摘要
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 oscillations(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,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≤0.2 h Mpc^(−1)and adopting a smoothing scale of R_(s)=15 h^(−1)Mpc,we find that incorporating all three power spectra improves parameter constraints by approximately 11%–16%compared to using only the post-reconstruction power spectrum,with the Figure of Merit increasing by 10.5%.These results highlight the advantages of leveraging multiple power spectra in BAO reconstruction,ultimately enabling more precise cosmological parameter estimation.
基金
supported by the National Natural Science Foundation of China(NSFC,Grant No.12525301)
supported by the Science and Technology Facilities Council(STFC)under Grant ST/W001225/1
supported by JSPS KAKENHI grant Nos.JP22H00130 and JP20H05855
further acknowledges support form the National Key R&D Program of China No.(2022YFF0503404,2023YFA1607800,2023YFA1607803)
the National Natural Science Foundation of China(NSFC,Grant Nos.12273048 and 12422301)
the CAS Project for Young Scientists in Basic Research(No.YSBR-092)
support from the CAS Project for Young Scientists in Basic Research(No.YSBR092)
the China Manned Space Project
the New Cornerstone Science Foundation through the XPLORER Prize.
