An inflation model with large variations in spectral index

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.

98.70.Vc
98.80.Cq
11.10.Kk
inflation
perturbation: scalar
gauge field theory: abelian
dimension: 5
spectrum
cosmic background radiation: anisotropy
numerical calculations: interpretation of experiments

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Figures(0)

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