We derive the power spectrum Ρ(k) of the density perturbations produced during inflation up to second-order corrections in the standard slow-roll approximation for an inflaton with more than one degree of freedom. We also present the spectral index n up to first-order corrections including previously missing terms, and the running dn/d lnk to leading order.
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 4 Jul 2002|
Bibliographical noteFunding Information:
We thank Hyun-Chul Lee for valuable discussions and helpful comments. This work was supported in part by Brain Korea 21 and KRF grant 2000-015-DP0080.