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.