Gravitational waves from spectator Gauge-flation

Abstract We investigate the viability of inflation with a spectator sector comprised non-Abelian gauge fields coupled through higher order operator. dub this model “spectator Gauge-flation”. study predictions for amplitude and tensor tilt chiral gravitational waves conclude that slightly red-tilted power spectrum is preferred . As related models, enhancement respect to single-field vacuum wave background controlled by parameter ?=g 2 Q /H , where g coupling, H Hubble scale VEV SU(2) sector. The requirement leads maximum allowed value ?, thereby constraining possible amplification. In provide concrete predictions, we use an ?-attractor T-model potential inflaton Potential observation significantly tilted spectra would then indicate presence additional couplings axions, like in axion-SU(2) model, or field operators.