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Novel cosmological bounds on thermally-produced axion-like particles

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arxiv 2205.01637 v2 pith:7IDCTTV4 submitted 2022-05-03 astro-ph.CO hep-ph

Luca Caloni , Martina Gerbino , Massimiliano Lattanzi , Luca Visinelli This is my paper
classification astro-ph.COhep-ph
keywords boundscouplingmassaxionaxion-gluonaxion-likeaxion-photonlesssim
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abstract

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 range considered $10^{-4} \lesssim m_a/{\rm eV} \lesssim 100$, superseding the current bounds from SN1987A. The bounds on the axion-photon coupling are competitive with the results from the CAST collaboration for the axion mass $m_a \gtrsim 3\,$eV. We comment on the forecast reaches that will be available given the sensitivity of future CMB-S4 missions.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. MeV Electrophilic Axion-like Particles from Sun

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