Non-minimal Inflationary Attractors

Recently we identified a new class of (super)conformally invariant theories which al-low inflation even if the scalar potential is very steep in terms of the original conformal variables. Observational predictions of a broad class of such theories are nearly model-independent. In this paper we consider generalized versions of these models where the inflaton has a non-minimal coupling to gravity with a negative parameter ξ different from its conformal value −1/6. We show that these models exhibit attractor behavior. With even a slight increase of |ξ | from |ξ | = 0, predictions of these models for ns and r rapidly converge to their universal model-independent values corresponding to conformal coupling ξ = −1/6. These values of ns and r practically coincide with the corresponding values in the limit ξ → −∞. ar

Перевод пока недоступен