https://doi.org/10.1140/epjc/s10052-023-11651-3
Regular Article - Theoretical Physics
Low-redshift estimates of the absolute scale of baryon acoustic oscillations
1
Observatório Nacional, 20921-400, Rio de Janeiro, RJ, Brazil
2
INFN Sezione di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
b
ruchika.ruchika@roma1.infn.it
Received:
30
March
2023
Accepted:
21
May
2023
Published online:
11
June
2023
Measurements of the characteristic length scale of the baryon acoustic oscillations (BAO) provide a robust determination of the distance-redshift relation. Currently, the best (sub-per cent) estimate of
at the drag epoch is provided by Cosmic Microwave Background (CMB) observations assuming the validity of the standard
CDM model at
. Therefore, inferring
from low-z observations in a model-independent way and comparing its value with CMB estimates provides a consistency test of the standard cosmology and its assumptions at high-z. In this paper, we address this question and estimate the absolute BAO scale combining angular BAO measurements and type Ia Supernovae data. Our analysis uses two different methods to connect these data sets and finds a good agreement between the low-z estimates of
with the CMB sound horizon at drag epoch, regardless of the value of the Hubble constant
considered. These results highlight the robustness of the standard cosmology at the same time that they also reinforce the need for more precise cosmological observations at low-z.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjc/s10052-023-11651-3.
© The Author(s) 2023
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