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
Abstract
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...
Subjects
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
EC| ELUSIVES
Project
ELUSIVES
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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