Constraints on Axion-Lepton coupling from Big Bang Nucleosynthesis
Diptimoy Ghosh, Divya Sachdeva
TL;DR
This paper investigates how the interaction between Axion-Like-Particles and leptons affects Big Bang Nucleosynthesis, establishing new bounds on their coupling strength based on cosmological constraints, especially for specific axion mass ranges.
Contribution
It provides the most stringent cosmological bounds on ALP-electron coupling for axion masses between 20 keV and 1 MeV, complementing other experimental bounds.
Findings
BBN constrains ALP-electron coupling for 20 keV to 1 MeV axion mass.
BBN bounds are more stringent than stellar and laboratory bounds in certain mass ranges.
Cosmological data helps refine limits on ALP properties.
Abstract
In this article, we study the implications of the coupling between Axion-Like-Particles (ALPs) and Leptons to cosmology, in particular, the Big Bang Nucleosynthesis (BBN). We show that the BBN, through the constraint on the effective number of relativistic neutrino species, provides the most stringent bound on the ALP-electron interaction strength for the mass of axion between 20 keV and 1 MeV. For other values of the mass, the BBN bound complements the stellar-evolution and laboratory bounds.
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