The paper derives a lower bound λ ≈ −1.9×10⁻⁸ for the f(R,T) = R + 2λT model, but the bound is the value of λ that cancels a spurious constant of 24 in the paper's own formula Ω_Λ = 24 + λ/(4πG).
Hubble, Proc
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Constraining f(R,T) Gravity From The Dark Energy Density Parameter $\Omega_{\Lambda}$
The paper derives a lower bound λ ≈ −1.9×10⁻⁸ for the f(R,T) = R + 2λT model, but the bound is the value of λ that cancels a spurious constant of 24 in the paper's own formula Ω_Λ = 24 + λ/(4πG).