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.
Inflationary observables in $F(R)$ gravity
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abstract
We present phenomenological signatures for a modified gravity model f(R), constructed with linear, quadratic, cubic and quartic terms. The obtained signatures satisfy current phenomenological bounds reported by PLANCK and BICEP3. Furthermore, two of the model solutions $\sigma_1$ and $\sigma_2$ seem to favor a much lower value for the tensor-to-scalar ratio $0.0005<r_{\sigma_1}<0.0015$ and $r_{\sigma_2}<0.00015$ than the current reported experimental bounds. The results we obtained are quantitatively similar to those presented in previous studies for $R^3$ models.
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gr-qc 1years
2024 1verdicts
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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.