A cosmological full-shape power spectra analysis using pre- and post-reconstructed density fields
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916698013040640 |
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| author | Zhang, Weibing Zhao, Ruiyang Mu, Xiaoyong Koyama, Kazuya Takahashi, Ryuichi Wang, Yuting Zhao, Gong-Bo |
| author_facet | Zhang, Weibing Zhao, Ruiyang Mu, Xiaoyong Koyama, Kazuya Takahashi, Ryuichi Wang, Yuting Zhao, Gong-Bo |
| contents | In this work, we investigate a joint fitting approach based on theoretical models of power spectra associated with density-field reconstruction. Specifically, we consider the matter auto-power spectra before and after baryon acoustic oscillation (BAO) reconstruction, as well as the cross-power spectrum between the pre- and post-reconstructed density fields. We present redshift-space models for these three power spectra at the one-loop level within the framework of standard perturbation theory (SPT), and perform a joint analysis using three types of power spectra, and quantify their impact on parameter constraints. When restricting the analysis to wavenumbers $k \leq 0.2\,h\,\mathrm{Mpc}^{-1}$ and adopting a smoothing scale of $R_{\mathrm{s}} = 15\,h^{-1}\,\mathrm{Mpc}$, we find that incorporating all three power spectra improves parameter constraints by approximately $11\%\text{--}16\%$ compared to using only the post-reconstruction power spectrum, with the Figure of Merit (FoM) increasing by $10.5\%$. These results highlight the advantages of leveraging multiple power spectra in BAO reconstruction, ultimately enabling more precise cosmological parameter estimation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_20574 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A cosmological full-shape power spectra analysis using pre- and post-reconstructed density fields Zhang, Weibing Zhao, Ruiyang Mu, Xiaoyong Koyama, Kazuya Takahashi, Ryuichi Wang, Yuting Zhao, Gong-Bo Cosmology and Nongalactic Astrophysics In this work, we investigate a joint fitting approach based on theoretical models of power spectra associated with density-field reconstruction. Specifically, we consider the matter auto-power spectra before and after baryon acoustic oscillation (BAO) reconstruction, as well as the cross-power spectrum between the pre- and post-reconstructed density fields. We present redshift-space models for these three power spectra at the one-loop level within the framework of standard perturbation theory (SPT), and perform a joint analysis using three types of power spectra, and quantify their impact on parameter constraints. When restricting the analysis to wavenumbers $k \leq 0.2\,h\,\mathrm{Mpc}^{-1}$ and adopting a smoothing scale of $R_{\mathrm{s}} = 15\,h^{-1}\,\mathrm{Mpc}$, we find that incorporating all three power spectra improves parameter constraints by approximately $11\%\text{--}16\%$ compared to using only the post-reconstruction power spectrum, with the Figure of Merit (FoM) increasing by $10.5\%$. These results highlight the advantages of leveraging multiple power spectra in BAO reconstruction, ultimately enabling more precise cosmological parameter estimation. |
| title | A cosmological full-shape power spectra analysis using pre- and post-reconstructed density fields |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.20574 |