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- Title
Testing Cosmic Acceleration from the Late-Time Universe.
- Authors
Lozano Torres, Jose Agustin
- Abstract
We investigate the accelerated cosmic expansion in the late universe and derive constraints on the values of the cosmic key parameters according to different cosmologies such as Λ CDM, wCDM, and w 0 w a CDM. We select 24 baryon acoustic oscillation (BAO) uncorrelated measurements from the latest galaxy surveys measurements in the range of redshift z ∈ [ 0.106 , 2.33 ] combined with the Pantheon SNeIa dataset, the latest 33 H (z) measurements using the cosmic chronometers (CCs) method, and the recent Hubble constant value measurement measured by Riess 2022 (R22) as an additional prior. In the Λ CDM framework, the model fit yields Ω m = 0.268 ± 0.037 and Ω Λ = 0.726 ± 0.023 . Combining BAO with Pantheon plus the cosmic chronometers datasets we obtain H 0 = 69.76 ± 1.71 km s − 1 Mpc − 1 and the sound horizon result is r d = 145.88 ± 3.32 Mpc. For the flat wCDM model, we obtain w = − 1.001 ± 0.040 . For the dynamical evolution of the dark energy equation of state, w 0 w a CDM cosmology, we obtain w a = − 0.848 ± 0.180 . We apply the Akaike information criterion approach to compare the three models, and see that all cannot be ruled out from the latest observational measurements.
- Subjects
PHYSICAL cosmology; PARAMETER estimation; CHRONOMETERS; HUBBLE constant; UNIVERSE
- Publication
Astronomy (2674-0346), 2023, Vol 2, Issue 4, p300
- ISSN
2674-0346
- Publication type
Article
- DOI
10.3390/astronomy2040020