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Simple single-field inflation models with arbitrarily small tensor/scalar ratio

Nina K. Stein William H. Kinney
Oct 2022
摘要
We construct a family of simple single-field inflation models consistent withPlanck / BICEP Keck bounds which have a parametrically small tensor amplitudeand no running of the scalar spectral index. The construction consists of aconstant-roll hilltop inflaton potential with the end of inflation left as afree parameter induced by higher-order operators which become dominant late ininflation. This construction directly demonstrates that there is no lower boundon the tensor/scalar ratio for simple single-field inflation models.
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