Revealing the late-time transition of H0: relieve the Hubble crisis

The discrepancy between the value of the Hubble constant H-0 measured from the local distance ladder and from the cosmic microwave background is the most serious challenge to the standard ACDM model. Various models have been proposed to solve or relieve it, but no satisfactory solution has been given until now. Here, we report a late-time transition of H-0, i.e. H-0 changes from a low value to a high one from early to late cosmic time, by investigating the Hubble parameter H(z) data based on the Gaussian process (GP) method. This finding effectively reduces the Hubble crisis by 70 percent. Our results are also consistent with the descending trend of H-0 measured using time-delay cosmography of lensed quasars at 1 sigma confidence level, and support the idea that the Hubble crisis arises from new physics beyond the standard ACDM model. In addition, in the ACDM model and wCDM model, there is no transition behaviour of H-0.

Automated summary

This study investigates the late-time transition of the Hubble constant H-0, finding that it changes from a low value to a high value from early to late cosmic time. This discovery effectively reduces the Hubble crisis by 70 percent and supports the idea of new physics beyond the standard ACDM model.