- Mar 17, 2015
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Yes, I was just reading yesterday an article I'd not read about trying to reconcile the many seeming contradictory observations (as laid out in the article) by using some newer ideas, including a solution by theorizing heavier new kinds of neutrino (which is dark matter, then). See link in recent post above.In this context the primordial cosmic neutrinos are slow.
Since neutrinos are now known to carry mass their kinetic energies depend on temperature.
The theoretical cosmic neutrino background is around 2K and it's possible they now travel at non relativistic speeds.
As a result they have extremely low energies, lower than solar neutrinos and are beyond the range of our current neutrino detectors.
As a far as being a possible constituent of dark matter the same problems apply; in the early universe the kinetic energy of the cosmic neutrinos was too high for the neutrinos to clump and cannot explain the rotation curves of spiral galaxies which require the clumping or concentration of dark matter.
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