An inflation model with large variations in spectral index
Astrophysics
2008-11-26 v2 High Energy Physics - Phenomenology
Abstract
Recent fits of cosmological parameters by the Wilkinson Microwave Anisotropy Probe (WMAP) measurement favor a primordial scalar spectrum with varying index. This result, if stands, could severely constrain inflation model buildings. Most extant slow-roll inflation models allow for only a tiny amount of scale variations in the spectrum. We propose in this paper an extra-dimensional inflation model which is natural theoretically and can generate the required variations of the spectral index as implied by the WMAP for suitable choices of parameters.
Cite
@article{arxiv.astro-ph/0302479,
title = {An inflation model with large variations in spectral index},
author = {Bo Feng and Mingzhe Li and Ren-Jie Zhang and Xinmin Zhang},
journal= {arXiv preprint arXiv:astro-ph/0302479},
year = {2008}
}
Comments
5 pages, 3 figures, REVTeX 4. Comments on low CMB quadrupoles added; Version accepted for publication in Phys. Rev. D