Can galactic halos be made of axions

Details Can galactic halos be made of axions Can galactic halos be made of axions

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrvl..50..925i&link_type=abstract

Physical Review Letters, vol. 50, Mar. 21, 1983, p. 925-927. Research supported by the U.S. Department of Energy and NSF.

Physics

84

Cosmology, Galactic Structure, Halos, Particle Theory, Spiral Galaxies, Weak Interactions (Field Theory), Neutrinos, Particle Flux Density

Scientific paper

If axions exist, they contribute significantly to the present energy density. These axions have been collisionless and nonrelativistic since their appearance at approximately 1 GeV. Hence axion density perturbations survive on essentially all scales, and once the axions are dominant, grow and in turn create and amplify baryon fluctuations. Axions can cluster into galactic halos even though the axion mass is not greater than approximately 0.01 eV. If galactic halo matter is mainly axions, the Peccei-Quinn order parameter not less than approximately 10 to the 10th GeV.

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