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Temperature distribution of neutrino background radiation

  1. Feb 5, 2012 #1

    I wonder - is the CνB energy curve expected to follow the Boltzmann distribution?
    In the 2 seconds neutrinos were in equilibrium with matter, did they bounce off enough to even out the energy?

    I'm asking because a back-of-envelope computation gives cosmic neutrino speeds of ~0.09c, whereas neutrinos from solar events, geoneutrinos, supernovas etc. travel so close to c we can't distinguish them.

    So is there a clear distinction, CνB radiation is slow, and modern neutrinos are fast?
  2. jcsd
  3. Feb 6, 2012 #2
    Don't you need to know the rest mass of the neutrino to solve for its velocity?
  4. Feb 6, 2012 #3


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    You're probably right. Today neutrinos can go a long time without interacting with anything.
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