A log-periodic deceleration parameter in f(R,G)=R+alpha R^2+beta e^{gamma G} gravity, fit to CC, BAO and Pantheon+SHOES data, gives H0 around 71.7 to 72.8 km/s/Mpc and q0 around -0.5, but the f(R,G) parameters are chosen, not constrained.
Guth, Phys
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Reconstructing cosmic expansion in $f(R, G)$ gravity using a log-periodic deceleration model
A log-periodic deceleration parameter in f(R,G)=R+alpha R^2+beta e^{gamma G} gravity, fit to CC, BAO and Pantheon+SHOES data, gives H0 around 71.7 to 72.8 km/s/Mpc and q0 around -0.5, but the f(R,G) parameters are chosen, not constrained.