Generating zeta with non-Abelian Vector Fields

TL;DR

This paper explores how non-Abelian vector fields can generate primordial curvature perturbations, highlighting their non-Gaussian features and compatibility with observational constraints.

Contribution

It demonstrates that non-Abelian vector fields can produce the total curvature perturbation without conflicting with observational data, emphasizing superhorizon evolution effects.

Findings

Non-Gaussianity dominated by superhorizon evolution.

Non-Abelian vector fields can generate the full curvature perturbation.

Models remain consistent with observational constraints.

Abstract

In this paper the generation of the primordial curvature perturbation by vector fields of general non-Abelian groups is discussed. We show that non-Gaussianity of the perturbation is dominated by contributions from superhorizon evolution of fields. Also we find that non-Abelian vector fields of reasonably large groups can generate the total of the curvature perturbation without violating observational constraints on the angular modulation of the spectrum.