论文标题
在没有超新星和CMB的情况下重申宇宙加速度
Reaffirming the Cosmic Acceleration without Supernova and CMB
论文作者
论文摘要
关于超新星幅度进化的最新讨论引起了人们对晚期加速度鲁棒性的怀疑。在先前的字母中，黄通过基于宇宙年龄（页面）的参数化进行了宇宙加速度的无效测试，该参数涵盖了广泛的宇宙学模型，包括标准$λ$ Cold Dark Matter模型及其许多扩展。在这项工作中，我们将继续探索宇宙扩展历史记录，并通过页面近似。使用Baryon声学振荡（{\ IT没有} cmb先验在声学尺度上），重力强镜头时间延迟，并作为宇宙时间表的早期星系被动地发展，我们获得了$ \ gtrsim4σ$检测平面和非flat flat Page comesses cosmic加速的检测。在非反弹案的情况下，我们发现源自巴属声学振荡的空间曲率和强镜延迟之间的空间曲率之间存在$ \ gtrsim3σ$张力。讨论了含义和可能的系统学。
Recent discussions about supernova magnitude evolution have raised doubts about the robustness of the late-universe acceleration. In a previous letter, Huang did a null test of the cosmic acceleration by using a Parameterization based on the cosmic Age (PAge), which covers a broad class of cosmological models including the standard $Λ$ cold dark matter model and its many extensions. In this work, we continue to explore the cosmic expansion history with the PAge approximation. Using baryon acoustic oscillations ({\it without} a CMB prior on the acoustic scale), gravitational strong lens time delay, and passively evolving early galaxies as cosmic chronometers, we obtain $\gtrsim 4σ$ detections of cosmic acceleration for both flat and nonflat PAge universes. In the nonflat case, we find a $\gtrsim 3σ$ tension between the spatial curvatures derived from baryon acoustic oscillations and strong lens time delay. Implications and possible systematics are discussed.
