Constraints on Axion-Lepton coupling from Big Bang Nucleosynthesis
Diptimoy Ghosh, Divya Sachdeva
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.
Topics & Concepts
PhysicsBig Bang nucleosynthesisNucleosynthesisAxionParticle physicsNeutrinoCoupling (piping)LeptonNuclear physicsLepton numberCosmologyUpper and lower boundsBig Bang (financial markets)Bound stateConstraint (computer-aided design)Elementary particleFermionCoupling strengthStandard Model (mathematical formulation)Neutrino oscillationDark matterUniversePhysics beyond the Standard ModelParticle physics theoretical and experimental studiesDark Matter and Cosmic PhenomenaComputational Physics and Python Applications