A new consistency test for ΛCDM cosmology using galaxy surveys

Jinglan Zheng, Gong-Bo Zhao, Yuting Wang, Xiaoyong Mu, Ruiyang Zhao, Weibing Zhang, Shuo Yuan, David Bacon, Kazuya Koyama

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Abstract

We propose a new consistency test for the ΛCDM cosmology using baryonic acoustic oscillations (BAO) and redshift space distortion (RSD) measurements from galaxy redshift surveys. Specifically, we determine the peak position of ƒσ 8(z) in redshift z offered by a RSD measurement, and compare it to the one predicted by the BAO observables assuming a flat ΛCDM cosmology. We demonstrate this new test using the simulated data for the DESI galaxy survey, and argue that this test complements those using the background observables alone, and is less subject to systematics in the RSD analysis, compared to traditional methods using values of ƒσ 8(z) directly.
Original languageEnglish
Article number065016
Number of pages7
JournalResearch in Astronomy and Astrophysics
Volume22
Issue number6
DOIs
Publication statusPublished - 26 May 2022

Keywords

  • Cosmology
  • (cosmology:) dark energy
  • galaxies: distances and redshifts
  • UKRI
  • STFC

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