  We investigate cosmological inflationary scenarios from a
gravitoelectromagnetic theory. Our work is formulated in the light of a
recently introduced geometrical Weyl-Invariant scalar-tensor theory of gravity,
where the nature of both the electromagnetic potential and the inflaton field
is attributed to the space-time geometry. We obtain a Harrison-Zeldovich power
spectrum for quantum fluctuations of the inflaton field. In our model the
electromagnetic fields have also a nearly scale invariant power spectrum for a
power-law inflation. We found that the the seed magnetic fields have a nearly
scale invariant power spectrum and generate in the present times cosmic
magnetic fields of the order $\lesssim 10^{9}$ gauss, in good agreement with
CMB observations.
