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A Cosmological Full-shape Power Spectra Analysis Using Pre- and Post-reconstructed Density Fields by Zhang, Weibing; Zhao, Ruiyang; Mu, Xiaoyong; Koyama, Kazuya; Takahashi, Ryuichi; Wang, Yuting; Zhao, Gong-Bo is a scholarly article available to read on EtoBox.

What is A Cosmological Full-shape Power Spectra Analysis Using Pre- and Post-reconstructed Density Fields about?

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.

Author

Zhang, Weibing; Zhao, Ruiyang; Mu, Xiaoyong; Koyama, Kazuya; Takahashi, Ryuichi; Wang, Yuting; Zhao, Gong-Bo

Published

2025

Language

EN