首页|Improving constraint on Ωm from SDSS using marked correlation functions

Improving constraint on Ωm from SDSS using marked correlation functions

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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.Sim-ulations 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 on Ωm.Upon analyzing the CMASS data,we observe that,by combin-ing different weights(α=[-0.2,0,0.2,0.6]),the MCFs provide a tight and independent constraint on the cosmological parameterΩm,yielding Ωm=0.293±0.006 at the 1σ level,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 1σ level.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).

large scale structure of universedark energycosmological parametersmarked weighted correlation function

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

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School of Physics and Astronomy,Sun Yat-sen University Zhuhai Campus,Zhuhai 519082,China

Department of Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

Department of Astronomy,Tsinghua University,Beijing 100084,China

CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area,SYSU,Zhuhai 519082,China

Peng Cheng Laboratory,Shenzhen 518000,China

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Ministry of Science and Technology of ChinaMinistry of Science and Technology of ChinaMinistry of Science and Technology of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaChina Manned Space Project,Grant No.CMS-CSST-2021China Manned Space Project,Grant No.CMS-CSST-2021China Manned Space Project,Grant No.CMS-CSST-2021China Manned Space Project,Grant No.CMS-CSST-2021Major Key Project of PCL111 projectShanghai Natural Science Research Grant

2020SKA01104012020SKA01104022020SKA01101002018YFA04045042018YFA0404601118906911220538812220101003121223011223300112073088A02A03A04B01B2001921ZR1430600

2024

10.1007/s11433-023-2384-4

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(8)