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We consider cosmological models in which Dark Matter (DM) and Dark Energy(DE) are described by a single component, dubbed Unified Dark Matter (UDM)models, in which the DE-like part can have an equation state $<-1$ at latetimes without violating the null energy condition. In this paper, weinvestigate whether this feature can relieve the Hubble tension. We perform aBayesian analysis of the model using SNIa data from Pantheon, the CMB distanceprior from Planck, and the prior on the absolute magnitude $M$ of SNIa fromSH0ES. The data suggests a smooth transition taking place at redshifts $z_{\rmt} \simeq 2.85$, which provides a value $H_0=69.64\pm 0.88$ for the Hubbleconstant, slightly alleviating the tension by $\sim 1.5 \sigma$. We alsodiscuss the importance of using the prior on $M$ for constraining this model.

Bayesian analysis of Unified Dark Matter models with fast transition: can they alleviate the $H_{0}$ tension?