An inflation model with large variations in spectral index

Details An inflation model with large variations in spectral index An inflation model with large variations in spectral index

2003-02-24

arxiv.org/abs/astro-ph/0302479v2

Phys.Rev.D68:103511,2003

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, REVTeX 4. Comments on low CMB quadrupoles added; Version accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.68.103511

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.

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