期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/05/021
关键词
axions; cosmological parameters from CMBR; cosmological parameters from LSS; dark matter theory
资金
- Excellence Initiative of the German Federal and State Governments at Heidelberg University
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [674896]
- Heidelberg Karlsruhe Research Partnership (HEiKA)
We assume that dark matter is comprised of axion-like particles (ALPs) generated by the realignment mechanism in the post-inflationary scenario. This leads to isocurvature fluctuations with an amplitude of order one for scales comparable to the horizon at the time when the ALP field starts oscillating. The power spectrum of these fluctuations is flat for small wave numbers, extending to scales relevant for cosmological observables. Denoting the relative isocurvature amplitude at kappa(*), = 0.05 Mpc(-1) by f(iso), Planck observations of the cosmic microwave background (CMB) yield f(iso) < 0.31 at the 2 sigma-level. This excludes the hypothesis of post-inflationary ALP dark matter with masses m(a) < 10(-20)-10(-16)eV, where the range is due to details of the ALP mass-temperature dependence. Future CMB stage IV and 21-cm intensity mapping experiments may improve these limits by 1-2 orders of magnitude in m(a).
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