Inflation with very small tensor-to-scalar ratio

2019/12/28 by Koichi Hirano, Hirano, Koichi
Economics, Econometrics and Finance · Physics and Astronomy · #Complex Systems and Time Series Analysis #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Solar and Space Plasma Dynamics

paper · pdf · doi:10.48550/arxiv.1912.12515

openalex publication_date 2019/12/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have investigated inflation models that predict a very small value of the tensor-to-scalar ratio, r. The spectral index n_s, and the tensor-to-scalar ratio r, are strictly constrained by the Planck data. n_s and r are sensitive to the shape and magnitude of the inflaton potential, respectively.The constraints by the Planck 2018 data combined with other cosmological observations are compared with the predictions from the inflation models regarding n_s and r. Furthermore, we discuss the comparison of future tensor-to-scalar ratio data with predictions from the inflation models with a focus on part of the quantum fluctuation origin.

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