Minimal Composite Inflation

TL;DR

This paper explores models where the inflaton is a composite fermionic field from a strongly interacting gauge theory, demonstrating successful inflation with a near-conformal dynamics and a compositeness scale near the GUT scale.

Contribution

It introduces a novel composite inflaton model from a four-dimensional gauge theory with non-minimal gravity coupling, highlighting the role of near-conformal dynamics.

Findings

Successful inflation achieved with composite inflaton

Compositeness scale near grand unified energy scale

Near-conformal dynamics preferred for inflation

Abstract

We investigate models in which the inflaton emerges as a composite field of a four dimensional, strongly interacting and nonsupersymmetric gauge theory featuring purely fermionic matter. We show that it is possible to obtain successful inflation via non-minimal coupling to gravity, and that the underlying dynamics is preferred to be near conformal. We discover that the compositeness scale of inflation is of the order of the grand unified energy scale.