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Viscous matter in modified $f(R)$-gravity: Hubble tension attenuation with DESI and SH0ES data
We study the late-time dynamics of the Universe in a modified metric $f(R)$ gravity model formulated in the Jordan frame. The standard $Λ$CDM model is additionally deformed to include a non-equilibrium effect on matter dynamics, represented via a bulk viscosity coefficient. We impose an additional c
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