On the origin of dark matter axions

Details On the origin of dark matter axions On the origin of dark matter axions

1998-08-20

arxiv.org/abs/astro-ph/9808220v1

Phys.Rept. 307 (1998) 227-234

Astronomy and Astrophysics

Astrophysics

to be published in the proceedings of the 5th IFT Workshop on Axions

Scientific paper

10.1016/S0920-5632(98)00507-6

We discuss the possible sources of dark matter axions in the early universe. In the standard thermal scenario, an axion string network forms at the Peccei-Quinn phase transition $T\sim \fa$ and then radiatively decays into a cosmological background of axions; to be the dark matter, these axions must have a mass $\ma \sim 100 \mu eV$ with specified large uncertainties. An inflationary phase with a reheat temperature below the PQ-scale $T_{reh} \lapp \fa$ can also produce axion strings through quantum fluctuations, provided that the Hubble parameter during inflation is large $H_1 \gapp \fa$; this case again implies a dark matter axion mass $\ma \sim 100 \mu eV$. For a smaller Hubble parameter during inflation $H_1 \lapp \fa$, `anthropic tuning' allows dark matter axions to have any mass in a huge range below $\ma\lapp 1 meV$.

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