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QCD axions and axionlike particles in a two-inflation scenario

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arxiv 1709.01090 v2 pith:AJSMHD7O submitted 2017-09-04 hep-ph astro-ph.CO

Sebastian Hoof , Joerg Jaeckel This is my paper · ORCID
classification hep-phastro-ph.CO
keywords axionaxionlikeaxionsparticlesscenariodensityenergyinflation
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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.

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