Extracting high-order cosmological information in galaxy surveys with power spectra

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Yuting Wang Gong-Bo Zhao Kazuya Koyama Will J. Percival Ryuichi Takahashi Chiaki Hikage Héctor Gil-Marín ChangHoon Hahn Ruiyang Zhao Weibing Zhang Xiaoyong Mu Yu Yu Hong-Ming Zhu Fei Ge

摘要： 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 new window to easily use higher-order information when constraining cosmological models.

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