Using non-DESI data to confirm and strengthen the DESI 2024 spatially flat w0waCDM cosmological parametrization result

We use a combination of Planck cosmic microwave background (CMB) anisotropy data and non-CMB data that include Pantheon+type Ia supernovae (SNIa), Hubble parameter [H(z)], growth factor (fσ8) measurements, and a collection of baryon acoustic oscillation (BAO) data, but not recent DESI 2024 BAO measurements, to confirm the DESI 2024 (DESI+CMB+PantheonPlus) data compilation support for dynamical dark energy with an evolving equation of state parameter w(z)=w0+waz/(1+z). From our joint compilation of CMB and non-CMB data, in a spatially-flat cosmological model, we obtain w0=-0.850±0.059 and wa=-0.59-0.22+0.26 and find that this dynamical dark energy is favored over a cosmological constant by ∼2σ. Our data constraints on the flat w0waCDM parametrization are slightly more restrictive than the DESI 2024 constraints, with the DESI 2024 and our values of w0 and wa differing by -0.27σ and 0.44σ, respectively. Our data compilation slightly more strongly favors the flat w0waCDM model over the flat ΛCDM model than does the DESI 2024 data compilation. We note that our CMB and non-CMB data w0waCDM parametrization cosmological constraints are discrepant at 2.7σ, a little larger than the 1.9σ discrepancy between DESI DR1 BAO and CMB data flat ΛCDM model cosmological constraints. We also show that if we remove the Pantheon+SNIa contribution from the non-CMB data, for the w0waCDM parametrization we still find tension between P18 and non-CMB data (2.5σ) and P18+lensing and non-CMB data (2.4σ). Even after the exclusion of Pantheon+SNIa data the ΛCDM model is still disfavored at ∼2σ c.l.