Inflaton versus Curvaton in Higher Dimensional Gauge Theories

Understand

We construct a model of cosmological inflation and perturbation based on the higher-dimensional gauge theory.

• The inflaton and curvaton are the scalar fields arising from the extra space components of the gauge field living in more than four dimensions.
• We take the six-dimensional (6D) Yang-Mills theory compactified on $T^2$ as a toy model, and apply the one-loop effective potential of the inflaton and the curvaton to the curvaton scenario.
• We have found that the curvaton is subdominant for the linear curvature perturbation, but that a significant non-Gaussianity and a sizable tensor to scalar ratio are generated.