Model-independent dark energy measurements from DESI DR2 and Planck 2015 data

Abstract Using DESI DR2 baryon acoustic oscillation (BAO) distance measurements and Planck cosmic microwave background distance priors, we have measured the dark energy density ρ X ( z ) and dark energy equation of state w X ( z ) as free functions of redshift (smoothly interpolated from values at { z i }={0, 1/3, 2/3, 1, 4/3, 2.33}), and find both to be consistent with a cosmological constant, with only deviations of ∼ 1σ for ρ X ( z ) and ∼ 2σ for w X ( z ) at z = 2/3. We also find that measuring { ρ X ( z i )} is preferred to measuring { w X ( z i )} by model selection using the Akaike Information Criterion (AIC) as well as the Bayesian Information Criterion (BIC); we confirm our earlier finding in Wang…

• NA
  National Aeronautics and Space Administration
• NS
  Nuclear Safety and Security Commission
• V
  Vetenskapsrådet

  Award: 638-2013-8993