A fractional gravity model with dynamical G and scalar field fits late-time data only in the μ=0 case, mimics ΛCDM expansion, but is disfavored by BIC and yields an unphysically large universe age.
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Varying Gravity from a Modified Fractional Model: Observational Constraints and Slow-Fast Dynamics
A fractional gravity model with dynamical G and scalar field fits late-time data only in the μ=0 case, mimics ΛCDM expansion, but is disfavored by BIC and yields an unphysically large universe age.