Axion Bounds from Precision Cosmology

Journal Article · Mon Aug 30 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3489559· OSTI ID:21426573

Raffelt, G G ^[1]; Hamann, J; Hannestad, S ^[2]; Mirizzi, A ^[3]; Wong, Y Y. Y. ^[4]

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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)

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.

• OSTI ID: 21426573
• Journal Information: AIP Conference Proceedings, Vol. 1274, 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; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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FLUCTUATIONS
INFLATIONARY UNIVERSE
MONTE CARLO METHOD
NEUTRINOS
NONLUMINOUS MATTER
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