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New Bounds on Heavy QCD Axions from Big Bang Nucleosynthesis
cosmology-and-nongalactic-astrophysicshigh-energy-physics-experimenthigh-energy-physics-phenomenologynuclear-experiment
We study Big Bang Nucleosynthesis (BBN) constraints on heavy QCD axions. BBN offers a powerful probe of new physics that modifies the neutron-to-proton ratio during the process, thanks to the precisely measured primordial Helium-4 abundance. A heavy QCD axion provides an attractive target for this p
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