publication . Article . Preprint . 2019

Axion absorption and the spin temperature of primordial hydrogen

Auriol, Adrien; Davidson, Sacha; Raffelt, Georg;
Open Access English
  • Published: 24 Jan 2019
  • Publisher: HAL CCSD
An absorption dip in the spectrum of the cosmic microwave background observed by the EDGES experiment suggests an unexplained reduction of the hydrogen spin temperature at cosmic redshift z ~ 17. The mass of dark-matter axions could correspond to the hyperfine splitting of 5.9 micro-eV, between the triplet (H1) and singlet (H0) state. We calculate the rate for a+ H0 <-> H1 in two ways, and find that it is orders of magnitude smaller than the CMB-mediated transition rate, so irrelevant. As a result, this process cannot be used to rule in or out dark matter axions of mass = hyperfine splitting. The axion rate nonetheless has interesting features, for example, on b...
arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics and Astronomy (miscellaneous), Atomic physics, Axion, Spin-½, COSMIC cancer database, Hyperfine structure, Singlet state, Quantum electrodynamics, Physics, Cosmic microwave background, Redshift, Hydrogen, chemistry.chemical_element, chemistry
Funded by
The Elusives Enterprise: Asymmetries of the Invisible Universe
  • Funder: European Commission (EC)
  • Project Code: 674896
  • Funding stream: H2020 | MSCA-ITN-ETN
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