Scalar perturbations during multiple field slow-roll inflation

We calculate the scalar gravitational and matter perturbations in the context of slow-roll inflation with multiple scalar fields, that take values on a (curved) manifold, to first order in slow roll. For that purpose a basis for these perturbations determined by the background dynamics is introduced and multiple field slow-roll functions are defined. To obtain analytic solutions to first order, the scalar perturbation modes have to be treated in three different regimes. Consistency of the various approximations fixes their matching times. Multiple field effects in the gravitational potential are due to the rotation of the basis and to the particular solution caused by the coupling to the field perturbation perpendicular to the field velocity. They can contribute even to leading order if the corresponding multiple field slow-roll function is sizable during the last 60 e-folds. The analytical results are illustrated and checked numerically with the example of a quadratic potential. PACS number: 98.80.Cq