Improving constraint onΩ_(m)from SDSS using marked correlation functions  

作　　者：Limin Lai Jiacheng Ding Xiaolin Luo Yizhao Yang Zihan Wang Keshi Liu Guanfu Liu Xin Wang Yi Zheng Zhaoyu Li Le Zhang Xiao-Dong Li 

机构地区：[1]School of Physics and Astronomy,Sun Yat-sen University Zhuhai Campus,Zhuhai 519082,China [2]Department of Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [3]Department of Astronomy,Tsinghua University,Beijing 100084,China [4]CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area,SYSU,Zhuhai 519082,China [5]Peng Cheng Laboratory,Shenzhen 518000,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第8期207-224,共18页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Ministry of Science and Technology of China(Grant Nos.2020SKA0110401,2020SKA0110402,and 2020SKA0110100);the National Key Research and Development Program of China(Grant Nos.2018YFA0404504,and 2018YFA0404601);the National Natural Science Foundation of China(Grant Nos.11890691,12205388,12220101003,12122301,12233001,and 12073088);the China Manned Space Project(Grant No.CMS-CSST-2021(A02,A03,A04,B01));the Major Key Project of PCL;the 111 project(Grant No.B20019);the Shanghai Natural Science Research Grant(Grant No.21ZR1430600);sponsorship from Yangyang Development Fund。

摘　　要：Large-scale structure(LSS)surveys will increasingly provide stringent constraints on our cosmological models.Recently,the density-marked correlation function(MCF)has been introduced,offering an easily computable density-correlation statistic.Simulations have demonstrated that MCFs offer additional,independent constraints on cosmological models beyond the standard two-point correlation(2PCF).In this study,we apply MCFs for the first time to SDSS CMASS data,aiming to investigate the statistical information regarding clustering and anisotropy properties in the Universe and assess the performance of various weighting schemes in MCFs,and finally obtain constraints onΩ_(m).Upon analyzing the CMASS data,we observe that,by combining different weights(α=[-0.2,0,0.2,0.6]),the MCFs provide a tight and independent constraint on the cosmological parameterΩ_(m),yieldingΩ_(m)=0.293±0.006 at the 1σlevel,which represents a significant reduction in the statistical error by a factor of 3.4 compared to that from 2PCF.Our constraint is consistent with recent findings from the small-scale clustering of BOSS galaxies(Zhai et al.Astronphys.J.948,99(2023))within the 1σlevel.However,we also find that our estimate is lower than the Planck measurements by about 2.6σ,indicating the potential presence of new physics beyond the standard cosmological model if all the systematics are fully corrected.The method outlined in this study can be extended to other surveys and datasets,allowing for the constraint of other cosmological parameters.Additionally,it serves as a valuable tool for forthcoming emulator analysis on the Chinese Space Station Telescope(CSST).

关 键 词：large scale structure of universe dark energy cosmological parameters marked weighted correlation function 

分 类 号：O174[理学—数学]