A critical discussion on the $H_0$ tension

Understand

A critical discussion on the $H_0$ 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 $H_0$ and propose potential ideas to solve its tension.
• These solutions concern the exploration of new physics beyond the $\Lambda$CDM model or the evaluation of $H_0$ by other methods.