ACT, SPT, and chaotic inflation

TL;DR

This paper demonstrates that a generalized chaotic inflation model with nonminimal coupling aligns well with recent cosmological data, particularly predicting a tensor-to-scalar ratio around 0.01.

Contribution

It introduces a simple extension of chaotic inflation with nonminimal coupling that fits current observational data.

Findings

Model predicts r ≈ 0.01 consistent with data

Generalization improves fit to latest cosmological observations

Supports nonminimal coupling as a viable inflationary mechanism

Abstract

We show that the simplest generalization of the chaotic inflation model $\tfrac12 {m^{2}\phi^{2}}$ with nonminimal coupling to gravity $(1+\phi) R$ provides a good match to the results of the latest data release of the Atacama Cosmology Telescope, with $r \approx10^{-2}$.