论文标题
宇宙屈曲
Cosmic flexion
论文作者
论文摘要
像宇宙剪切一样，宇宙屈曲是一个相关函数，其信号起源于宇宙的大规模结构。基于宇宙剪切的观察性成功，以及大型宇宙学数据集的前所未有的质量，探索宇宙屈曲的实际约束的时候已经成熟了。与具有广泛的功率窗口功能的宇宙剪切不同，宇宙屈曲仅在小尺度上可测量，因此可以在小规模的物质功率谱上唯一地将约束放置。在这里，我们为宇宙屈曲提供了完整的理论形式主义，包括屈曲反射和剪切屈光度的两点相关性。我们介绍了测量宇宙调查（DES）的宇宙屈曲的预测，这是一项III期宇宙学调查，并评论了未来IV阶段实验时代的这些宇宙学屈曲信号的未来前景。
Cosmic flexion, like cosmic shear, is a correlation function whose signal originates from the large-scale structure of the universe. Building on the observational success of cosmic shear, along with the unprecedented quality of large-scale cosmological datasets, the time is ripe to explore the practical constraints from cosmic flexion. Unlike cosmic shear, which has a broad window function for power, cosmic flexion is only measurable on small scales and therefore can uniquely place constraints on the small-scale matter power spectrum. Here, we present a full theoretical formalism for cosmic flexion, including both flexion-flexion and shear-flexion two-point correlations. We present forecasts for measuring cosmic flexion in the Dark Energy Survey (DES), a Stage III cosmological survey, and comment on the future prospects of measuring these cosmological flexion signals in the upcoming era of Stage IV experiments.
