Papers › Cosmic chronometers, Pantheon+ supernovae, and quasars favor coasting cosmologies over...
Cosmic chronometers, Pantheon+ supernovae, and quasars favor coasting cosmologies over the flat ΛCDM model
Peter Raffai, Adrienn Pataki, Rebeka L. Böttger, Alexandra Karsai, Gergely Dálya
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We test and compare coasting cosmological models with curvature parameters k={ -1,0,+1 } in H₀² c⁻² units and the flat ΛCDM model by fitting them to cosmic chronometers (CC), the Pantheon+ sample of type Ia supernovae (SNe), and standardized quasars (QSOs). We used the \texttt{emcee} code for fitting CC data, a custom Markov Chain Monte Carlo implementation for SNe and QSOs, and Anderson-Darling tests for normality on normalized residuals for model comparison. Best-fit parameters are presented, constrained by data within redshift ranges z≤2 for CCs, z≤2.3 for SNe, and z≤7.54 for QSOs. Coasting models, particularly the flat coasting model, are generally favored over the flat ΛCDM model. The overfitting of the flat ΛCDM model to Pantheon+ SNe and the large intrinsic scatter in QSO data suggest a need to refine error estimates in these datasets. We also highlight the seemingly fine-tuned nature of either the CC data or Ω_(m,0) in the flat ΛCDM model to an H₁=H₀ coincidence when fitting H(z)=H₁z+H₀, a natural feature of coasting models.
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