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Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection

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arxiv 2012.12421 v3 pith:JUH5UI25 submitted 2020-12-22 hep-ph astro-ph.COhep-exnucl-th

Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection

Gordon Baym , Jen-Chieh Peng This is my paper
classification hep-ph astro-ph.COhep-exnucl-th
keywords magneticfieldshelicitymomentneutrinoneutrinosastrophysicaldetection
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Since decoupling in the early universe in helicity states, primordial neutrinos propagating in astrophysical magnetic fields precess and undergo helicity changes. In view of the XENON1T experiment possibly finding a large magnetic moment of solar 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, thus potentially a 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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  1. Pathways and impediments towards a detection of the relic neutrino wind

    hep-ph 2026-07 accept novelty 6.0

    Detecting the cosmic neutrino background's dipole anisotropy via tritium capture requires ~10^5 times the exposure needed for flux detection, with Majorana neutrinos suffering an additional (m_ν/T_ν)^2 suppression.