Section \[sec:model\] we introduce the model and review the background analysis, mostly summarizing the analogous computation of [@Maleknejad:2011jw]. In Section \[sec:linpert\] we present our formalism for the perturbations. Specifically, we discuss at the formal level how we fix the gauge freedom, integrate out the non-dynamical modes, and quantize the early time action, to obtain the initial condition for the perturbations. The explicit computations for the model are presented in Section \[sec:tensor\] for the tensor perturbations, and in Section \[sec:scalar\] for the scalar modes. In Section \[sec:pheno\] we study the phenomenological implications of these results. In Section \[sec:comparison\] we compare our computation with that of [@Maleknejad:2011jw]. Finally, in the concluding Section \[sec:conclusions\] we summarize our findings, and compare them with those in Chromo-natural inflation.

The model, the background solution, and the slow roll approximation {#sec:model}
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The “matter” Lagrangian of Gauge-flation, see eq. (\[oneeq\]), consists of a standard Yang-Mills term and of a gauge-invariant contribution of the form $(F\tilde{F})^{2}$ ($\tilde{F}$ being the dual field-strength tensor). Due to the SU(2) gauge symmetry, the theory admits a rotationally invariant vev for the SU(2) multiplet, specified by eq. ([\[gF\]]{}), which is compatible with an isotropic background. We choose an FRW background metric [^4] $$\label{s2one}
