Novel cosmological bounds on thermally-produced axion-like particles

  title={Novel cosmological bounds on thermally-produced axion-like particles},
  author={Luca Caloni and Martina Gerbino and Massimiliano Lattanzi and Luca Visinelli},
  journal={Journal of Cosmology and Astroparticle Physics},
We constrain the coupling of thermally-produced axion-like particles (here axions) with photons and gluons, using data from the cosmic microwave background (CMB) spectra and baryon acoustic oscillations. The axion possesses an explicit soft breaking mass term and it is produced thermally in the early Universe from either axion-photon or axion-gluon processes, accounting for the recent progresses in the field. We derive the most stringent bounds on the axion-gluon coupling to date on the mass… 

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