Viscous matter in modified $f(R)$-gravity: Hubble tension attenuation with DESI and SH0ES data

Elisa Fazzari, Nakia Carlevaro, Giovanni Montani

We study the late-time dynamics of the Universe in a modified metric $f(R)$ gravity model formulated in the Jordan frame. The standard $\Lambda$CDM model is additionally deformed to incl…