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Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for Their Detection
1Illinois Center for Advanced Studies of the Universe and Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA.
Abstract:
Since decoupling in the early Universe in helicity states, primordial neutrinos propagating in astrophysical magnetic fields precess and undergo helicity changes. In view of various experimental bounds allowing a large magnetic moment of neutrinos, we estimate the helicity flipping for relic neutrinos in both cosmic and galactic magnetic fields. The flipping probability is sensitive both to the neutrino magnetic moment and the structure of the magnetic fields and is a potential probe of the fields. As we find, even a magnetic moment well below that suggested by XENON1T could significantly affect relic neutrino helicities and their detection rate via inverse tritium beta decay.
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