New matter effects and BBN constraints for mass-varying neutrinos

@article{Weiner2006NewME,
  title={New matter effects and BBN constraints for mass-varying neutrinos},
  author={Neal Weiner and Kathryn M. Zurek},
  journal={Physical Review D},
  year={2006},
  volume={74},
  pages={023517}
}
The presence of light (mA � 10 6 eV) scalar fields in the early universe can modify the cosmology of neutrinos considerably by allowing their masses to vary on cosmological times. In this paper, we consider the effect of Planck-suppressed couplings of this scalar to electrons and show that such couplings can easily make new sterile states thermally inaccessible in the early universe, preserving the successes of big bang nucleosynthesis predictions. We consider the circumstances under which… Expand
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