Density Perturbations in Multifield Inflationary Models

Astronomy and Astrophysics – Astrophysics

Scientific paper

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17 pages, revtex, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)00032-X

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.

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