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- W2061173893 abstract "We investigate the Lyth bound relating the tensor–scalar ratio, r, to the variation of the inflaton field, Δ, over the course of inflation. For inflationary models that produce at least 55 e-folds of inflation, there is a correlation between r and Δ as anticipated by Lyth, but the scatter around the relationship is huge. However, for inflationary models that satisfy current observational constraints on the scalar spectral index and its first derivative, the Lyth relationship is much tighter. In particular, we find that inflationary models with must have , unless the parameters of the models are finely tuned. Large field variations are generally required if a tensor mode signal is to be detected in any foreseeable cosmic microwave background (CMB) polarization experiment." @default.
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- W2061173893 date "2005-05-13" @default.
- W2061173893 modified "2023-10-18" @default.
- W2061173893 title "The Lyth bound revisited" @default.
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- W2061173893 doi "https://doi.org/10.1088/1475-7516/2005/05/008" @default.
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