HIGHLIGHTS
SUMMARY
Especially between the values derived from some local measurements of the Universe expansion (of the order of 74 km s-1 Mpc-1, see e_g Wong et_al 2020 and Riess et_al 2022), and the value expected from the analysis of the Cosmic Microwave Background (CMB) in the standard CDM model, 67.4 ± 0.5 km s-1 Mpc-1 (Planck Collaboration et_al 2020). The use of the Hβ line for this purpose is also possible in principle but faces more problems - either related to the fact that time-delay measurements are collected from various . . .
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