TY - JOUR
T1 - Model selection using cosmic chronometers with Gaussian Processes
AU - Melia, Fulvio
AU - Yennapureddy, Manoj K.
N1 - Publisher Copyright:
© 2018 IOP Publishing Ltd and Sissa Medialab.
PY - 2018/2/19
Y1 - 2018/2/19
N2 - 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 σH is smaller than ∼ 9% over the entire redshift range (z 20) 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 Rh=ct universe, which has only one free parameter (i.e., H0) over other models, including Planck ΛCDM . 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 Rh=ct.
AB - 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 σH is smaller than ∼ 9% over the entire redshift range (z 20) 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 Rh=ct universe, which has only one free parameter (i.e., H0) over other models, including Planck ΛCDM . 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 Rh=ct.
KW - cosmic ows
KW - cosmology of theories beyond the SM
KW - galaxy evolution
KW - star formation
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U2 - 10.1088/1475-7516/2018/02/034
DO - 10.1088/1475-7516/2018/02/034
M3 - Article
AN - SCOPUS:85043568748
SN - 1475-7516
VL - 2018
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 2
M1 - 034
ER -