The cold axion populations

Details The cold axion populations The cold axion populations

1998-12-10

arxiv.org/abs/hep-ph/9812327v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 12 figures, invited talk at the Dark98 Conference, Heidelberg, Germany, July 20-25, 1998

Scientific paper

We give a systematic discussion of the contributions to the cosmological energy density in axions from vacuum realignment, string decay and wall decay. We call these the cold axion populations because their kinetic energy per particle is at all times much less than the ambient temperature. In case there is no inflation after the Peccei-Quinn phase transition, the value of the axion mass for which axions contribute the critical energy density for closure is estimated to be of order $6 \cdot 10^{-6}$ eV, with large uncertainties. It is emphasized that there are two groups of cold axions differing in velocity dispersion by a factor of order $10^3$.

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