A viscous version of unimodular gravity fits late-time cosmological data as well as ΛCDM, but the fitted viscosity is consistent with zero and the claimed energy nonconservation is not statistically significant.
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Dissipative Unimodular Gravity: Linking Energy Diffusion to Bulk Viscosity as an Alternative to $\Lambda$CDM under DESI DR2 Data
A viscous version of unimodular gravity fits late-time cosmological data as well as ΛCDM, but the fitted viscosity is consistent with zero and the claimed energy nonconservation is not statistically significant.