Inflation from multiple flat directions

We illustrate an example where multiple flat directions give rise to inflation with a help of non-minimal kinetic terms. We show that multiple fields can assist inflation irrespective of the field potentials which are expected to be lifted in the early Universe. We argue that inflation may proceed in this set-up even if individual potentials are too steep to sustain inflation on their own. We calculate the density perturbations and the spectral index, we find that the spectral index is closer to scale invariance than the spectrum that any individual field would generate.