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Title: Inflationary axion cosmology

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{sup {minus}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, {theta}{sub 1}{approx lt}({ital m}{sub {ital a}}/10{sup {minus}6} eV{sup 0.59}.) We show consideration of fluctuations induced during inflation severely constrains the latter alternative.
Authors:
 [1] ;  [2]
  1. (NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 an (US) Departments of Physics and Astronomy Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago, IL (USA))
  2. (Institute for Advanced Study, School of Natural Sciences, Princeton, New Jersey (USA))
Publication Date:
OSTI Identifier:
6099352
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; (USA); Journal Volume: 66:1
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AXIONS; MASS; COSMOLOGY; INFLATIONARY UNIVERSE; GOLDSTONE BOSONS; LIMITING VALUES; PHASE TRANSFORMATIONS; QUANTUM CHROMODYNAMICS; SCALAR FIELDS; SYMMETRY BREAKING; BOSONS; COSMOLOGICAL MODELS; ELEMENTARY PARTICLES; FIELD THEORIES; MATHEMATICAL MODELS; POSTULATED PARTICLES; QUANTUM FIELD THEORY 640106* -- Astrophysics & Cosmology-- Cosmology; 645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties