QCD Axion Dark Matter with a Small Decay Constant

Raymond T. Co; Lawrence J. Hall; Keisuke Harigaya

doi:10.1103/PhysRevLett.120.211602

QCD Axion Dark Matter with a Small Decay Constant

Raymond T. Co, Lawrence J. Hall, Keisuke Harigaya

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86 Scopus citations

Abstract

The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant fa∼O(1011) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires fa∼(108-1011) GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.

Original language	English (US)
Article number	211602
Journal	Physical review letters
Volume	120
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.120.211602
State	Published - May 23 2018
Externally published	Yes

Bibliographical note

Funding Information:
This work was supported in part by the Director, Office of Science, Office of High Energy and Nuclear Physics, of the U.S. Department of Energy under Contract No.DE-AC02-05CH11231 and by the National Science Foundation under Grants No.PHY-1316783 and No.PHY-1521446.

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© 2018 authors. Published by the American Physical Society.

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abstract = "The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant fa∼O(1011) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires fa∼(108-1011) GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.",

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N2 - The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant fa∼O(1011) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires fa∼(108-1011) GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.

AB - The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant fa∼O(1011) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires fa∼(108-1011) GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.

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QCD Axion Dark Matter with a Small Decay Constant

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