nLab
Hubble's law

Reference

General

See also

• Wikipedia, Hubble’s law

Possible tension of model with observation

Possible tensions in the standard model of cosmology, regarding determination of the Hubble constant in the early and late universe, apparently observed by various groups, since the late 2010s:

review:

• L. Verde T. Treu, A.G. Riess, Tensions between the Early and the Late Universe (arXiv:1907.10625)

Indication that the tension is not in the data but in systematic errors:

• Freedman et al. The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch (arxiv:1907.05922)