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Suppose the non-baryonic dark matter consists entirely of neutrinos. What is the average rest energy of...

Suppose the non-baryonic dark matter consists entirely of neutrinos. What is the average rest energy of the neutrinos that could account for this part of the mass of the universe? As a rough estimate, assume that the neutrino density is the same as the present photon density.

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this is most general expression,it can very according to given condition

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