Uncorrelated estimations of H₀ redshift evolution from DESI baryon acoustic oscillation observations

The Dark Energy Spectroscopic Instrumnet (DESI) collaboration recently released the first year data of baryon acoustic oscillations (BAOs). Basing on the five different tracers, the cosmological constraint shows a hint of deviation from the standard ΛCDM model. In this letter, We combine the DESI BAOs with other cosmic probes to constrain the evolution of Hubble constant as a function of redshift in flat ΛCDM model. The non-parametric method is used to estimate the value of Hubble constant at different redshift bins. The correlation among different bins are removed by diagonalizing the covariance matrix. The joint data sample demonstrate a decreasing trend of Hubble constant with a significance of 8.6 σ, which can naturally resolve the Hubble tension. It may be due to dynamical dark energy or modified gravity.