论文标题
用功率光谱在银河系调查中提取高阶宇宙学信息
Extracting high-order cosmological information in galaxy surveys with power spectra
论文作者
论文摘要
重建方法是在十多年前提出的，以增强在Galaxy Redshift Surveys中测得的重型声音振荡的信号，这是暗能量的关键探针之一。在将观测到的星系调查中观察到的过度繁殖回到其初始位置之后，重建的密度场更接近线性高斯磁场，高阶信息回到了功率谱。我们发现，通过共同分析从前和后结构后的星系样品测量的功率谱，可以有效提取$ 2 $ - 点功率谱以外的高阶信息，这通常仅使用前或后重建的银河系样品在分析时获得信息获得。这打开了一个窗口，在限制宇宙学模型时，可以轻松使用高阶信息。
The reconstruction method was proposed more than a decade ago to boost the signal of baryonic acoustic oscillations measured in galaxy redshift surveys, which is one of key probes for dark energy. After moving the observed overdensities in galaxy surveys back to their initial position, the reconstructed density field is closer to a linear Gaussian field, with higher-order information moved back into the power spectrum. We find that by jointly analysing power spectra measured from the pre- and post-reconstructed galaxy samples, higher-order information beyond the $2$-point power spectrum can be efficiently extracted, which generally yields an information gain upon the analysis using the pre- or post-reconstructed galaxy sample alone. This opens a window to easily use higher-order information when constraining cosmological models.
