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arxiv: 1808.01325 · v3 · pith:MCHRUUCQnew · submitted 2018-08-03 · 🌌 astro-ph.CO · gr-qc· hep-ph· hep-th

Observational Constraints on Constant Roll Inflation

classification 🌌 astro-ph.CO gr-qchep-phhep-th
keywords inflationbackgroundconstant-rollconstraintsmodelslow-rollaccurateallowed
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Constant-roll inflation was recently introduced by Motohashi, Starobinsky and Yokoyama as a phenomenological way to parametrize deviations from the slow-roll scenarios. In this paper, we investigate the dynamics of both the background and the perturbations in this model, without making any slow-roll assumptions. The perturbation spectra are computed with an efficient and accurate novel method that allowed us to quickly scan the parameter space of constant-roll inflation. We derive the constraints on the model parameters from the cosmic microwave background anisotropy measurements provided by the joint analysis of the Planck Collaboration and the BICEP2/Keck Array data.

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