Simple single-field inflation models with arbitrarily small tensor/scalar ratio
arXiv:2210.05757 · doi:10.1088/1475-7516/2023/03/027
Abstract
We construct a family of simple single-field inflation models consistent with Planck / BICEP Keck bounds which have a parametrically small tensor amplitude and no running of the scalar spectral index. The construction consists of a constant-roll hilltop inflaton potential with the end of inflation left as a free parameter induced by higher-order operators which become dominant late in inflation. This construction directly demonstrates that there is no lower bound on the tensor/scalar ratio for simple single-field inflation models.
14 pages, 2 figures (V3: Version submitted to JCAP)
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- Minimizing the tensor-to-scalar ratio in single-field inflation models
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- A universal bound on the duration of a kination era
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- Gravitational waves in a cyclic Universe: resilience through cycles and vacuum state
- Preheating and gravitational waves in large-field hilltop inflation