Cosmic and local mass density of ``invisible'' axions

Details Cosmic and local mass density of ``invisible'' axions Cosmic and local mass density of ``invisible'' axions

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvd..33..889t&link_type=abstract

Physical Review D (Particles and Fields), Volume 33, Issue 4, 15 February 1986, pp.889-896

Physics

206

Particle-Theory And Field-Theory Models Of The Early Universe, Background Radiations, Observational Cosmology

Scientific paper

If the Universe is axion dominated it may be possible to detect the axions which comprise the bulk of the mass density of the Universe. The feasibility of the proposed experiments depends crucially upon knowing the axion mass (or equivalently, the Peccei-Quinn symmetry-breaking scale) and the local mass density of axions. In an axion-dominated universe our galactic halo should be comprised primarily of axions. We calculate the local halo density to be at least 5×10-25 g cm-3, and at most a factor of 2 larger. Unfortunately, it is not possible to pin down the axion mass, even to within an order of magnitude. In an axion-dominated universe we place an upper limit to the axion mass of about 10-4 eV. We give precise formulas for the axion mass in an axion-dominated universe, and clearly point out all the uncertainties involved in determining the precise value of the mass.

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