Single-field inflation in models with an $R^2$ term

Abstract : We present two cases where the addition of the $R^2$ term to an inflationary model leads to single-field inflation instead of two-field inflation as is usually the case. In both cases we find that the effect of the $R^2$ term is to reduce the value of the tensor-to-scalar ratio $r$.
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Submitted on : Tuesday, January 21, 2020 - 9:17:30 PM
Last modification on : Tuesday, February 18, 2020 - 9:16:13 PM

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Ignatios Antoniadis, Alexandros Karam, Angelos Lykkas, Thomas Pappas, Kyriakos Tamvakis. Single-field inflation in models with an $R^2$ term. 19th Hellenic School and Workshops on Elementary Particle Physics and Gravity, Aug 2019, Corfu, Greece. ⟨hal-02447876⟩

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