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Model Selection Using Cosmic Chronometers with Gaussian Processes
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Model Selection Using Cosmic Chronometers with Gaussian Processes
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The use of Gaussian Processes with a measurement of the cosmic expansion rate based solely on the observation of cosmic chronometers provides a completely cosmology-independent reconstruction of the Hubble constant H(z) suitable for testing different models. The corresponding dispersion sigma_H is smaller than ~9% over the entire redshift range (0 < z < 2) of the observations, rivaling many kinds of cosmological measurements available today. We use the reconstructed H(z) function to test six different cosmologies, and show that it favours the R_h=ct universe, which has only one free parameter (i.e., H_0) over other models, including Planck LCDM. The parameters of the standard model may be re-optimized to improve the fits to the reconstructed H(z) function, but the results have smaller p-values than one finds with R_h=ct.
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Cited by 1 Pith paper
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Joint constraints on $R_h=ct$ cosmology from DESI DR2 BAO, CC, and SN\textit{Ia} Pantheon$^+$ sample
ΛCDM fits the joint DESI DR2 BAO + Pantheon+ + cosmic-chronometer data better than the coasting R_h=ct model, which yields an older universe and a lower fitted H0.
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