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Cosmological bounds to the magnetic moment of heavy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math>neutrinos
The magnetic moment of $\ensuremath{\tau}$ neutrinos in the MeV mass range may be large enough to modify the cosmological freeze-out calculation and determine the $\ensuremath{\tau}$-neutrino relic density. In this paper we reexamine such a possibility. We calculate the evolution and freeze-out of the $\ensuremath{\tau}$-neutrino number density as a function of …