarization that encodes the black hole spin. We explore the corresponding universal polarimetric signatures of the photon ring on long interferometric baselines, and propose a method for measuring the black hole spin using a sparse interferometric array. These signatures could enable spin measurements of the supermassive black hole in M87, as well as precision tests of general relativity in the strong field regime, via a future extension of the Event Horizon Telescope to space.
