Reconstruction of extended inflationary potentials for attractors
  We give the procedure to reconstruct the extended inflationary potentials for
attractors and use the $\alpha$ attractor and the constant-roll model as
examples to show how to reconstruct the class of extended inflationary
potentials in the strong coupling limit. We also derive the strong coupling
condition which the coupling constant $\xi$ satisfies. The class of extended
inflationary potentials has the same attractor, and the reconstructed extended
inflationary potentials are consistent with the observational constraints. The
existence of the attractors from extended inflationary models further
challenges the model discrimination just by the observables $n_s$ and $r$.
