Inflationary axion cosmology
Journal Article
·
· Physical Review Letters; (USA)
- 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)
- Institute for Advanced Study, School of Natural Sciences, Princeton, New Jersey (USA)
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.
- OSTI ID:
- 6099352
- Journal Information:
- Physical Review Letters; (USA), Vol. 66:1; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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AXIONS
MASS
COSMOLOGY
INFLATIONARY UNIVERSE
GOLDSTONE BOSONS
LIMITING VALUES
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
SCALAR FIELDS
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BOSONS
COSMOLOGICAL MODELS
ELEMENTARY PARTICLES
FIELD THEORIES
MATHEMATICAL MODELS
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QUANTUM FIELD THEORY
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