http://arxiv.org/abs/1506.03253
We investigate the observational constraints on the modified gravity, which combines the $R^{2-q}$ inflation with the power-law and exponential types of the viable $f(R)$ dark energy models. We obtain the constraints on the deviation power $q$ as well as the parameters in $f(R)$ by using the CosmoMC package. The allowed ranges of the spectral index and tensor-to-scalar ratio from the Planck data are highly restricted, resulting in $q < 2.66 \times 10^{-2}$ and $2.17 \times 10^{-2}$ for the power-law and exponential types of $f(R)$ gravity, respectively.
C. Geng, C. Lee and S. Lin
Thu, 11 Jun 15
20/55
Comments: 14 pages, 4 figures
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