Inflationary perturbations with multiple scalar fields

摘要: The calculation of scalar gravitational and matter perturbations during multiple-field inflation valid to first order in slow roll is discussed. These fields may be the coordinates a non-trivial field manifold hence have nonminimal kinetic terms. A basis for these determined by background dynamics introduced, slow-roll functions are generalized case. Solutions perturbation mode its three different behavioural regimes combined, leading an analytic expression correlator potential. Multiple-field effects caused coupling perpendicular velocity can even contribute at order. This illustrated numerically with example quadratic (The material here based on previous work authors presented hep-ph/0107272.)