2018/08/31 by José T. Gálvez Ghersi, Jose T. Galvez Ghersi, Alex Zucca +1 · 31 citations
Physics and Astronomy · #Anisotropy #Astronomy and Astrophysical Research #Cosmic background radiation #Cosmic microwave background #Cosmological perturbation theory #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Parameter space #Perturbation (astronomy) #Planck #Slow roll #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2019/05/030
published in Journal of Cosmology and Astroparticle Physics 2019(05), 030 (Institute of Physics) · REVTeX 4.1. 9 pages, 8 figures, Typos fixed, Improved definitions and discussion on parameter degeneracies in the slow-roll limit. Matches the version approved for publication in JCAP
openalex created_date 2018/08/22 · arxiv created 2019/05/08 · openalex publication_date 2019/05/20 · arxiv updated 2019/05/29 · openalex updated_date 2026/08/05
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.