Abstract
The amplification of a seed cosmological magnetic field (CMF) in a hot electroweak plasma of early Universe driven by neutrino degeneracy (asymmetry) is provided by a lower bound on such asymmetries that is in agreement with the known upper (BBN) bound on the electron neutrino asymmetry. Independently of a mechanism for CMF generation one predicts a stringent upper bound on the Dirac neutrino magnetic moment using the lower bound on CMF amplitude found from the Fermi satellite experiment.
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