Cosmological constraints on sub-GeV dark vectors
Date
2020-04-21
Authors
Coffey, John
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Abstract
The purpose of this thesis is to recognize the effects of electromagnetic energy
injection into the early Universe from decaying sub-GeV dark vectors. Decay widths
and energy spectra for the most prominent channels in the sub-GeV region are calculated
for various dark vector models. The models include the kinetic mixing of the
dark photon with the Standard Model photon, U(1)_A' , a dark vector boson which
couples to the baryon minus the lepton current, U(1)_B-L, and the last three are
dark vector bosons which couple one lepton's current minus a different lepton's current,
U(1)_Li-Lj where i != j = e, mu, tau . Measurements from Big Bang Nucleosynthesis
and the Cosmic Microwave Background are used to constrain the lifetime, mass and
coupling constant of the dark vectors.
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Keywords
Big Bang Nucleosynthesis, Cosmic Microwave Background, dark vectors, sub-GeV, Cosmological Constraints