Nonminimal coupling and inflationary attractors

Understand

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.