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 fσ8(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 fσ8(z) directly.
@article{arxiv.2204.12647,
title = {A new consistency test for $\Lambda$CDM cosmology using galaxy surveys},
author = {Jinglan Zheng and Gong-Bo Zhao and Yuting Wang and Xiaoyong Mu and Ruiyang Zhao and Weibing Zhang and Shuo Yuan and David Bacon and Kazuya Koyama},
journal= {arXiv preprint arXiv:2204.12647},
year = {2022}
}
Comments
9 pages, 6 figures; accepted to Research in Astronomy and Astrophysics (RAA)