Model Selection Using Cosmic Chronometers with Gaussian Processes
  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.
