Density Perturbations in Multifield Inflationary Models
arXiv:astro-ph/9710038 · doi:10.1016/S0370-2693(98)00032-X
Abstract
We derive a closed-form, analytical expression for the spectrum of long-wavelength density perturbations in inflationary models with two (or more) inflaton degrees of freedom that is valid in the slow-roll approximation. We illustrate several classes of potentials for which this expression reduces to a simple, algebraic expression.
17 pages, revtex, submitted to Phys. Lett. B