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Title: Inflationary axion cosmology

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.
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Publication Date:
OSTI Identifier:OSTI ID: 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