Extracting high-order cosmological information in galaxy surveys with power spectra
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2022
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| _version_ | 1866929319566114816 |
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| author | Wang, Yuting Zhao, Gong-Bo Koyama, Kazuya Percival, Will J. Takahashi, Ryuichi Hikage, Chiaki Gil-Marín, Héctor Hahn, ChangHoon Zhao, Ruiyang Zhang, Weibing Mu, Xiaoyong Yu, Yu Zhu, Hong-Ming Ge, Fei |
| author_facet | Wang, Yuting Zhao, Gong-Bo Koyama, Kazuya Percival, Will J. Takahashi, Ryuichi Hikage, Chiaki Gil-Marín, Héctor Hahn, ChangHoon Zhao, Ruiyang Zhang, Weibing Mu, Xiaoyong Yu, Yu Zhu, Hong-Ming Ge, Fei |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2202_05248 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Extracting high-order cosmological information in galaxy surveys with power spectra Wang, Yuting Zhao, Gong-Bo Koyama, Kazuya Percival, Will J. Takahashi, Ryuichi Hikage, Chiaki Gil-Marín, Héctor Hahn, ChangHoon Zhao, Ruiyang Zhang, Weibing Mu, Xiaoyong Yu, Yu Zhu, Hong-Ming Ge, Fei Cosmology and Nongalactic Astrophysics 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. |
| title | Extracting high-order cosmological information in galaxy surveys with power spectra |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2202.05248 |