On the tensor-to-scalar ratio in large single-field inflation models

preprint2015arXivOpen access

We show that generically the tensor-to-scalar ratio in large single-field inflation scenarios is bounded to be larger than $\mathcal{O}(10^{-3})$ for the spectral index in the range favored by observations.

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On the tensor-to-scalar ratio in large single-field inflation models

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