Spin-Flavor oscillations of cosmic neutrino flux in intergalactic magnetic field

Neutrinos may possess tiny magnetic moments (μν) via quantum corrections, by virtue of which they can undergo spin-flavor oscillations. This phenomenon can alter the flux of cosmic neutrinos. Considering the current limit on μν we show that the flux of cosmic neutrinos will reduce by half if they traverse a few Mpcs through the intergalactic magnetic field, in the range of μ G to nG. Furthermore, if the current upper bound is improved by a few orders of magnitude, the effect of μν can be safely neglected, even if the neutrinos travel through the size of the visible universe.