The scalar mode mass in Jordan-frame metric f(R) gravity must exceed the Hubble scale by several orders of magnitude.
Integral F(R) gravity and saddle point condition as a remedy for the H0-tension.Nucl
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Three standard inflationary potentials remain compatible with Planck, BICEP/Keck, DESI DR2, and ACT DR6 data when placed in minimally coupled f(R,T)=R+16πGλT gravity for suitable ranges of the model parameters and coupling λ.
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On the Physical Nature of the Scalar Mode Mass in the Jordan frame of a Metric $f(R)$ gravity
The scalar mode mass in Jordan-frame metric f(R) gravity must exceed the Hubble scale by several orders of magnitude.
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Inflationary models in a minimally coupled $f(R,T)$ gravity: Constraints from $Planck$, BICEP/$Keck$, and ACT
Three standard inflationary potentials remain compatible with Planck, BICEP/Keck, DESI DR2, and ACT DR6 data when placed in minimally coupled f(R,T)=R+16πGλT gravity for suitable ranges of the model parameters and coupling λ.