Questioning the H₀ tension via the look-back time

Salvatore Capozziello , Giuseppe Sarracino , Alessandro D. A. M. Spallicci (1)

1 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace

The Hubble tension is investigated taking into account the cosmological look-back time. Specifically, considering a single equation, widely used in standard cosmology, it is possible to recover both values of the Hubble constant H₀ reported by the SH0ES and Planck collaborations: the former is obtained through cosmological ladder methods (e.g. Cepheids, Supernovae Type IA) and the latter through measurements of the Cosmic Microwave Background. Also, other values obtained in the literature are achieved with the same approach. We conclude that the Hubble tension can be removed if the look-back time is correctly referred to the redshift where the measurement is performed.

Keywords: Observational cosmology; Hubble-Lemaître constant; Look-back time; Astrophysics - Cosmology and Nongalactic Astrophysics; General Relativity and Quantum Cosmology; High Energy Physics - Theory

Domains: Sciences of the Universe [physics]

Salvatore Capozziello, Giuseppe Sarracino, Alessandro D. A. M. Spallicci. Questioning the H₀ tension via the look-back time. Physics of the Dark Universe, 2023, 40, ⟨10.1016/j.dark.2023.101201⟩. ⟨insu-04043842⟩