English

Observational Constraints on Constant Roll Inflation

Cosmology and Nongalactic Astrophysics 2019-05-29 v3 General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory

Abstract

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.

Keywords

Cite

@article{arxiv.1808.01325,
  title  = {Observational Constraints on Constant Roll Inflation},
  author = {Jose T. Galvez Ghersi and Alex Zucca and Andrei V. Frolov},
  journal= {arXiv preprint arXiv:1808.01325},
  year   = {2019}
}

Comments

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

R2 v1 2026-06-23T03:24:06.676Z