Large Field Inflation and Double $\alpha$-Attractors
  We consider a broad class of inflationary models that arise naturally in
supergravity. They are defined in terms of a parameter $\alpha$ that determines
the curvature and cutoff of these models. As a function of this parameter, we
exhibit that the inflationary predictions generically interpolate between two
attractor points. At small cutoff $\alpha$, the resulting inflationary model is
of plateau-type with $n_s = 1 - 2 / N$ and $r = 12 \alpha / N^2$. For $\alpha =
1$, these predictions coincide with predictions of the Starobinsky model and
Higgs inflation. In contrast, for large cutoff $\alpha$, the theory asymptotes
to quadratic inflation, with $n_s = 1 - 2 / N$, $r = 8 / N$. Both universal
predictions can be attributed to a stretching of the moduli space. For
intermediate values of $\alpha$, the predictions interpolate between these two
critical points, thus covering the sweet spots of both Planck and BICEP2.
