Inflationary axion cosmology

Details Inflationary axion cosmology Inflationary axion cosmology

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvl..66....5t&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 66, Jan. 7, 1991, p. 5-8. Research supported by DOE and NSF.

Mathematics

Logic

68

Broken Symmetry, Cosmology, Particle Theory, Quantum Chromodynamics, Supersymmetry, Dark Matter, Relic Radiation, String Theory

Scientific paper

If Peccei-Quinn (PQ) symmetry is broken after inflation, the initial axion angle is a random variable on cosmological scales; based on this fact, estimates of the relic-axion mass density give too large a value if the axion mass is less than about 10 to the -6th eV. This bound can be evaded if the universe underwent inflation after PQ-symmetry breaking and if the observable universe happens to be a region where the initial axion angle was atypically small. Consideration of fluctuations induced during inflation severely constrains the latter alternative is shown.

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