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Neutrino Cosmology by Sergio Pastor, Gianpiero Mangano, Gennaro Miele, Julien Lesgourgues

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4

Neutrinos in the MeV age

Why me? Why now? These are the kind of questions that cosmological neutrinos could ask themselves about the strange coincidence of relevant facts at the MeV range of temperatures. The four known forces of Nature all play a role in this very interesting epoch. When the universe was from one-tenth of a second to a few minutes old, neutrinos experienced decoupling from electromagnetic plasma while flavour neutrino oscillations became effective, and they witnessed electron–positron annihilations and in the meantime were involved in the business of fixing the initial conditions for the primordial production of light nuclei. All these processes, which in principle could have occurred in the early universe well separated ...

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