Inflationary axion cosmology

Phys. Rev. Lett. 66, 5 – Published 7 January 1991
Michael S. Turner and Frank Wilczek


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 10-6 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, θ1≲[ma/(10-6 eV]0.59.] We show consideration of fluctuations induced during inflation severely constrains the latter alternative.


  • Received 26 September 1990
  • Published in the issue dated 7 January 1991

© 1991 The American Physical Society

Authors & Affiliations

Michael S. Turner

  • NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 an
  • Departments of Physics and Astronomy Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433

Frank Wilczek

  • Institute for Advanced Study, School of Natural Sciences, Princeton, New Jersey 08540

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