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Uncorrelated estimations of $H_0$ redshift evolution from DESI baryon acoustic oscillation observations
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abstract
The Dark Energy Spectroscopic Instrument (DESI) collaboration recently released the first year data of baryon acoustic oscillations (BAOs). Based on the five different tracers, the cosmological constraint shows a hint of deviation from the standard $\Lambda$CDM 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 the flat $\Lambda$CDM 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 $6.4 \sigma$, which can naturally resolve the Hubble tension. To avoid statistical effects caused by the binning methods, we tested other three different binning methods and also found a decreasing trend. It may be due to dynamical dark energy or modified gravity.
Forward citations
Cited by 3 Pith papers
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BAO miscalibration cannot rescue late-time solutions to the Hubble tension
Even after rescaling BAO data to prefer H0≈73 km/s/Mpc, none of six tested late-time dark-energy models can resolve the Hubble tension once unanchored SNeIa and CMB geometry are included.
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Can cosmic voids ease the Hubble tension? Local expansion in $w_0w_a$CDM
A KBC-like local void lowers the SH0ES–Planck Hubble tension to about 2σ but cannot fully resolve it, and evolving dark energy shifts the required void depth by only ~1%.
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