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Title: Axion Bounds from Precision Cosmology

Depending on their mass, axions produced in the early universe can leave different imprints in cosmic structures. If axions have masses in the eV-range, they contribute a hot dark matter fraction, allowing one to constrain m{sub a} in analogy to neutrinos. In the more favored scenario where axions play the role of cold dark matter and if reheating after inflation does not restore the Peccei-Quinn symmetry, the axion field provides isocurvature fluctuations that are severely constrained by precision cosmology. There remains a small sliver in parameter space where isocurvature fluctuations could still show up in future probes.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4]
  1. Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut), 80805 Muenchen (Germany)
  2. Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C (Denmark)
  3. II. Institut fuer Theoretische Physik, Universitaet Hamburg, 22761 Hamburg (Germany)
  4. Institut fuer Theoretische Teilchenphysik und Kosmologie, RWTH Aachen, 52056 Aachen (Germany)
Publication Date:
OSTI Identifier:
21426573
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1274; Journal Issue: 1; Conference: AXIONS 2010: International conference on the cosmology, astrophysics and particle physics of the axion and the results of recent searches for this hypothetical particle, Gainesville, FL (United States), 15-18 Jan 2010; Other Information: DOI: 10.1063/1.3489559; (c) 2010 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; AXIONS; COSMOLOGY; EV RANGE; FLUCTUATIONS; INFLATIONARY UNIVERSE; MONTE CARLO METHOD; NEUTRINOS; NONLUMINOUS MATTER; REST MASS; SYMMETRY; UNIVERSE BOSONS; CALCULATION METHODS; COSMOLOGICAL MODELS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GOLDSTONE BOSONS; LEPTONS; MASS; MASSLESS PARTICLES; MATHEMATICAL MODELS; MATTER; POSTULATED PARTICLES; VARIATIONS