Contributions to ΔNeff from the dark photon of U(1)T3R

@article{Dutta2020ContributionsT,
  title={Contributions to 
$\Delta$Neff
 from the dark photon of 
U(1)T3R},
  author={Bhaskar Dutta and Sumit Ghosh and Jason Kumar},
  journal={Physical Review D},
  year={2020},
  volume={102}
}
We consider the effect on early Universe cosmology of the dark photon associated with the gauging of $U(1)_{T3R}$, a symmetry group under which only right-handed Standard Model fermions transform non-trivially. We find that cosmological constraints on this scenario are qualitatively much more severe than on other well-studied cases of a new $U(1)$ gauge group, because the dark photon couples to chiral fermions. In particular, the dark photon of $U(1)_{T3R}$ is always produced and equilibrates… 
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