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Barenboim, G.; Vives, O.
Physics letters. B, 09/2015, Letnik: 748, Številka: CJournal Article
In this work, we show that, in the presence of non-minimal coupling to gravity, it is possible to generate sizeable tensor modes in single-field models without transplanckian field values. These transplanckian field values apparently needed in Einstein gravity to accommodate the experimental results may only be due to our insistence of imposing a minimal coupling of the inflaton field to gravity in a model with non-minimal couplings. We present three simple single-field models that prove that it is possible to accommodate a large tensor-to-scalar ratio without requiring transplanckian field values within the slow-roll regime.
