A slow-roll forecast for five non-minimally coupled inflation models in the (ns, αs, βs) plane, claiming future CMB missions will exclude quartic Hilltop and some D-brane scenarios.
The Lyth Bound Revisited
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abstract
We investigate the Lyth relationship between the tensor-scalar ratio, r, and the variation of the inflaton field, Delta phi, over the course of inflation. For inflationary models that produce at least 55 e-folds of inflation, there is a correlation between r and Delta phi 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, any inflationary model with r > 10^-3 must have Delta phi > m_pl. Large field variations are therefore required if a tensor mode signal is to be detected in any foreseeable cosmic microwave background (CMB) polarization experiment.
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astro-ph.CO 1years
2025 1verdicts
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What new physics can we extract from inflation using the ACT DR6 and DESI DR2 Observations?
A slow-roll forecast for five non-minimally coupled inflation models in the (ns, αs, βs) plane, claiming future CMB missions will exclude quartic Hilltop and some D-brane scenarios.