QCD axions and axionlike particles in a two-inflation scenario

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 realised 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.

arXiv comment24 pages, 9 figures

References in corpus (31)

• Planck 2015 results. XIII. Cosmological parameters
• Axion Cosmology
• Axions In String Theory
• Encyclopaedia Inflationaris
• The Low-Energy Frontier of Particle Physics
• WISPy Cold Dark Matter
• BICEP2 / Keck Array VI: Improved Constraints On Cosmology and Foregrounds When Adding 95 GHz Data From Keck Array
• MeV-scale Reheating Temperature and Thermalization of Neutrino Background
• What is the lowest possible reheating temperature?
• The type IIB string axiverse and its low-energy phenomenology
• Axion Miniclusters and Bose Stars
• Axion Cosmology
• Cosmological Constraints on Late-time Entropy Production
• Axion dark matter from topological defects
• Axion Cosmology Revisited
• Non-Linear Axion Dynamics and Formation of Cosmological Pseudo-Solitons
• Production of dark matter axions from collapse of string-wall systems
• Dark Matter Axions Revisited
• The topological susceptibility in finite temperature QCD and axion cosmology
• Update of axion CDM energy density
• Structure Formation and Microlensing with Axion Miniclusters
• Axion cold dark matter in non-standard cosmologies
• Axion dark matter: strings and their cores
• Searching for the QCD Axion with Gravitational Microlensing
• Lattice QCD for Cosmology
• Suppressing the QCD Axion Abundance by Hidden Monopoles
• Inflatable Dark Matter
• The topological susceptibility from grand canonical simulations in the interacting instanton liquid model: chiral phase transition and axion mass
• Anharmonic Evolution of the Cosmic Axion Density Spectrum
• Updated Axion CDM energy density
• Low reheating temperatures in monomial and binomial inflationary potentials

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