Classically Scale Invariant Inflation and (A)gravity

TL;DR

This paper explores a classically scale-invariant extension of the standard model integrated with Agravity, focusing on inflation driven by a pseudo-Nambu-Goldstone boson, and demonstrates its compatibility with Planck data.

Contribution

It introduces a minimal, renormalizable, scale-invariant model with gravity and analyzes its inflationary dynamics using the inflaton as a pseudo-Nambu-Goldstone boson.

Findings

Inflationary predictions align with Planck data

The model achieves slow-roll inflation with a small field scenario

The effective potential is computed at one-loop level

Abstract

In this talk, I present the minimal classically scale-invariant and $CP$-symmetric extension of the standard model, containing one additional complex gauge singlet and three flavors of right-handed Majorana neutrinos, incorporated within a renormalizable framework of gravity, consistent with these symmetries; the Agravity. I particularly focus on the slow-roll inflationary paradigm within this framework, by identifying the pseudo-Nambu-Goldstone boson of the (approximate) scale symmetry with the inflaton field, constructing its one-loop effective potential, computing the slow-roll parameters and the inflationary observables, and demonstrating the compatibility of the small field inflation scenario with the latest Planck collaboration data sets.