论文标题
爬出阴影：用黑洞图像构建距离梯子
Climbing out of the shadows: building the distance ladder with black hole images
论文作者
论文摘要
在精确的宇宙学时代，寻找新的和竞争性的探针来估计宇宙学参数变得至关重要，这是为了找到当前宇宙学紧张局势/差异的答案。在这项工作中，我们显示了使用超大黑洞（SMBH）阴影观察到距离梯子的锚点的可能性，代替了通常用于此目的的源，例如Cepheid变量星。与标准方法相比，SMBH的使用具有不需要固定在哈勃流动外部距离校准器的优势，因为可以估计阴影的物理大小知道SMBH的质量。此外，SMBH应该居住在所有星系的中心，这原理意味着我们可以在任何超新星类型的IA型宿主星系中测量阴影的大小。假设可以准确且可靠地估计SMBH的质量，我们发现哈勃常数可以用$ \ of10 \％$精度来限制，即使考虑到基于地面的干涉仪的当前实验设计，通过基于SMBH质量函数（BHMF）的特定选择来构建SMBH目录，我们预测了对哈勃常数的约束，发现$ \ of4 \％$的精度可以在未来的干涉仪上触及。
In the era of precision cosmology it has became crucial to find new and competitive probes to estimate cosmological parameters, in an effort of finding answers to the current cosmological tensions/discrepancies. In this work, we show the possibility of using observations of Super Massive Black Hole (SMBH) shadows as an anchor for the distance ladder, substituting the sources usually exploited for such purpose, such as Cepheid variable stars. Compared to the standard approaches, the use of SMBH has the advantage of not needing to be anchored with distance calibrators outside the Hubble flow since the shadows physical size can be estimated knowing the mass of the SMBH. Furthermore, SMBH are supposed to inhabit the center of all galaxies which, in principle, means that we can measure the size of the shadows in any Supernova type Ia host galaxy. Under the assumption that the mass of the SMBH can be accurately and reliably estimated, we find that the Hubble constant can be constrained with a $\approx10\%$ precision even considering current experimental design of ground-based interferometers. By constructing a SMBH catalogue based on a specific choice of the SMBH Mass Function (BHMF), we forecast the constraints on the Hubble constant, finding that a precision of $\approx4\%$ may be within reach of future interferometers.
