Kinetically Modified Non-Minimal Chaotic Inflation

TL;DR

This paper explores supersymmetric and non-supersymmetric chaotic inflation models with nonminimal gravity coupling and kinetic mixing, successfully matching observational data while maintaining theoretical consistency up to the Planck scale.

Contribution

It introduces a kinetically modified non-minimal chaotic inflation framework that aligns with observational constraints and preserves perturbative unitarity.

Findings

Models fit Bicep2/Keck and Planck data for a range of parameters.

Inflation occurs at sub-Planckian field values.

Theories remain perturbatively unitary up to the Planck scale.

Abstract

We consider Supersymmetric (SUSY) and non-SUSY models of chaotic inflation based on the phi^n potential with 2<=n<=6. We show that the coexistence of a nonminimal coupling to gravity, fR=1+cR phi^(n/2), with a kinetic mixing of the form fK=cK fR^m can accommodate values of the spectral index, ns, and the tensor-to-scalar ratio, r, favored by the Bicep2/Keck Array and Planck results for 0<=m<=4 and 2.5x10^(-4)<=rRK=cR/cK^{n/4}<=1, where the upper limit is not imposed for n=2. Inflation can be attained for subplanckian inflaton values with the corresponding effective theories retaining the perturbative unitarity up to the Planck scale.