Polynomial $\alpha$-attractors
  Inflationary $\alpha$-attractor models can be naturally implemented in
supergravity with hyperbolic geometry. They have stable predictions for
observables, such as $n_s=1-{2/ N_e} $, assuming that the potential in terms of
the original geometric variables, as well as its derivatives, are not singular
at the boundary of the hyperbolic disk, or half-plane. In these models, the
potential in the canonically normalized inflaton field $\varphi$ has a plateau,
which is approached exponentially fast at large $\varphi$. We call them
exponential $\alpha$-attractors. We present a closely related class of models,
where the potential is not singular, but its derivative is singular at the
boundary. The resulting inflaton potential is also a plateau potential, but it
approaches the plateau polynomially. We call them polynomial
$\alpha$-attractors. Predictions of these two families of attractors completely
cover the sweet spot of the Planck/BICEP/Keck data. The exponential ones are on
the left, the polynomial are on the right.
