The paper claims f(R,L_m) gravity with matter-curvature coupling fits f_sigma8 measurements better than LambdaCDM, but the supporting comparison table contains unphysical negative LambdaCDM growth rates and no statistical test.
Observational evidence from supernovae for an accelerating universe and a cosmological constant,
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Growth Rate Analysis in $f(R,L_m)$ Gravity: A Comparative Study with \boldmath$\Lambda$CDM Cosmology
The paper claims f(R,L_m) gravity with matter-curvature coupling fits f_sigma8 measurements better than LambdaCDM, but the supporting comparison table contains unphysical negative LambdaCDM growth rates and no statistical test.