A Critical Discussion on the H0 Tension †

Abstract

A critical discussion on the (Formula presented.) Hubble constant tension is presented by considering both early and late-type observations. From recent precise measurements, discrepancies emerge when comparing results for some cosmological quantities obtained at different redshifts. We highlight the most relevant measurements of (Formula presented.) and propose potential ideas to solve its tension. These solutions concern the exploration of new physics beyond the (Formula presented.) CDM model or the evaluation of (Formula presented.) by other methods. In particular, we focus on the role of the look-back time.