Both power-law and exponential f(G) models fit recent cosmological data better than standard ΛCDM according to information criteria, with the exponential model predicting a late-time return to deceleration.
Is gravity getting weaker at low z? Observational evidence and theoretical implications, Modified Gravity and Cosmology: An Update by the CANTATA Network- (2021) 507–537
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Testing Gauss-Bonnet Gravity with DESI BAO Data
Both power-law and exponential f(G) models fit recent cosmological data better than standard ΛCDM according to information criteria, with the exponential model predicting a late-time return to deceleration.