2024/04/22 by Deng Wang, Wang, Deng · 1 citation
Engineering · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Manufacturing Process and Optimization
paper · pdf · doi:10.48550/arxiv.2404.13833
openalex publication_date 2024/04/22 · openalex created_date 2024/04/25 · openalex updated_date 2026/07/28
We demonstrate that the constraints on the evolution of dark energy implemented by the DESI collaboration may be insufficient or incomplete using their own BAO data. Using large enough prior ranges for the present-day equation of state of dark energy ω0 and amplitude of dark energy evolution ωa, we obtain the complete 1 σ and 2 σ constraints ω0=1.04+0.91+2.00-1.00-1.90 and ωa=-7.4+3.8+6.8-3.2-7.3 indicating a beyond 2 σ preference of quintessence-like dark energy today and an evidence of evolving dark energy at beyond 2 σ CL, respectively. Our results are different from ω0=-0.55+0.39-0.21 and the 2 σ upper limit ωa<-1.32 reported by the DESI collaboration \citeDESI:2024mwx. Employing a data combination of cosmic microwave background, DESI BAO and type Ia supernova, we obtain the 1 σ, 2 σ and 3 σ constraints ω0=-0.707+0.089+0.18+0.24-0.089-0.17-0.22 and ωa=-1.09+0.38+0.67+0.82-0.31-0.72-1.00, which reveals a ∼4 σ evidence of dynamical dark energy when the redshift z\lesssim0.1. We verify that the BAO data point from luminous red galaxies at the effective redshift z\rm eff=0.51 hardly affects the joint constraint from the data combination of cosmic microwave background, DESI BAO and type Ia supernova. We also point out the shortcomings and advantages of the binning method widely used in cosmological analyses.