Natural inflation with exponentially small tensor-to-scalar ratio
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DOI: 10.1103/physrevd.110.l061302
Abstract: We demonstrate that"natural inflation", also known as"axion inflation", can be compatible with Planck 2018 measurements of the cosmic microwave background, while predicting an exponentially small tensor-to-scalar ratio, e.g., $r\sim 10^{-15}$. The strong suppression of $r$… read more here.
Keywords: scalar ratio; inflation; natural inflation; tensor scalar ... See more keywords