Generating zeta with non-Abelian Vector Fields
  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. 
Mindaugas Karciauskas
astro-ph.CO gr-qc hep-ph hep-th