Nonminimal coupling and inflationary attractors
  We show explicitly how the T model, E model, and Hilltop inflations are
obtained from the general scalar-tensor theory of gravity with arbitrary
conformal factors in the strong coupling limit. We argue that $\xi$ attractors
can give any observables $n_s$ and $r$ by this method. The existence of
attractors imposes a challenge to distinguish different models.
