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In this paper we study gauged M-flation, an inflationary model in which inflation is driven by three $N\times N$ scalar field matrices in the adjoint representation of $U(N)$ gauge group. We focus our study on the gauged M-flation model which could be derived from the dynamics of a stack of D3-branes in appropriate background flux. The background inflationary dynamics is unaltered compared to the ungauged case of \cite{Ashoorioon:2009wa}, while the
the spectrum of ``spectator species'', the isocurvature modes, differs from the ungauged case. Presence of a large number of spectators, although irrelevant to the slow-roll inflationary dynamics has been argued to lower the effective UV cutoff $\Lambda$ of the theory from the Planck mass $\mpl$, invalidating the main advantage of M-flation in not having super-Planckian field values and unnaturally small couplings. Through a careful analysis of the spectrum of the spectators we argue that, contrary to what happens in N-flation models, M-flation is still UV safe with the modified (reduced) effective UV cutoff $\Lambda$, which we show to be of order $(0.5-1)\times 10^{-1}\mpl$.
Moreover, we argue that the string scale in our gauged M-flation model is larger than $\Lambda$ by a factor of $10$ and hence one can also neglect stringy effects. We also comment on the stability of classical inflationary paths in the gauged M-flation.
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