Consequences of neutrino self-interactions for weak decoupling and big bang nucleosynthesis

  title={Consequences of neutrino self-interactions for weak decoupling and big bang nucleosynthesis},
  author={Evan B. Grohs and George M. Fuller and Manibrata Sen},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
We calculate and discuss the implications of neutrino self-interactions for the physics of weak decoupling and big bang nucleosynthesis (BBN) in the early universe. In such neutrino-sector extensions of the standard model, neutrinos may not free-stream, yet can stay thermally coupled to one another. Nevertheless, the neutrinos exchange energy and entropy with the photon, electron-positron, and baryon component of the early universe only through the ordinary weak interaction. We examine the… Expand

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