Abstract
We explore the cosmological consequences of kinetically mixed dark photons with a mass between 1 MeV and 10 GeV and an effective electromagnetic fine structure constant as small as . We calculate the freeze-in abundance of these dark photons in the early universe and explore the impact of late decays on big bang nucleosynthesis and the cosmic microwave background. This leads to new constraints on the parameter space of mass vs kinetic mixing parameter .
4 More- Received 10 July 2014
DOI:https://doi.org/10.1103/PhysRevD.90.035022
© 2014 American Physical Society