For a quartic f(R) inflation model, two solutions predict tensor-to-scalar ratios around 0.0005 to 0.0015, which are consistent with Planck and BICEP/Keck bounds but below current detection limits.
Starobinsky, A New Type of Isotropic Cosmological Models Without Singularity Phys
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Inflationary observables in $F(R)$ gravity
For a quartic f(R) inflation model, two solutions predict tensor-to-scalar ratios around 0.0005 to 0.0015, which are consistent with Planck and BICEP/Keck bounds but below current detection limits.