The Pantheon+ analysis: cosmological constraints

This work features an increased sample size from the addition of multiple cross-calibrated photometric systems of SNe covering an increased redshift span, and improved treatments of systematic uncertainties in comparison to the original Pantheon analysis, which together result in a factor of 2 improvement in cosmological constraining power.

For a flat {Lambda}CDM model, we find {Omega}_M_=0.334+/-0.018 from SNe Ia alone. For a flat w_0_CDM model, we measure w_0_=-0.90+/-0.14 from SNeIa alone, H_0_=73.5+/-1.1km/s/Mpc when including the Cepheid host distances and covariance (SH0ES), and w_0_=-0.978_-0.031_^+0.024^ when combining the SN likelihood with Planck constraints from the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO); both w_0_ values are consistent with a cosmological constant.