QCD axions and axionlike particles in a two-inflation scenario

2017/09/30 by Sebastian Hoof, Joerg Jaeckel
Physics and Astronomy · #Axion #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Inflation (cosmology) #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Physics #Quantum chromodynamics #Quantum electrodynamics #Strong CP problem #Theoretical physics #astro-ph.CO #hep-ph

paper · pdf · doi:10.1103/physrevd.96.115016

published as Phys. Rev. D 96, 115016 (2017) · 24 pages, 9 figures

openalex publication_date 2017/12/20 · arxiv created 2017/12/21 · arxiv updated 2017/12/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate the phenomenology of QCD axions and axionlike particles in a scenario with two eras of inflation. In particular, we describe the possible solutions for the QCD axion field equation after the second inflation and reheating. We calculate the dilution numerically for QCD axions and give an analytic approximation for axionlike particles. While it has been realized before that such a scenario can dilute the axion energy density and open up the parameter space for the axion decay constant f_A, we find that even a small increase in the relative QCD axion energy density is possible.

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