Reconstruction of constant slow-roll inflation
  By using the relations between the slow-roll parameters and the power
spectrum for the single field slow-roll inflation, we derive the scalar
spectral tilt $n_s$ and the tensor to scalar ratio $r$ for the constant
slow-roll inflation and obtain the constraint on the slow-roll parameter $\eta$
from the Planck 2015 results. The inflationary potential for the constant
slow-roll inflation is then reconstructed in the framework of both general
relativity and scalar-tensor theory of gravity, and compared with the recently
reconstructed E model potential. In the strong coupling limit, we show that the
$\eta$ attractor is reached.
