Inflationary attractors from nonminimal coupling

TL;DR

This paper demonstrates how inflationary attractors, specifically the E model, emerge from scalar-tensor theories with nonminimal coupling, highlighting the universality and observational implications of these attractors in cosmology.

Contribution

It explicitly derives the E model attractor from general scalar-tensor theories using conformal transformations in the strong coupling limit, showing the universality of inflationary attractors.

Findings

E model attractor obtained from scalar-tensor theory

Any attractor with observables $n_s$ and $r$ can be derived

Existence of attractors complicates model differentiation

Abstract

We show explicitly how the E model attractor is obtained from the general scalar-tensor theory of gravity with arbitrary conformal factors in the strong coupling limit. By using conformal transformations, any attractor with the observables $n_s$ and $r$ can be obtained. The existence of attractors imposes a challenge to distinguish different models.