Three f(G) gravity models can be fit to expansion data, but the growth data require Ωm near 1, a boundary value that undermines the claimed viability.
Instability of 1-loop superstring cosmology,
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Constraints on multi-fluid cosmology in modified Gauss-Bonnet gravity models with different observational data sets
Three f(G) gravity models can be fit to expansion data, but the growth data require Ωm near 1, a boundary value that undermines the claimed viability.